
Boiler Servicing
Annual servicing and planned maintenance for gas, oil, electric and biomass boilers and ground source heat-pump systems.
Regular boiler servicing helps keep a heating system operating safely, reliably and efficiently.
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A boiler service is a planned inspection and maintenance visit completed while the appliance is generally still operational. It is different from a boiler repair, which investigates a known fault or breakdown.
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A typical boiler service may include:
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Checking the appliance for safe operation.
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Inspecting for leaks, corrosion and visible damage.
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Checking boiler and heating controls.
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Inspecting relevant pipework and connections.
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Cleaning components or filters where required.
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Testing safety devices.
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Checking combustion where applicable.
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Identifying developing faults.
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Confirming whether further maintenance or repair is required.
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Energy Saving Trust describes a typical boiler service as including safety checks, control checks, visual inspection for leaks or corrosion and maintenance of relevant filter systems.
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APN Boilers helps homeowners find local professionals for gas boiler servicing, oil boiler servicing, electric boiler maintenance, biomass boiler servicing and ground source heat-pump servicing throughout the UK.
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Boiler Service Near Me
Someone searching for a boiler service near me will normally want a suitably qualified local professional who can inspect the appliance, complete any required maintenance and provide a clear record of the work.
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The correct engineer depends on the heating technology:
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Gas boilers require an appropriately qualified Gas Safe registered engineer.
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LPG boilers require an engineer whose Gas Safe qualifications include the relevant LPG work.
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Oil boilers should be serviced by a technician competent in oil-fired heating.
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Electric boiler servicing may require heating and electrical competence.
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Biomass boilers require experience with solid-fuel combustion, fuel-feed equipment and flues.
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Ground source heat pumps require knowledge of refrigeration, electrical systems, ground loops and low-temperature heating.
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Gas Safe Register confirms that anyone fitting, repairing or servicing a gas boiler as part of a business must be Gas Safe registered.
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When comparing local boiler engineers, homeowners should check:
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Registration and qualifications.
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Experience with the boiler make and model.
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What is included within the service.
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Whether parts and repairs are charged separately.
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Whether a written service record will be provided.
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Manufacturer accreditation where relevant.
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Public liability insurance.
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VAT and payment terms.
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Availability if a fault is discovered.
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The lowest advertised service charge may not include the same testing, cleaning or documentation as a more comprehensive service.
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How Often Should a Boiler Be Serviced?
Most domestic boilers should normally be serviced annually, although the manufacturer’s instructions should always be followed.
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An annual service can:
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Identify wear before a complete breakdown.
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Help maintain safe operation.
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Support reliable winter heating.
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Identify leaks or corrosion.
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Maintain manufacturer-warranty conditions.
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Confirm that controls and safety devices operate correctly.
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Provide a service history for the property.
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Gas Safe Register advises homeowners to follow the boiler manufacturer’s recommended servicing frequency and suggests an annual service where the instructions are unavailable. It also notes that annual servicing is often required to maintain a new boiler’s warranty.
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Oil boilers and tanks should also be inspected regularly. OFTEC advises having an oil boiler and tank checked at least annually by a competent technician.
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When Is the Best Time to Service a Boiler?
A boiler can be serviced at any time of year.
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Spring and summer can be convenient because:
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Heating demand is lower.
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Developing faults can be addressed before winter.
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Engineers may have greater appointment availability.
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The boiler can be tested before colder weather returns.
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The homeowner is less likely to be left without essential heating during repair work.
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OFTEC advises operating heating briefly during warmer months rather than leaving equipment completely idle for long periods, because pumps and other components can seize after prolonged inactivity.
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The service should not be delayed simply because the boiler appears to be operating normally. Many safety, combustion and internal component issues may not be obvious during everyday use.
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What Does a Boiler Service Include?
The exact service procedure will depend on the boiler, fuel and manufacturer.
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A professional service may include:
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Confirming the boiler make, model and installation details.
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Reviewing previous faults and service history.
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Visual inspection of the boiler.
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Checking for water or fuel leaks.
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Inspecting accessible pipework.
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Checking boiler pressure.
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Testing the thermostat and programmer.
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Checking pumps and valves where relevant.
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Inspecting the flue.
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Checking ventilation requirements.
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Testing safety controls.
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Inspecting condensate drainage.
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Cleaning components where required.
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Checking filters.
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Testing combustion on gas, LPG, oil or biomass appliances.
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Confirming correct operation after reassembly.
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Recording findings and recommendations.
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The attending engineer should follow the manufacturer’s service instructions rather than applying an identical checklist to every appliance.
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Gas Boiler Service
A gas boiler service must be completed by an appropriately qualified Gas Safe registered engineer.
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The engineer may inspect and test:
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Boiler casing and seals.
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Burner and combustion components.
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Heat exchanger.
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Ignition system.
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Gas pressure and operating performance.
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Flue and combustion products.
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Condensate trap and pipework.
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Fans and pumps.
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Expansion vessel.
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Safety devices.
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Boiler controls.
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Signs of leakage or corrosion.
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Carbon-monoxide protection where relevant.
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Gas Safe Register advises checking the engineer’s ID card and confirming that their listed categories cover boiler work.
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The boiler casing should not be removed by the homeowner. Work on internal gas components must be left to an appropriately qualified engineer.
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Gas Boiler Service and Manufacturer Warranty
A new gas boiler commonly includes a manufacturer guarantee or warranty.
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The terms may require:
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Annual servicing.
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Servicing by a Gas Safe registered engineer.
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Completion of the service record.
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Use of approved replacement parts.
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Correct system-water treatment.
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Registration of the installation.
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Servicing within a specified time window.
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The homeowner should retain:
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Original commissioning documentation.
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Manufacturer warranty details.
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Annual service records.
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Invoices.
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Details of repairs.
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Water-treatment information.
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A missed service may affect warranty protection, depending on the manufacturer’s terms.
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Gas Boiler Service or Gas Safety Check?
A boiler service and gas safety check are not the same thing.
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Boiler Service
A service focuses on the appliance’s condition, maintenance and operation. Components may be cleaned, inspected and tested in accordance with the manufacturer’s instructions.
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Gas Safety Check
A gas safety check focuses on whether the gas appliance is operating safely at the time of inspection.
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For owner-occupied homes, annual servicing is strongly advisable but is not generally the same statutory requirement imposed on landlords.
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Landlords are legally required to arrange an annual gas-safety check for relevant gas appliances and provide the required record to tenants. Both safety checks and servicing must be completed by appropriately qualified Gas Safe registered engineers.
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A landlord may arrange a service and safety check during the same visit, but the engineer should confirm exactly what is included and what documentation will be supplied.
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Oil Boiler Service
An oil boiler service requires an assessment of the burner, boiler and oil supply.
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The technician may inspect:
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Oil burner.
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Fuel nozzle.
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Ignition electrodes.
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Photocell.
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Oil pump.
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Flexible oil lines.
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Fuel filters.
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Fire valve.
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Boiler heat exchanger.
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Combustion chamber.
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Flue and ventilation.
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Condensate system.
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Controls and safety devices.
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Visible condition of the oil tank.
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Fuel-supply pipework.
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The boiler may require cleaning to remove combustion deposits. The burner may also need adjustment and combustion testing to confirm that it operates correctly.
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OFTEC operates a register through which homeowners can find technicians qualified for commissioning, servicing, inspection and repair work on oil-heating equipment.
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Oil Boiler Service Near Me
When searching for an oil boiler service near me, homeowners should look for a technician who understands the complete oil installation rather than only the appliance.
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The visit should consider:
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The boiler.
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Oil-storage tank.
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Tank supports.
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Oil level and gauge.
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Filters and valves.
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Fire-safety controls.
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Fuel pipe.
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Flue.
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Ventilation.
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Condensate drainage.
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Heating-system controls.
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An oil boiler may appear to be working while combustion performance, filters or fuel-supply components require attention.
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The oil tank should also be checked for:
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Cracks.
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Rust or corrosion.
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Bulging or distortion.
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Signs of leakage.
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Deteriorating supports.
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Damaged fittings.
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Vegetation obstructing inspection.
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Unexpected changes in fuel level.
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OFTEC recommends regular homeowner checks and annual professional inspection of both the boiler and oil tank.
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Electric Boiler Service
An electric boiler service does not require combustion testing, but the boiler and heating system still contain components that can deteriorate.
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A service may include checking:
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Heating elements.
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Contactors and relays.
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Electrical connections.
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Sensors.
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Circuit boards.
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Pumps.
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Expansion vessels.
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Pressure gauges.
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Safety controls.
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Thermostats.
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Zone valves.
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Heating-system pressure.
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Signs of water leakage.
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Cylinder controls.
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Consumer-unit protection.
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System-water quality.
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Electric boilers can place a substantial load on the electrical installation. Any work involving fixed wiring, protective devices or consumer-unit equipment should be undertaken by a suitably competent electrician.
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The service should distinguish between:
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Maintenance of the boiler.
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Maintenance of the wet heating system.
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Testing of the electrical supply.
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Servicing of a separate hot-water cylinder.
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Some electric systems described as combi boilers incorporate both a heating boiler and a stored hot-water cylinder. Both parts may require inspection.
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Biomass Boiler Service
A biomass boiler service can involve more routine cleaning and fuel-handling maintenance than a gas or electric boiler.
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A service may include:
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Cleaning the combustion chamber.
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Removing ash.
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Cleaning heat-exchanger surfaces.
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Inspecting automatic cleaning mechanisms.
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Checking ignition equipment.
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Inspecting the pellet, log or wood-chip feed.
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Checking augers or vacuum systems.
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Testing motors and sensors.
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Inspecting the thermal store.
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Checking pumps and controls.
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Inspecting seals and fire-safety devices.
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Checking the flue and chimney.
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Reviewing fuel quality and storage.
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Testing combustion and emissions where appropriate.
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MCS advises that biomass boilers and stoves should be kept clean and swept regularly to remove ash, although some boilers incorporate automatic cleaning systems.
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The frequency of professional servicing will depend on:
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Manufacturer instructions.
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Boiler type.
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Fuel.
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Annual operating hours.
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Fuel quality.
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Boiler output.
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Ash production.
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Whether the system serves a home or larger building.
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A biomass boiler that operates for long periods or uses variable-quality fuel may need more frequent attention than a lightly used domestic appliance.
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Biomass Fuel and Storage Checks
The technician may also examine:
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Pellet storage.
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Wood-chip bunker.
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Log storage.
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Fuel moisture.
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Signs of bridging or blockages.
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Feed-system wear.
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Dust accumulation.
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Delivery arrangements.
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Fire separation.
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Access for cleaning.
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Poor fuel quality can affect combustion, ash production, boiler efficiency and reliability.
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Homeowners should use the fuel specification stated by the appliance manufacturer rather than assuming any pellet, chip or log is suitable.
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Ground Source Heat Pump Service
A ground source heat pump service is different from servicing a combustion boiler, but annual maintenance is still recommended.
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The visit may include checking:
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Ground-loop pressure.
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Antifreeze concentration.
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Ground-loop flow and return temperatures.
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Circulation pumps.
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Electrical connections.
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Refrigerant operation.
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Filters and strainers.
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Expansion vessels.
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Heating-water pressure.
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Hot-water cylinder.
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Heating curves and controls.
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Energy-use and performance data.
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Alarms and fault history.
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Pipework insulation.
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Energy Saving Trust recommends annual heat-pump servicing and identifies ground-loop antifreeze concentration, circuit temperatures and pressure as relevant GSHP checks.
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Annual servicing may also be a condition of the manufacturer’s warranty.
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Ground Loop and Heating-System Checks
The buried ground collector is designed for long-term operation and does not usually require excavation for routine maintenance.
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However, the service should check the accessible parts of the system, including:
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Manifolds.
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Pressure gauges.
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Pumps.
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Valves.
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Air removal.
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Antifreeze protection.
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Exposed insulation.
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Signs of leakage.
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Flow rates.
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Temperature differences.
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The heating side should also be reviewed because poor radiator flow, incorrect controls or high operating temperatures can affect the heat pump’s performance.
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Energy Saving Trust’s installer guidance states that pipework insulation should be inspected during annual servicing because it can become damaged or develop gaps over time.
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Boiler Servicing and Central-Heating Maintenance
The boiler is only one component of the heating system.
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A comprehensive visit may identify issues involving:
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Radiator valves.
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Thermostatic radiator valves.
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Circulation pumps.
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Motorised valves.
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Magnetic filters.
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System pressure.
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Expansion vessels.
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Hot-water cylinders.
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Heating controls.
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Underfloor-heating manifolds.
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Sludge or corrosion.
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Poor balancing.
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Not every item will form part of a standard boiler service.
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Homeowners should clarify whether the quotation covers:
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Boiler only.
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Boiler and controls.
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Heating-system filter cleaning.
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Oil-tank inspection.
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Hot-water-cylinder inspection.
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Carbon-monoxide alarm testing.
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Radiator balancing.
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Water-quality testing.
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Additional heating-system work may be quoted separately.
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Boiler Filter Cleaning
Many modern heating systems include a magnetic or combined filter designed to collect corrosion debris.
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The filter may require cleaning during an annual boiler service.
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A blocked or heavily contaminated filter can indicate wider problems such as:
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Active corrosion.
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Inadequate inhibitor.
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Dirty heating water.
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Previous installation debris.
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Deteriorating radiators.
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Air entering the system.
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Cleaning the filter removes collected debris but does not necessarily resolve the cause of continuing contamination.
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Where significant sludge is found, the engineer may recommend water testing, chemical treatment, system cleaning or further investigation.
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Signs That a Boiler Needs Attention
Do not necessarily wait for the next planned service where the boiler develops:
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Unusual noises.
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Frequent pressure loss.
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Water leakage.
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Repeated error codes.
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Intermittent heating.
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Poor hot-water performance.
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Unexpected fuel consumption.
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Soot or staining.
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Unusual smells.
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Repeated lockouts.
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Electrical tripping.
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A carbon-monoxide alarm activation.
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A service is intended for planned maintenance. A boiler displaying an active fault may require a repair visit instead.
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Tell the engineer about the symptoms when booking so that the correct appointment and parts preparation can be arranged.
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Carbon-Monoxide Safety
Gas, oil, LPG and biomass boilers produce combustion gases and require suitable flues and air supplies.
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Homeowners should maintain carbon-monoxide alarms in accordance with the applicable requirements and manufacturer instructions.
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A suspected carbon-monoxide problem is not a routine servicing enquiry.
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Where a carbon-monoxide alarm activates or occupants experience symptoms such as headaches, nausea or dizziness:
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Stop using the appliance where safe.
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Ventilate the property.
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Leave the affected area.
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Seek urgent professional assistance.
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Obtain medical advice where exposure is suspected.
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For a suspected mains-gas emergency, contact the National Gas Emergency Service on 0800 111 999.
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Boiler Service Cost
The price of a boiler service will depend on:
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Boiler fuel.
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Appliance make and model.
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Location.
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Accessibility.
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Standard or out-of-hours appointment.
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What checks and cleaning are included.
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Whether filters are serviced.
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Whether the oil tank is inspected.
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Whether parts are required.
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Whether a safety certificate is included.
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VAT.
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Travel requirements.
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Gas boiler servicing is commonly more straightforward than servicing a larger biomass installation with fuel-feed equipment and substantial cleaning requirements.
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The quotation should confirm:
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The fixed service charge.
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What the service includes.
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Whether repairs are excluded.
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Whether consumable parts are included.
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Whether the engineer will seek approval before extra work.
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What documentation will be provided.
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Whether VAT is included.
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What Happens if a Fault Is Found?
A boiler service does not normally include unlimited repair work.
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Where the engineer discovers a fault, they should explain:
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The problem.
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Whether the boiler can continue operating safely.
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Whether it should be switched off.
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The recommended repair.
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Parts required.
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Additional cost.
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Likely timescale.
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Whether the manufacturer warranty may apply.
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Safety-critical work may need immediate attention.
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Other defects may be recorded and quoted for separately. The homeowner should receive enough information to make an informed decision.
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Boiler Service Records
After the service, ask for a written record confirming:
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Date of service.
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Boiler make and model.
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Engineer or business details.
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Registration number where relevant.
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Checks completed.
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Combustion results where appropriate.
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Defects found.
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Parts replaced.
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Recommendations.
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Next service date.
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The manufacturer’s service record should also be completed where applicable.
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Service documentation can be important for:
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Manufacturer warranties.
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Property sales.
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Landlord records.
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Insurance claims.
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Demonstrating regular maintenance.
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Future fault diagnosis.
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Boiler Service Plans
Some heating businesses offer monthly or annual service plans.
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These may include:
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Annual servicing.
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Priority appointments.
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Discounted repairs.
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Labour cover.
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Replacement parts.
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Emergency assistance.
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Heating-system cover.
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Before agreeing to a plan, check:
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Which appliances are covered.
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Boiler-age restrictions.
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Excess charges.
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Maximum repair values.
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Excluded parts.
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Waiting periods.
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Out-of-hours cover.
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Whether pre-existing faults are excluded.
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Cancellation terms.
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Whether annual servicing is guaranteed within the required warranty period.
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A service plan is not automatically better value than paying for annual servicing and repairs separately. The decision depends on the cover and the condition of the heating system.
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Find a Boiler Service Engineer Through APN Boilers
APN Boilers helps homeowners find appropriately qualified professionals for:
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Annual boiler servicing.
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Gas boiler servicing.
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Oil boiler servicing.
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LPG boiler servicing.
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Electric boiler maintenance.
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Biomass boiler servicing.
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Ground source heat-pump servicing.
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Heating-control checks.
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Oil-tank inspections.
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Boiler safety checks.
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Planned heating maintenance.
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Tell APN Boilers your postcode, boiler type, fuel, manufacturer and the date of the last service.
We will help you find an appropriate local professional to inspect and maintain your boiler or heating system.
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