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 (if needed)
• 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 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 (if needed)
• Limescale filter (if needed)
• A Boiler Plus compliant programmable thermostat or an internet-enabled learning thermostat
• North-facing weather compensation
• 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 (if needed)
• Limescale filter (if needed)
• A Boiler Plus compliant programmable thermostat or an internet-enabled learning thermostat
• North-facing weather compensation
• 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?

The following extras can affect the price of a new boiler:

1. 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

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

2. Hardwater 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 steam, causing those ‘gurgling’ noises to come from your boiler, so getting a filter is a no-brainer.

3. Power 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 a power flush?

A power 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.

4. Relocating the boiler

You might find that during the planning process for your new boiler, there are better places for it to be positioned. Any position change for your new boiler will add more to the cost, due to extra pipework and manual labour.

As a general rule, it’s much cheaper to keep your new boiler in the same location. If you want it moved, you can expect it to add around £300 to £700 to the total cost of a new boiler.

5. Boiler Size/kW Rating

The bigger the kW rating a boiler has, the more the new boiler cost will be. The physical size of a boiler is fairly consistent across manufacturers and it is not actually based on the number of radiators you have either.

6. 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 the Nest Learning Thermostat, which adapts to your living behaviours to help save more money in the long run. A basic thermostat will cost just £20, while a more complex, Wi-Fi controlled thermostat will cost between £200 to £300.

7. 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. 

Upgrading your gas pipework can increase the cost by anything between £200 and £500, but it depends on how difficult the installation would be.

8. Flue Position

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 (often through the roof). This process will incur further costs, not so much because of labour but because of the materials required. For the supply and installation of a vertical flue from a horizontal flue, you can expect to be charged between £300 -£400.

9. Condensate Pump

On occasion, a boiler will be installed at the centre of the property (usually in an airing cupboard). When this occurs, you won’t have the access required for an internal condensate pipe to be installed.

The solution? Have a condensate pump installed – this means the condensate (acidic water) can be pumped up into the attic space. It can then be directed down a soil stack or downpipe. This can cost an extra £180 to £300. Costs such as these must be included to ensure your new boiler installation complies with current boiler and flue regulations.

10. 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.