How Much is a New Boiler?

How much does a combi boiler replacement cost?

The average combi boiler replacement cost is between £1,600 to £3,500. inc. VAT

A combi boiler to combi boiler swap is one of the quickest boiler installation options available as the heating system is usually already set up to work with a boiler of this type. However, if the gas supply needs to be upgraded from 15mm to 22mm to meet current regulations, additional charges will apply.

What’s included in a combi boiler replacement?

• Modern condensing combi boiler
• A horizontal or vertical flue
• Microbubble Deaerator (if needed)
• Magnetic filter
• Limescale filter (if needed)
• A Boiler Plus compliant programmable thermostat or an internet-enabled learning thermostat
• Chemical Flush & Inhibitor
• Associated Pipework

In addition to the above items, we also provide the following when undertaking a combi boiler replacement at Boilerhut:

• Chemical flush and inhibitor
• Up to 10-year parts and labour warranty
• Commissioning of the boiler and benchmarking
• Building Regulation notification with certification including landlord certificates
• Handover and induction on the boiler and controls

How much does a back boiler to combi conversion cost?

The average back boiler to combi boiler installation cost is between £2,200 to £4,500 inc. VAT.

Replacing a back boiler with a combi boiler requires additional work than other types of boiler replacement, this is due to the nature of this type of boiler. The back boiler will need to be decommissioned. This can either be removed, or it can be left in place but disconnected from the gas mains – the choice is yours and is something that we will discuss with you ahead of the installation. 

What’s included in a back boiler to combi boiler installation?

• Modern condensing combi boiler
• A vertical flue (most back boiler to combi boiler installations will use a vertical flue rather than a horizontal flue)
• Microbubble deaerator (if needed)
• Magnetic filter
• Limescale filter (if needed)
• A Boiler Plus compliant programmable thermostat or an internet-enabled learning thermostat
• North-facing weather compensation (if feasible)
• All necessary pipework

In addition to the above items, we also provide the following when undertaking a back boiler to combi boiler installation at Boilerhut:

• Chemical flush and inhibitor
• Up to 10-year parts and labour warranty
• Commissioning of the boiler and benchmarking
• Building Regulation notification with certification including landlord certificates
• Handover and induction on the boiler and controls

How much does central heating installation cost?

The average cost for a full central heating installation including a new combi boiler is between £4,000 to £6,000 inc. VAT.

What’s included in a full central heating and new combi boiler installation?

Central heating installation will include the supply and installation of the following items:

• Modern condensing combi boiler
• A horizontal or vertical flue
• Microbubble deaerator (if needed)
• Magnetic filter
• Limescale filter (if needed)
• A Boiler Plus compliant programmable thermostat or an internet-enabled learning thermostat
• North-facing weather compensation (if feasible)
• All necessary pipework
• New gas run
• Radiators
• TRVs (Thermostatic Radiator Valves) or lock-shield radiator valves

What can affect the cost of a new boiler?

Your choice of boiler 

The boiler you choose will ultimately have the biggest bearing on the cost. Like anything else you purchase, boilers are available from many different manufacturers and range from budget to premium based on their specification. Choosing the correct size kW output for your home and the heating and hot water needs of your household is the easiest way to ensure that you are not overpaying for your boiler. At Boilerhut, our team comprises experienced heating engineers who will correctly size your new boiler based on the heating and hot water you require.

The type of installation

The cost of a new boiler will also depend on how labour intensive the installation is. If for instance, you are swapping like for like, e.g. a combi to combi swap, this will be much less labour intensive than the conversion of your heating system, e.g. back boiler to combi conversion. This is simply due to how long it will take the engineer to complete the installation. As a guide, a combi to combi swap takes one day to complete, whilst a back boiler to combi conversion takes around two to three days.

At Boilerhut, all of our installation costs are included in the total cost for the boiler.

Boiler location

The location of your new boiler will also have a bearing on the cost of the installation. Generally, it’s cheaper to keep your boiler in the same location. If the boiler is being relocated to another location in your property, this can add extra costs due to additional pipework and labour being required. 

Cost: £100 to £700

Magnetic filter

Magnetic filters help catch most of the magnetite sludge that circulates around your heating system. This sludge usually sits at the bottom of your radiators and can damage your radiators and your boiler’s components.

Benefits include:

• Reduced energy bills
• Drastic improvement to your boiler’s efficiency
• Reduced likelihood of frequent/expensive repairs
• Extension of boiler’s lifespan
• Reduction of carbon footprint

Do you want to know more? Our guide ‘Are magnetic filters worth it?‘ will assist you. 

Hard water filter

If there’s a build-up of limescale in your system, the flow of water becomes restricted. When this occurs, the boiler’s internal heat exchanger will rise in temperature. If it gets hot enough, the water starts to boil, causing those kettling noises to come from your boiler, so getting a filter is a no-brainer.

Advanced flush/chemical flush

You’ll need a chemical or power flush arranged to help clear any sludge you already have in your system.

What is a chemical flush?

Using rapid heat cleaner chemicals, chemical flushes break down and disperse the sludge that builds over time. With a strong final flush and added inhibitor, your system gets a much-needed clean to improve its lifespan and quality.

What is an advanced flush?

An advanced flush is a similar process but includes the use of a machine to help push the sludge out of the system. The machine has a pump attached to your heating system which sends powerful chemicals through your pipework at high speed. They’re an effective method of clearing your system, but they’re not ideal for weaker, older systems.

Upgraded heating controls

Having a high-quality thermostat is vital for allowing users full control over their central heating system.

Modern thermostats are becoming increasingly advanced in their capabilities. Examples include Wi-Fi enabled learning thermostat controls such as Tado, Nest and Hive. These controls will adapt to the heating and hot water needs of your household to help save you money in the long run. Learning thermostats aren’t the only option though, more basic thermostats are also available. 

Cost of a basic thermostat: From £50

Cost of a Wi-Fi enabled learning thermostat control: £150 to £300

Gas Upgrade

If your gas pipework needs to be upgraded to meet Gas Safe regulations, it will need to be replaced and upgraded to a 22mm supply pipe from the boiler to the meter.

Speaking with an expert about your new boiler installation plans is the best way to find out if you require a gas upgrade or not. 

Cost: £40 – £500

Vertical flue

In most properties, it’s more common for a boiler flue to exit the building horizontally.

For some, the flue will need to be redirected to exit your property vertically through the roof. This process will incur further costs, not so much because of labour but because of the materials required.

Cost: £300 – £400

Condensate Pump

If your boiler needs to be installed at the centre of your property (usually in an airing cupboard), you won’t have the access required for an internal condensate pipe to be installed. The solution for this is to have a condensate pump installed, this will pump the condensate (acidic water) into the attic space and can be directed down a soil stack or downpipe. This will be necessary to ensure that your new boiler complies with current boiler and flue regulations.

Cost: £120 to £300

Additional Scaffolding

Although it depends on the installation, there may be occasions where hiring scaffolding is required. If your chosen installer is professional and experienced, they’ll inform you of this beforehand. For any installation, always make sure you fully understand your terms and conditions.