APN Boilers helps homeowners find experienced heating professionals who can assess the complete system and advise whether a Ferroli boiler is suitable for the property.

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Is a Ferroli Boiler Suitable for Your Home?

 

A Ferroli boiler may be worth considering where a homeowner wants:

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• A compact combi boiler

• A competitively priced boiler installation

• A natural gas or LPG-compatible appliance

• A stainless-steel primary heat exchanger

• A replacement for an existing combi boiler

• Several domestic hot-water output options

• A boiler capable of controlling more than one heating zone

• A standard seven-year manufacturer warranty

• The option to extend the warranty on qualifying installations

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The current Bluehelix HiTech RRT range is available in three combi outputs and can be configured for natural gas or LPG without requiring a separate conversion kit.

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The selected appliance must still be designed correctly into the heating system. A reasonably priced boiler will not represent good value if it is oversized, connected to dirty pipework or installed in a property with insufficient water flow.

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Ferroli Combi Boilers

 

A Ferroli combi boiler provides central heating and instantaneous hot water from one appliance.

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It does not normally require a separate hot-water cylinder or cold-water storage tank. This can release space within an airing cupboard or loft and make the heating arrangement simpler.

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A Ferroli combi boiler may suit:

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• Flats and apartments

• Smaller houses

• Medium-sized family homes

• Properties with one main bathroom

• Homes already using a combi boiler

• Properties where tanks and cylinders are being removed

• Installations where wall space is limited

• Homes without access to mains gas where LPG is available

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A combi boiler is not automatically the correct choice for every property. Homes with several bathrooms or substantial simultaneous hot-water demand may perform better with stored hot water.

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The Current Ferroli Boiler Range

 

At the time of checking, Ferroli’s current UK domestic boiler listing centres on the Bluehelix HiTech RRT combi boiler. The range includes:

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• Bluehelix HiTech RRT 24C

• Bluehelix HiTech RRT 28C

• Bluehelix HiTech RRT 34C

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Ferroli’s wider domestic product page also lists high-output and commercial-style boilers and water heaters, but the Bluehelix HiTech RRT is its principal current wall-mounted domestic combi range.

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Older ranges such as the Bluehelix Tech RRT, Modena HE and Bluehelix TEC S 45 H are now listed by Ferroli as discontinued products.

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Homeowners replacing an older Ferroli boiler should therefore confirm current model availability, spare-parts support and the most suitable modern replacement with the installer.

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Ferroli Bluehelix HiTech RRT

 

The Ferroli Bluehelix HiTech RRT is a wall-mounted condensing combi boiler available in 24C, 28C and 34C versions.

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The range includes:

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• Stainless-steel primary heat exchanger

• Natural gas and LPG compatibility

• Class 6 NOx performance

• Instantaneous domestic hot water

• Backlit graphic display

• Touch-sensitive controls

• Connection for a second room thermostat

• Broad modulation on selected models

• Seven-year standard warranty

• Compatibility with solar-assisted hot-water arrangements

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Ferroli states that the boiler has been designed for quiet operation and includes a three-piece removable casing intended to simplify servicing and maintenance.

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Bluehelix HiTech RRT 24C

 

The 24C is the smallest model in the current Bluehelix HiTech RRT combi range.

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Ferroli publishes a domestic hot-water flow rate of approximately 11.7 litres per minute at a 30°C temperature rise.

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The 24C may be considered for:

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• Flats and apartments

• Smaller houses

• Homes with one bathroom

• Properties with modest hot-water demand

• Direct replacement of a smaller combi boiler

• Homes with limited incoming water flow

• LPG installations

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The installer must still calculate the space-heating requirement. The model number should not be treated as a complete indication of the property size it can serve.

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Bluehelix HiTech RRT 28C

 

The 28C offers a higher domestic hot-water output than the 24C.

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Ferroli publishes a hot-water flow rate of approximately 13.4 litres per minute at a 30°C temperature rise.

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It may suit:

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• Small and medium-sized houses

• Properties with one main bathroom

• Homes with an additional ensuite

• Households requiring faster bath filling

• Replacement of an existing 28kW or 30kW combi

• Properties with a suitable mains-water supply

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The difference in performance will only be achieved where the incoming water main can supply the required volume of water.

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Bluehelix HiTech RRT 34C

 

The 34C is the largest combi boiler in the current Bluehelix HiTech RRT range.

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Ferroli publishes a domestic hot-water flow rate of approximately 16.2 litres per minute at a 30°C temperature rise. It also has the broadest quoted modulation ratio within the range, reaching up to approximately 1:10.

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The 34C may be considered for:

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• Medium-sized family homes

• Properties requiring stronger hot-water performance

• Homes with a bathroom and ensuite

• Replacement of an existing higher-output combi

• Properties with a strong incoming mains supply

• Households wanting quicker bath filling

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The 34C should not automatically be selected because it is the most powerful option. The installer should confirm that the water supply can support its hot-water output and that its central-heating performance is appropriate for the property.

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Comparing Ferroli Combi Boilers

 

Model Published hot-water flow / Possible property type

Bluehelix HiTech RRT 24C11.7 litres per minute / Flat or smaller house

Bluehelix HiTech RRT 28C13.4 litres per minute / Small or medium house

Bluehelix HiTech RRT 34C16.2 litres per minute / Medium family home

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The published flow rates are measured at a 30°C temperature rise. Actual performance will be affected by the incoming water temperature, mains pressure, available flow and internal pipework.

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The property descriptions are broad starting points rather than boiler-sizing calculations.

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Check the Water Flow Before Choosing a Combi

 

A larger Ferroli combi boiler will not create better mains-water pressure.

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The boiler can only heat and deliver the volume of water reaching the property. A 34kW combi connected to a restricted water main may still produce disappointing shower and bath performance.

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Before recommending a combi boiler, the installer should test:

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• Static water pressure

• Dynamic pressure while outlets are operating

• Incoming water flow

• Diameter of the incoming water main

• Condition of the internal water pipes

• Number of bathrooms and showers

• Likelihood of simultaneous hot-water use

• Distance between the boiler and outlets

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This assessment is particularly important where the homeowner expects the boiler to supply more than one shower or hot-water outlet at the same time.

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Where demand is particularly high, a system boiler and correctly sized cylinder may provide a better result than a conventional combi.

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Natural Gas and LPG Ferroli Boilers

 

The current Bluehelix HiTech RRT models can operate on natural gas or LPG. Ferroli describes the range as Multi Gas Ready, allowing the boiler to be configured without an additional LPG conversion kit.

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This may make the boiler relevant for:

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• Rural properties without mains gas

• Homes currently heated by LPG

• Replacement of an older LPG boiler

• Park homes and selected off-grid properties

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An LPG boiler must be installed and commissioned by a Gas Safe registered engineer whose qualifications include LPG work.

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The installer should also consider LPG storage, supply pressure, regulator condition and anticipated fuel consumption.

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Does Ferroli Make System Boilers?

 

Ferroli has previously supplied system boilers in the UK, including system versions of the Bluehelix Tech RRT and Modena HE.

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The discontinued Bluehelix Tech RRT range included 18S, 24S and 30S system boilers. Ferroli’s current website now places this range within its discontinued-products section.

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A system boiler heats the radiators and works with a separate hot-water cylinder. This arrangement can be more suitable for:

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• Larger houses

• Homes with two or more bathrooms

• Properties with an existing unvented cylinder

• Households using several showers

• Properties requiring stored hot water

• Heating systems with several zones

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Homeowners specifically looking for a new Ferroli system boiler should check current UK availability before specifying the brand. An installer may instead recommend a current system boiler from another manufacturer.

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Existing Ferroli system boilers may continue to be serviced or repaired where suitable replacement parts remain available.

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Older Ferroli Boilers

 

Older Ferroli installations may include models from ranges such as:

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• Bluehelix Tech RRT

• Modena HE

• Optimax

• Maxima

• Domicompact

• Modena

• Bluehelix TEC S 45 H

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Ferroli maintains manuals and replacement information for a range of discontinued boilers.

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An older Ferroli boiler does not necessarily require immediate replacement merely because the model has been discontinued. The decision should consider:

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• Boiler condition

• Frequency of breakdowns

• Availability and cost of parts

• Heating efficiency

• Quality of the existing controls

• Condition of the heat exchanger

• Whether the appliance can still be serviced safely

• Planned alterations to the property

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Where repair costs are becoming significant, replacement may provide better long-term value.

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Ferroli Boiler Prices

 

Ferroli boiler prices vary according to the model, output, supplier, controls and installation package.

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A UK boiler-price guide updated in July 2026 places Ferroli combi boiler-only prices at approximately £475 to £880. It estimates combi installation costs at approximately £1,500 to £3,500, with total installed prices typically falling between approximately £2,000 and £4,500 or more.

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The following figures provide broad homeowner allowances rather than fixed APN quotations:

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Ferroli boiler installation   /   Indicative installed cost

Straight forward 24C combi replacement £1,900–£2,800

28C combi replacement £2,000–£3,100

34C combi replacement £2,200–£3,500

Boiler relocation £3,200–£5,000+

Traditional system converted to combi £3,500–£6,000+

Major heating-system alterations / Individually assessed

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The final price will depend on the property and the work required. A low headline price will usually relate to a straightforward replacement in the same location.

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What Affects Ferroli Boiler Prices?

 

The cost of the boiler unit is only one part of the complete installation.

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The final Ferroli boiler price may be affected by:

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• Boiler model and output

• Natural gas or LPG installation

• Existing boiler position

• Proposed boiler location

• Flue length and route

• Roof or high-level flue access

• Scaffolding

• Gas-pipe size

• Condensate drainage

• Electrical work

• Heating controls

• Second heating zone

• Magnetic system filter

• System cleaning or flushing

• Chemical inhibitor

• Radiator replacement

• Thermostatic radiator valves

• Removal of tanks and cylinders

• Floor and wall access

• Making good and decoration

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The written quotation should identify whether the price includes the flue, controls, magnetic filter, system cleaning, certification and disposal of the existing appliance.

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Ferroli Boiler Replacement

 

A Ferroli boiler replacement may be relatively straightforward where the new appliance remains in the same position and the property already has a combi heating system.

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However, the installer should assess more than the dimensions of the old boiler.

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The inspection should cover:

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• Existing boiler type

• Boiler position

• Flue route and terminal

• Gas supply

• Condensate drainage

• Heating flow-and-return pipes

• Hot and cold-water connections

• Radiators and valves

• Electrical supply

• Heating controls

• System-water condition

• Incoming water pressure and flow

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Connecting a new boiler to dirty, restricted or poorly balanced pipework can limit performance and may contribute to future faults.

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The system may require cleaning, inhibitor, a magnetic filter, replacement valves or radiator balancing as part of the installation.

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Replacing an Older Ferroli Boiler

 

An existing Ferroli boiler does not have to be replaced with another Ferroli product.

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The installer should compare:

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• Current Ferroli models

• Suitable alternatives from other manufacturers

• Boiler dimensions

• Connection positions

• Flue requirements

• Available warranty

• Local access to servicing and parts

• Heating and hot-water output

• Total installed cost

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Selecting the closest modern equivalent may reduce pipework alterations, but it should not override the need to choose the most suitable boiler for the home.

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Converting to a Ferroli Combi Boiler

 

A homeowner with a traditional boiler, hot-water cylinder and roof tanks may want to convert to a Ferroli combi boiler.

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This can release storage space and remove the need to heat a separate cylinder, but it involves substantially more work than a direct combi replacement.

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The conversion may require:

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• Removal of the existing boiler

• Disconnection of the hot-water cylinder

• Removal or abandonment of roof tanks

• New hot and cold-water connections

• Heating flow-and-return alterations

• Upgraded gas pipework

• New condensate drainage

• A revised flue route

• Electrical alterations

• New heating controls

• System cleaning

• Making good

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The water pressure and incoming flow must be tested before the cylinder and tanks are removed.

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A Ferroli 34C cannot compensate for an inadequate mains supply. Where the property has several bathrooms or substantial simultaneous demand, retaining stored hot water may be the better option.

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Choosing the Correct Ferroli Boiler Size

 

The correct boiler cannot be selected accurately from the number of bedrooms alone.

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The installer should consider:

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• Property dimensions

• Construction type

• Insulation levels

• Heat loss through walls, roof and floors

• Window sizes and glazing

• Number and size of radiators

• Underfloor-heating zones

• Number of bathrooms

• Incoming water flow

• Household hot-water habits

• Planned extensions or loft conversions

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Combi boiler model sizes are frequently driven by hot-water demand rather than the property’s central-heating requirement.

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A home may need the 34C for its stronger hot-water performance even though its radiators require considerably less output.

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The boiler’s minimum output and modulation range should therefore be considered alongside its maximum rating.

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Ferroli Heating Controls

 

The Bluehelix HiTech RRT can connect to a second room thermostat, allowing an appropriately designed installation to control more than one heating zone.

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Depending on the property, the installation might include:

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• Programmable room thermostat

• Wireless thermostat

• Smart heating control

• Thermostatic radiator valves

• Separate upstairs and downstairs zones

• Hot-water preheat settings

• Weather-sensitive controls

• Underfloor-heating controls

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The controls should be considered as part of the heating design rather than selected after the boiler has been fitted.

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A larger home may benefit from separate heating zones so that unused areas do not have to be heated whenever the boiler is running.

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Ferroli Boiler Warranties

 

The Bluehelix HiTech RRT currently comes with a seven-year manufacturer’s parts-and-labour warranty, provided it is fitted with a suitable high-performance magnetic filter and serviced annually.

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Ferroli currently offers the option to upgrade qualifying Bluehelix HiTech boilers from seven to ten years for £180. The warranty must be registered within 30 days of installation.

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Homeowners should ask the installer to confirm:

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• Exact warranty period

• Whether the warranty is standard or upgraded

• Who will register the boiler

• Registration deadline

• Magnetic-filter requirements

• Annual servicing conditions

• What documents must be retained

• What is excluded from warranty cover

• Who should be contacted if a fault develops

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The written quotation should state the actual warranty applying to the selected model rather than simply referring to cover of “up to ten years.”

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The completed Benchmark commissioning record should also be retained. Ferroli notes that an incomplete or unavailable Benchmark record can affect an in-warranty engineer visit.

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Gas Safe Ferroli Boiler Installation

 

A Ferroli gas boiler must be installed by a suitably qualified Gas Safe registered engineer.

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Gas Safe Register confirms that gas businesses and engineers must appear on the official register to carry out gas work legally. The engineer’s identification should also show that they are qualified for the relevant category of work.

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Following the installation, the homeowner should normally receive:

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• Completed Benchmark commissioning record

• Building Regulations Compliance Certificate

• Ferroli warranty confirmation

• Boiler instructions

• Heating-control instructions

• Service requirements

• Itemised invoice

• Relevant electrical certification

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Gas Safe Register states that a Building Regulations Compliance Certificate should be provided following the installation of a heat-producing gas appliance. The certificate belongs to the property and should be kept safely for a future sale or remortgage.

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What Should a Ferroli Boiler Quote Include?

 

A proper quotation should identify:

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• Exact Ferroli model

• Boiler output

• Natural gas or LPG arrangement

• Proposed boiler location

• Flue arrangement

• Published hot-water performance

• Heating controls

• Heating zones

• Magnetic system filter

• System cleaning

• Chemical inhibitor

• Gas-pipe alterations

• Condensate drainage

• Electrical work

• Removal of the existing boiler

• Removal of tanks or cylinder

• Making good

• Warranty period

• Commissioning

• Certification

• VAT

• Exclusions

• Potential additional costs

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This makes it easier to compare quotations on a like-for-like basis.

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A cheaper quote may exclude the magnetic filter, system cleaning, controls, electrical work or alterations required to achieve the expected boiler performance.

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Frequently Asked Questions

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Are Ferroli boilers good boilers?

Ferroli’s current Bluehelix HiTech RRT range offers stainless-steel heat exchangers, natural gas and LPG compatibility, several combi outputs and a seven-year standard warranty. The quality of the completed system will also depend on correct sizing, installation, controls and commissioning.

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How much does a Ferroli boiler cost?

A current 2026 price guide places Ferroli combi boiler-only prices at approximately £475 to £880. A complete installed replacement may commonly cost around £2,000 to £4,500, depending on the model and work required.

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Which Ferroli combi boiler do I need?

The 24C may suit smaller homes, the 28C may suit small or medium-sized houses, and the 34C provides the strongest published hot-water performance. The final selection should follow heat-loss and water-flow testing.

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What is the current Ferroli combi boiler?

The main current domestic Ferroli combi range in the UK is the Bluehelix HiTech RRT, available in 24C, 28C and 34C versions.

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What is the difference between the Ferroli 24C and 34C?

The principal difference is domestic hot-water output. Ferroli publishes flow rates of approximately 11.7 litres per minute for the 24C and 16.2 litres per minute for the 34C at a 30°C temperature rise.

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Can a Ferroli combi supply two showers?

The larger model may provide substantial hot-water flow where the incoming mains supply is sufficient. However, a system boiler and cylinder may be more suitable where several showers or taps are frequently used together.

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Does Ferroli make LPG boilers?

The current Bluehelix HiTech RRT can be configured to operate on natural gas or LPG without an additional conversion kit.

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Does Ferroli currently make system boilers?

Ferroli has supplied system boilers in the UK, but the Bluehelix Tech RRT system models and Modena HE range are now listed as discontinued. Current availability should be confirmed directly before specifying a new Ferroli system boiler.

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How long is a Ferroli boiler warranty?

The Bluehelix HiTech RRT currently includes a seven-year standard warranty, subject to a suitable magnetic filter and annual servicing. A ten-year upgrade is available on qualifying installations.

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Does a Ferroli boiler require annual servicing?

Annual servicing is required to maintain the current Bluehelix HiTech warranty. The service record and completed Benchmark documentation should be retained.

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Who can install a Ferroli gas boiler?

A Ferroli gas boiler must be installed and commissioned by a suitably qualified Gas Safe registered engineer.

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Find the Right Ferroli Boiler for Your Home

 

Choosing the right Ferroli boiler starts with understanding the property, the existing heating system and the amount of heating and hot water the household requires. APN Boilers can connect you with experienced local heating professionals who can test the water supply, assess the radiators and pipework, recommend a suitable Ferroli boiler or alternative heating solution and provide a clear quotation for the complete installation. Tell us about your property and what you would like to achieve to take the next step towards a warmer and more efficient home.