Boiler Frequently Asked Questions

Choosing, replacing or repairing a boiler can raise many questions.

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Homeowners often need to understand:

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• Which type of boiler is suitable.

• How much a new boiler might cost.

• How long installation takes.

• Whether the existing boiler can be moved.

• What a manufacturer warranty covers.

• How frequently a boiler needs servicing.

• What qualifications an installer should hold.

• Whether the heating system needs to be redesigned.

• How APN Boilers helps homeowners find suitable installers.

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The following frequently asked questions provide straightforward guidance for homeowners considering boiler or central-heating work.

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About APN Boilers

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What is APN Boilers?

APN Boilers is part of APN Home and the wider Architectural Partner Network.

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APN Home Limited operates APN Boilers as a homeowner-facing boiler and heating service.

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The purpose of APN Boilers is to help homeowners find suitable boiler installers and heating professionals for work including:

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• New boiler installation.

• Boiler replacement.

• Boiler servicing.

• Boiler repairs.

• Boiler relocation.

• Central-heating installation.

• Heating controls.

• Radiators.

• Hot-water cylinders.

• Heat pumps.

• Gas, oil, LPG and electric heating systems.

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APN Boilers operates nationwide, although installer availability will vary by location and the type of work required.

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Is APN Boilers the company that installs my boiler?

 

APN Boilers operates as a network and introduction service.

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The installation, servicing or repair work is normally carried out by the independent boiler installer or heating company selected and instructed by the homeowner.

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The installer providing the quotation is responsible for:

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• Surveying the property.

• Recommending the boiler or heating system.

• Preparing the quotation.

• Carrying out the work.

• Complying with the relevant regulations.

• Commissioning the installation.

• Registering the boiler warranty.

• Providing certificates and documentation.

• Providing workmanship cover and aftercare.

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The homeowner should review and accept the installer’s quotation before work begins.

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How does APN Boilers work?

 

The basic process is:

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1. Tell APN what boiler or heating work you require.

2. Provide the property postcode and basic system details.

3. APN reviews the enquiry.

4. Suitable installers covering the area may be identified.

5. An installer contacts the homeowner.

6. The property and heating system are assessed.

7. The installer provides a quotation.

8. The homeowner decides whether to proceed.

9. The installer completes and commissions the work.

10. The homeowner receives the relevant warranty and compliance documents.

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There is no obligation to accept a quotation simply because an introduction has been made.

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Does APN Boilers operate throughout the UK?

 

APN Boilers is intended as a nationwide homeowner service.

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Coverage depends on:

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• The property location.

• The service required.

• Fuel type.

• Installer availability.

• The complexity of the heating system.

• Whether specialist qualifications are required.

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Some installers may cover a single town, while others work across several counties.

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Does APN charge homeowners to make an enquiry?

 

Homeowners can normally submit an initial enquiry without committing to an installation.

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Any call-out fee, diagnostic charge, survey fee or design fee should be confirmed by the individual installer before an appointment is arranged.

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Charges may apply for:

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• Emergency boiler attendance.

• Detailed fault diagnosis.

• Commercial heating surveys.

• Heat-loss calculations.

• Specialist heating-system design.

• Travel outside the installer’s normal coverage area.

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Choosing a New Boiler

 

What type of boiler do I need?

The main domestic boiler types are:

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• Combi boilers.

• System boilers.

• Regular or heat-only boilers.

• Electric boilers.

• Oil boilers.

• LPG boilers.

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The correct boiler will depend on:

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• The size of the property.

• The number of bathrooms.

• Hot-water demand.

• Water pressure and flow.

• Existing pipework.

• Radiator requirements.

• Existing cylinders and storage tanks.

• Available fuel.

• Proposed boiler location.

• Heating controls.

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A professional installer should assess the complete property before recommending a boiler.

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What is a combi boiler?

A combi boiler provides heating and hot water directly from one appliance.

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It does not normally require:

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• A separate hot-water cylinder.

• A cold-water storage tank.

• A feed-and-expansion tank.

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Combi boilers are popular in smaller and medium-sized homes because they save space and provide hot water on demand.

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However, their performance depends on the incoming mains-water pressure and flow rate.

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A combi boiler may not be the best choice for a large house with several bathrooms likely to be used simultaneously.

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What is a system boiler?

A system boiler provides heating and works with a separate hot-water cylinder.

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Many of the heating components are built into the boiler, but stored hot water is retained for bathrooms and other outlets.

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System boilers can be suitable for:

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• Larger homes.

• Properties with several bathrooms.

• Households with higher hot-water demand.

• Homes using an unvented hot-water cylinder.

• Properties where several outlets may be used at once.

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What is a regular or heat-only boiler?

A regular boiler, sometimes called a conventional or heat-only boiler, normally works with:

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• A hot-water cylinder.

• A cold-water storage tank.

• A feed-and-expansion tank.

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This type of system is commonly found in older properties.

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A regular boiler can remain suitable where:

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• The existing heating system is in good condition.

• Water pressure is relatively low.

• The property has several bathrooms.

• The existing pipework arrangement is difficult to convert.

• The homeowner wants to retain stored hot water.

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Is a combi boiler always the best choice?

No.

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A combi boiler can be an excellent option, but it is not automatically suitable for every property.

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Before recommending a combi boiler, the installer should check:

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• Mains-water pressure.

• Mains-water flow rate.

• Number of bathrooms.

• Simultaneous hot-water demand.

• Property size.

• Existing pipework.

• Household requirements.

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A large combi boiler cannot deliver more water than the incoming water main can provide.

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A system boiler and hot-water cylinder may offer better performance in a larger home.

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What size boiler do I need?

Boiler size should be based on the heating and hot-water requirements of the property.

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Factors include:

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• Property heat loss.

• Floor area.

• Insulation.

• Number and size of radiators.

• Number of bathrooms.

• Hot-water demand.

• Existing pipework.

• Boiler type.

• Future extensions or alterations.

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A boiler should not be selected simply by copying the output of the appliance being removed.

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The old boiler may be oversized, undersized or no longer appropriate for the property.

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Is a bigger boiler better?

Not necessarily.

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An oversized boiler may:

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• Switch on and off too frequently.

• Operate inefficiently.

• Create unnecessary noise.

• Cause greater component wear.

• Be difficult to control at lower heating demands.

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An undersized boiler may struggle to heat the property or provide adequate hot water.

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The aim is to install a correctly sized boiler that can operate efficiently across a range of heating demands.

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Which boiler brand is best?

There is no single boiler brand that is best for every home.

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The choice should consider:

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• Suitability for the property.

• Installer experience with the brand.

• Warranty terms.

• Availability of replacement parts.

• Manufacturer support.

• Controls.

• Hot-water performance.

• Boiler dimensions.

• Flue options.

• Purchase and installation cost.

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A suitable boiler installed well is normally a better choice than a premium boiler installed badly.

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Boiler Installation

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How long does it take to install a new boiler?

A straightforward boiler replacement in the same location can often be completed within one working day.

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Typical installation times are:

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• Direct boiler replacement: four to eight hours.

• Replacement with minor alterations: one day.

• Conversion to a combi boiler: one to two days.

• Boiler relocation: one to two days.

• Boiler and cylinder replacement: one to two days.

• Complete central-heating installation: three to five days or longer.

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The actual timescale depends on the pipework, flue, controls, gas supply and condition of the existing system.

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Can a boiler be installed in the same position?

In many cases, yes.

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Keeping the boiler in the same position is normally the simplest and least expensive option.

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The installer must still confirm that:

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• The location remains compliant.

• The flue position is suitable.

• The boiler can be serviced safely.

• The gas supply is adequate.

• Condensate drainage is available.

• Required clearances can be maintained.

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Can a boiler be moved?

Yes, subject to the proposed location being suitable.

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A boiler can often be relocated to:

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• A utility room.

• Garage.

• Loft.

• Airing cupboard.

• Kitchen cupboard.

• Extension.

• Alternative external wall.

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Moving a boiler can require new:

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• Gas pipework.

• Heating pipes.

• Hot- and cold-water pipes.

• Condensate drainage.

• Electrical connections.

• Flue arrangements.

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The farther the boiler is moved, the more expensive and disruptive the work is likely to be.

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How much does it cost to move a boiler?

A straightforward boiler relocation will often cost between approximately £600 and £1,500.

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A short move along the same wall may cost less, while relocation to another floor, garage or loft may cost £1,000 to £2,000 or more.

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The final cost depends on:

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• Distance.

• Pipe routes.

• Gas-pipe size.

• Flue requirements.

• Condensate drainage.

• Electrical work.

• Floor and wall construction.

• Making good.

• Scaffolding or roof access.

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Can a boiler be installed in a loft?

Yes, but the loft must provide suitable access and working conditions.

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The installation may require:

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• Boarded access.

• Permanent lighting.

• A safe working platform.

• Guarding around the loft hatch.

• Frost protection.

• Insulated pipework.

• A suitable flue route.

• Condensate drainage.

• Space for servicing and future replacement.

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A loft installation should be planned around long-term access rather than simply hiding the boiler.

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Can a boiler be installed in a bedroom?

Certain room-sealed boilers may be installed in a bedroom, subject to the appliance and installation meeting the relevant requirements.

The installer must consider:

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• Boiler type.

• Manufacturer instructions.

• Flue arrangement.

• Ventilation where required.

• Noise.

• Service access.

• Cupboard construction.

• Gas-safety requirements.

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Can a boiler be installed in a bathroom?

Some boilers can be installed in bathrooms, but electrical safety zones and manufacturer requirements must be considered.

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The position must be selected carefully to avoid unsafe proximity to baths, showers and water outlets.

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Will I be without heating and hot water?

The heating and hot water will normally be unavailable while the system is drained and the boiler is disconnected.

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For a one-day installation, services are generally restored by the end of the working day.

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More complicated conversions or relocations may leave the property without heating or hot water overnight.

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The installer should explain the programme before work begins.

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Boiler Installation Costs

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How much does a new boiler installation cost?

The cost of installing a new boiler can vary considerably.

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A straightforward combi-boiler replacement may commonly cost from around £2,000, while larger, higher-output or more complicated installations may cost £3,000 to £5,000 or more.

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The final price depends on:

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• Boiler make and model.

• Boiler type.

• Boiler output.

• Existing system.

• Boiler location.

• Gas-pipe alterations.

• Flue arrangement.

• Condensate drainage.

• Controls.

• Magnetic filter.

• System cleaning.

• Cylinder or tank removal.

• Radiator work.

• Labour and regional pricing.

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Why do boiler quotations vary so much?

Installers may be quoting for different specifications.

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One quotation might include:

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• A premium boiler.

• Ten-year warranty.

• Smart controls.

• Magnetic filter.

• Power flushing.

• Gas-pipe upgrade.

• New radiator valves.

• Making good.

• Extended aftercare.

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Another quotation may include only the basic boiler replacement.

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Homeowners should compare the complete scope rather than the final price alone.

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What should a boiler quotation include?

A professional quotation should clearly identify:

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• Boiler manufacturer and model.

• Boiler output.

• Boiler type.

• Proposed position.

• Flue arrangement.

• Controls.

• Magnetic filter.

• Cleaning method.

• Corrosion inhibitor.

• Gas-pipe alterations.

• Condensate work.

• Electrical work.

• Removal of the existing boiler.

• Waste disposal.

• Making good.

• Warranty.

• Workmanship guarantee.

• Installation time.

• Payment terms.

• VAT.

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Is the cheapest boiler quotation the best?

Not necessarily.

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A low quotation may exclude important items such as:

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• System cleaning.

• Gas-pipe upgrading.

• Heating controls.

• Magnetic filter.

• Building Regulations notification.

• Warranty registration.

• Making good.

• Aftercare.

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The best quotation should provide a suitable boiler, a clear specification and accountable installation at a fair price.

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Installer Standards

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Does a boiler installer need to be Gas Safe registered?

Anyone undertaking regulated gas work must be suitably registered with Gas Safe Register and qualified for the particular category of work.

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The homeowner should check:

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• The registered business.

• The attending engineer.

• The engineer’s identification card.

• The work categories shown on the card.

• The expiry date.

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Is every Gas Safe engineer qualified to install every boiler?

No.

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Gas Safe engineers can hold different qualifications covering:

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• Domestic natural-gas boilers.

• LPG boilers.

• Commercial boilers.

• Gas fires.

• Cookers.

• Water heaters.

• Other gas appliances.

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The engineer must be qualified for the specific appliance and fuel involved.

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Who can install an oil boiler?

Oil boilers should be installed by a suitably competent oil-heating professional.

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Many oil installers are registered with OFTEC, which operates a competent-person scheme covering oil-fired appliances, storage tanks and associated work.

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Can a plumber install a boiler and ask someone else to sign it off?

An unregistered person cannot legally undertake regulated gas work and then ask a Gas Safe engineer to sign it off after completion.

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The registered engineer must control and take responsibility for the gas work they carry out.

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Should the installer inspect the whole heating system?

Yes.

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A professional installer should assess:

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• Boiler condition.

• Radiators.

• Pipework.

• Water quality.

• Pumps.

• Controls.

• Gas supply.

• Water pressure.

• Hot-water demand.

• Flue route.

• Condensate drainage.

• Electrical requirements.

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A new boiler should not simply be connected to an unsuitable or contaminated system.

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Heating-System Cleaning

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Does the heating system need flushing?

The system should be inspected and cleaned to a level appropriate to its condition.

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Cleaning may involve:

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• Chemical cleaning.

• Mains-pressure flushing.

• Power flushing.

• Individual radiator flushing.

• Replacement of blocked components.

Not every installation requires the same method.

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What is a power flush?

A power flush uses specialist equipment and cleaning chemicals to circulate water through the heating system at an increased flow rate.

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It is intended to remove:

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• Sludge.

• Corrosion deposits.

• Contaminated water.

• Debris.

• Some restrictions within radiators and pipework.

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A power flush is not automatically required with every boiler replacement.

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What is a magnetic filter?

A magnetic filter is fitted to the heating pipework to collect circulating metallic debris.

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It helps protect components such as:

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• Heat exchangers.

• Pumps.

• Valves.

• Sensors.

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The filter should be accessible and cleaned during servicing.

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Why is corrosion inhibitor added?

Corrosion inhibitor helps reduce internal corrosion and sludge formation within the heating system.

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It should normally be added when the system is refilled after cleaning or major work.

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Heating Controls

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Do I need new heating controls with a new boiler?

New or upgraded controls are often required or recommended when replacing a boiler.

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Controls may include:

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• Programmer.

• Room thermostat.

• Programmable thermostat.

• Smart thermostat.

• Weather compensation.

• Load compensation.

• Thermostatic radiator valves.

• Separate heating zones.

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The controls must be compatible with the boiler and suitable for the occupants.

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Are smart thermostats worth having?

Smart controls can be useful where the homeowner wants:

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• Remote control.

• Heating schedules.

• App-based adjustments.

• Usage information.

• Geofencing.

• Multiple heating zones.

• Improved control of energy use.

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They are not essential for every household.

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The control should be easy to use and properly configured.

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What are thermostatic radiator valves?

Thermostatic radiator valves allow the temperature of individual rooms to be adjusted.

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They can help prevent unused or naturally warm rooms from overheating.

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They do not replace the main room thermostat.

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Boiler Warranties

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Are boiler warranties any good?

A manufacturer-backed boiler warranty can provide valuable protection against eligible parts and labour costs.

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However, the warranty will normally be subject to conditions including:

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• Correct installation.

• Timely registration.

• Annual servicing.

• Completion of the Benchmark checklist.

• Use of approved components.

• Suitable system cleaning.

• Proper water treatment.

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How long should a boiler warranty be?

Boiler warranties can range from two years to 10 years or longer, depending on:

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• Manufacturer.

• Boiler model.

• Installer accreditation.

• Controls.

• Magnetic filter.

• Promotional terms.

• Registration.

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Warranty length should not be the only reason for choosing a boiler.

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Does a boiler warranty cover the entire heating system?

Usually not.

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A manufacturer warranty normally covers eligible faults within the boiler.

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It may exclude:

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• Radiators.

• Pipework.

• External pumps.

• Motorised valves.

• Thermostats.

• Smart controls.

• Hot-water cylinders.

• Sludge.

• Limescale.

• Frozen condensate pipes.

• Installation defects.

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Does the boiler need servicing every year?

Most manufacturers require annual servicing to maintain the warranty.

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The homeowner should retain:

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• Service invoices.

• Service reports.

• Benchmark records.

• Engineer details.

• Manufacturer correspondence.

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Who registers the boiler warranty?

The warranty may be registered by the installer or homeowner.

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The homeowner should obtain:

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• Warranty certificate.

• Registration number.

• Start date.

• Expiry date.

• Boiler model.

• Serial number.

• Manufacturer confirmation.

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Do not assume registration has been completed without receiving confirmation.

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What is an installer workmanship guarantee?

A workmanship guarantee covers eligible defects arising from the installation work rather than manufacturing defects within the boiler.

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This may include problems with newly installed:

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• Pipe connections.

• Controls.

• Flue sealing.

• Condensate connections.

• Electrical connections.

• Associated installation work.

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The duration and conditions should be confirmed in writing.

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Boiler Servicing

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How often should a boiler be serviced?

A boiler should normally be serviced once every year.

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Annual servicing can:

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• Help maintain the warranty.

• Check safe operation.

• Identify developing faults.

• Examine combustion.

• Check the flue.

• Inspect accessible components.

• Confirm system pressure.

• Reduce the risk of breakdown.

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When is the best time to service a boiler?

Many homeowners arrange servicing during spring or summer.

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This can help identify problems before colder weather and may avoid the busiest winter breakdown period.

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How long does a boiler service take?

A routine domestic boiler service will often take approximately 30 to 60 minutes.

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It may take longer where:

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• The boiler is difficult to access.

• Faults are discovered.

• Components require cleaning.

• The system has poor pressure.

• The service history is incomplete.

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What does a boiler service include?

The engineer may check:

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• Appliance condition.

• Combustion performance.

• Flue integrity.

• Safety devices.

• Gas pressure and rate.

• Signs of leakage.

• Boiler controls.

• Condensate arrangements.

• System pressure.

• Service and fault history.

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A service is not necessarily the same as dismantling and cleaning every boiler component.

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Does annual servicing include repairs?

Normally not.

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The service charge generally covers inspection and routine servicing.

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Replacement parts and repair labour may be charged separately unless the boiler is covered by a warranty or maintenance plan.

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Boiler Repairs

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Why is my boiler losing pressure?

Possible causes include:

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• Leaking radiator valves.

• Leaking pipework.

• Faulty pressure-relief valve.

• Expansion-vessel problems.

• Internal boiler leakage.

• Recently bled radiators.

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Repeated pressure loss should be investigated by a heating engineer.

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Why does my boiler keep switching off?

Possible reasons include:

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• Low water pressure.

• Overheating.

• Pump problems.

• Thermostat faults.

• Blocked condensate pipe.

• Ignition failure.

• Poor circulation.

• Frozen external pipework.

• Faulty sensors.

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The fault code and symptoms should be recorded before contacting an engineer.

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Why do I have heating but no hot water?

Possible causes depend on the boiler type and may include:

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• Diverter-valve failure.

• Flow-sensor problem.

• Plate heat-exchanger blockage.

• Cylinder thermostat fault.

• Motorised-valve failure.

• Control problem.

• Hot-water cylinder issue.

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A qualified engineer should diagnose the system.

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Why do I have hot water but no heating?

Possible causes include:

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• Room thermostat settings.

• Programmer settings.

• Low pressure.

• Pump failure.

• Motorised valve fault.

• Air in the system.

• Control failure.

• Boiler fault.

• Stuck radiator valves.

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Why are some radiators cold?

Cold radiators may result from:

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• Trapped air.

• Sludge.

• Poor balancing.

• Stuck radiator valves.

• Pump problems.

• Restricted pipework.

• Low system pressure.

• Incorrect control settings.

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A cold area at the top often suggests trapped air. A cold area at the bottom may indicate sludge or poor circulation.

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Is a leaking boiler dangerous?

A leaking boiler should be inspected.

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Water can damage:

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• Electrical components.

• Internal controls.

• Floors.

• Walls.

• Cupboards.

• Nearby finishes.

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Where there is a gas smell, suspected carbon monoxide or any immediate safety concern, the appliance should not be used and the appropriate emergency procedure should be followed.

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Should I repair or replace my boiler?

Repair may make sense where the boiler is:

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• Relatively new.

• Generally reliable.

• Still supported by the manufacturer.

• Economical to repair.

• Suitable for the property.

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Replacement may be more appropriate where it is:

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• Old.

• Frequently breaking down.

• Expensive to repair.

• Inefficient.

• Unsupported.

• Poorly sized.

• Incompatible with modern controls.

• Showing corrosion or repeated component failure.

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Boiler Replacement

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How long should a boiler last?

A well-installed and properly maintained boiler may last around 10 to 15 years or longer.

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Its lifespan will depend on:

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• Installation quality.

• System cleanliness.

• Water treatment.

• Usage.

• Maintenance.

• Boiler model.

• Availability of replacement parts.

• Heating-system design.

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What are the signs that a boiler needs replacing?

Common signs include:

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• Frequent breakdowns.

• Increasing repair bills.

• Poor heating performance.

• Inconsistent hot water.

• Unusual noises.

• Corrosion.

• Obsolete components.

• Poor energy efficiency.

• Inability to work with improved controls.

• The boiler being more than 10 to 15 years old.

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Will a new boiler reduce my energy bills?

A modern boiler may use less energy than an older inefficient appliance.

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The actual saving depends on:

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• Condition of the existing boiler.

• Property insulation.

• Heating controls.

• Household behaviour.

• Boiler sizing.

• Flow temperature.

• Radiator performance.

• Fuel prices.

• Heating-system design.

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A new boiler will not correct poor insulation or badly designed heating pipework.

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Do I need to replace my radiators with a new boiler?

Not necessarily.

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Existing radiators can often be retained if they are:

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• In good condition.

• Adequately sized.

• Free from major sludge or corrosion.

• Compatible with the proposed heating temperatures.

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Replacement may be recommended where radiators are leaking, undersized, badly corroded or restricting efficient system performance.

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Can I replace a conventional boiler with a combi boiler?

Often yes, subject to:

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• Adequate water pressure.

• Adequate water flow.

• Suitable gas supply.

• Hot-water requirements.

• Number of bathrooms.

• Pipework alterations.

• Removal of tanks and cylinders.

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The installer should assess whether the conversion will deliver acceptable hot-water performance.

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Certificates and Documentation

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What is the Benchmark checklist?

The Benchmark checklist records important installation and commissioning information.

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It may include:

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• Installer details.

• Boiler details.

• Installation date.

• Gas checks.

• Combustion results.

• System cleaning.

• Water treatment.

• Control settings.

• Commissioning confirmation.

• Customer handover.

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The homeowner should keep the completed checklist with the boiler records.

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Will I receive a Building Regulations certificate?

Eligible boiler replacement work should normally be notified through the appropriate route.

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The homeowner may receive a Building Regulations compliance certificate after the installer submits the notification.

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This certificate is separate from the boiler warranty and invoice.

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What documents should I receive?

Depending on the work, documents may include:

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• Quotation.

• Invoice.

• Boiler manual.

• Benchmark checklist.

• Building Regulations certificate.

• Manufacturer warranty.

• Installer workmanship guarantee.

• Gas Safe or OFTEC information.

• Control instructions.

• Filter information.

• Service requirements.

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Making an APN Boilers Enquiry

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What information should I provide?

Useful information includes:

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• Property postcode.

• Property type.

• Number of bedrooms.

• Number of bathrooms.

• Existing boiler make and model.

• Boiler age.

• Current boiler location.

• Whether it is working.

• Fault code.

• Existing cylinder or tanks.

• Proposed boiler location.

• Preferred timescale.

• Photographs.

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Can I submit photographs?

Yes.

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Useful photographs may show:

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• The boiler.

• Boiler controls.

• Nearby pipework.

• Flue position.

• Gas meter.

• Hot-water cylinder.

• Loft tanks.

• Proposed new boiler position.

• Fault code display.

Photographs can help with the initial assessment but may not replace a site survey.

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Can I get a boiler quote without a site visit?

Some straightforward boiler replacements may be quoted using:

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• Photographs.

• Video survey.

• Property information.

• Existing boiler details.

• Water-flow checks.

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More complicated work will normally require a site survey.

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Am I required to accept the installer’s quotation?

No.

The homeowner should review:

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• Specification.

• Price.

• Boiler choice.

• Controls.

• Warranty.

• Installation period.

• Payment terms.

• Installer credentials.

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The decision to proceed remains with the homeowner.

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Boiler FAQs – The Simple Answer

 

A boiler installation should be approached as a complete heating-system project rather than simply replacing one appliance.

​

The installer should consider:

​

• Property heat demand.

• Hot-water requirements.

• Gas and water supplies.

• Existing pipework.

• Radiators.

• Heating controls.

• Flue position.

• Condensate drainage.

• System cleanliness.

• Warranty.

• Commissioning.

• Documentation.

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APN Boilers helps homeowners explain what they need and connect with suitable heating professionals covering their location and type of work.

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The homeowner should always review the installer’s quotation, confirm current registrations and make sure the proposed boiler and heating system are right for the property.

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