Guide to New Boiler Installation Costs

How much will it cost to install a new gas boiler in 2018? Below is our updated guide to fitted boiler prices. We have detailed how much it will cost to install a combi boiler, a regular boiler and replacing a back boiler. We have broken boiler installation costs down into the price of the boiler and the total cost of the installation (NB the installation costs include the price of the boiler).

NEW! How much does central heating cost to install? We have added to our popular guide to show costs for installing a full central heating system (new boiler and new radiators) in a 1 bedroom flat, 3 bedroom house and 5 bedroom house.

Boiler Installation Costs

We have provided some estimated installation costs for three common scenarios:

  • Regular (Heat Only) boiler installation
  • Combination boiler installation
  • Back boiler replacement

For more on types of boiler (combi, heat only and system) try our Boiler Types Explained guide.

We have assumed a mid–range boiler cost with a standard installation set up. NB there may be additional costs for example if:

  • the gas pipe is undersized and needs to be re-run
  • the system requires a condensate pipe for the first time
  • the system needs to be sealed (i.e. there are currently expansion tanks in the loft)
  • there are some building works, for example to brick up a large existing flue hole

Cost to install a Regular boiler

Regular boilers are ‘heat only’ boilers. Very simply, the boiler will provide the heating and a cylinder will provide hot water.

The two scenarios below show rough costs for 1) replacing a regular boiler in its existing location and 2) a rough cost for installing a new regular boiler in a new location.

The cost for moving the boiler will vary according to whether it will be in the same room or moved to another room. In both cases we have assumed the cylinder and all other existing equipment are left in place. To review heat only boiler prices by boiler brand read our Guide to Heat Only Boiler Prices

Installation of a new regular boiler   Approx cost with mid range boiler   Time taken  
1) Replacing an existing regular boiler
with a new boiler, in the same location
£1,750 1 day
2) Replacing an existing regular boiler
with a new boiler, in a new location
£2,100 1.5 days

Cost to install a Combi boiler

Combination boilers provide heating and hot water via the boiler (there is no cylinder). There are two main scenarios for combination boilers: 1) The new combi boiler is replacing an existing combi boiler or 2) the new combi boiler is replacing a regular boiler and hot water cylinder.

To know if a combi boiler is suitable for your home, read our Guide to Combi Boilers. From more on pricing, read our Guide to Combi Boiler Prices, where we review the prices, efficiencies, warranties and hot water performance of 83 models of boiler from 9 boiler brands

1) Replacing an existing combi boiler

The two cost scenarios below show rough costs for a new combi boiler in the same location and for installing a new combi boiler in a new location. Again the cost for moving the boiler will vary according to where it is moved to.

Installation of a new combi boiler   Approx cost with mid range boiler   Time taken  
1) Replacing an existing combi boiler
with a new boiler, in the same location
£1,995 1 day
2) Replacing an existing combi boiler
with a new boiler, in a new location
£2,600 1.5 days

2) Replacing a regular boiler and hot water cylinder with a combi boiler

In this scenario there are a lot of additional works to remove the hot water cylinder and re-direct the hot water pipes to the new combi boiler location.

Conversion to a new combi boiler system   Approx cost with mid range boiler   Time taken  
Replacing an existing regular boiler and
hot water tank with a new combi boiler
£2,950 2.5 days

Cost to replace a Back boiler

It is no longer possible to replace a back boiler with another back boiler, read our Guide to Back Boilers to find out more on repairing, maintenance and replacement.

We have provided two approximate costs for replacing a back boiler:

1) The back boiler is removed and replaced with a heat only boiler, but the hot water tank is retained.
2) The back boiler and hot water tank are removed and replaced with a combination boiler

Type of boiler replacement - average figures.
Price will vary according to scope of works.  
Approx cost with mid range boiler   Time taken  
1) Replacing a back boiler with a new heat only boiler
and retaining the hot water tank
£2,700 2 days
2) Replacing a back boiler and hot water tank
with a new combi boiler
£2,950 2.5 days
3) Replacing existing back boiler with a new style boiler
​and decorative fireplace
It is currently not possible to install a new back boiler NA

Central Heating Installation Cost

When fitting a 'full heating system' i.e. boiler plus radiators, costs will vary according to the size of the property. The table below gives and indication of central heating system costs for a 1 bedroom flat, 3 bedroom house and a 5 bedroom house. Costs include an appropriately sized combination boiler fitted in the kitchen with a standard flue kit, all gas and system pipework, standard manufacturer controls and radiators with thermostatic radiator valves. Read our Guide to central heating boilers and systems for a more indepth review.

Central Heating System Installation Scenario Approx cost with mid range boiler   Time taken  
1) 1 bed flat £3,500 2.5 days
2) 3 bedroom house £4,250 3 days
3) 5 bedroom house £5,500 4 days
 

What would you like to do next

Use our calculator to get an estimate of boiler installation cost

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Boiler Prices

Boiler prices vary considerably as a result of build qualities and levels of after-sales support. As a general rule, budget boilers can offer shorter life spans, shorter warranties and reduced levels of customer support. Whilst they are cheap to install they tend to be expensive to maintain and less efficient to run. 

Those considering replacing their gas boiler will be presented with a wide range of boiler manufacturers with little insight as to why prices vary so much. We want to cut through the detail and provide you with the salient details. The easiest way to sum up the variations in price and quality is to undertake a specific comparison on similar models.

We have created a comparison table (below) to compare a typical 24kW combination boiler from budget, lower-range, mid-range and high end models. Not all of the specifications will apply to every boiler in that category, but most will and importantly it will give you the information to ask the right questions.

Want more specific boiler prices? We provide three incredibly comprehensive guides to boiler prices that review the prices, efficienies, size, warranty and hot water flow rates of ALL of the boiler models from 9 popular boiler manufacturers. Find out more here: Combi Boiler Prices; Heat Only Boiler Prices; System Boiler Prices. If you are not sure which type of boiler you have, read our Guide to Boiler Types - its quick and easy to work out!

Price comparison table Entry Level Economy Mid Range  Premium
Approx cost of boiler only £600.00 £700.00 £900.00 £1000.00
Efficiency 89%> 89% 94% 94%
Warranty 2-5 years 5-7 years 7-8 years 8-10 years
Life Expectancy 7 years 7-10 years 10 years+ 10 years+
After-salescare Strict terms that must be met for the manufacturer to honour warranty Reasonable terms ​that must be met for the manufacturer to honour warranty No quibble guarantee to repair or replace (betters any warranty cover) No quibble guarantee to repair or replace (betters any warranty cover)
T&Cs Customer must pay for an engineer to attend. Money is refunded if all paperwork is present and genuine fault found Customer MAY have to pay a deposit which will be refunded if access is granted and it is a genuine manufacturer fault No quibble call out. Customers not required to pay for a visit. Will repair without fuss. Includes programmers, filters and tanks No quibble call out. Customers not required to pay for a visit. Will repair without fuss. Includes programmers, filters and tanks
Call centre opening hours Mon - Fri only Mon - Fri, Sat & Sun AM Mon - Sat. Sun AM Mon - Sat. Sun AM
Who attends Sub contracted engineers Manufacturer's engineers Manufacturer's engineers Manufacturer's engineers

Results overview

​At the budget end the boiler is nearly half the price of an upper end boiler. However the call centre is only manned Monday - Friday and the warranty terms are strict with lots of wriggle room for the manufacturer to refuse to honour it.

At the mid – upper end of the market customers benefit from long term, no quibble guarantees, better life expectancies and long hours of opening. Many of the mainstream manufacturers offer Accredited or Approved Installer Schemes that improve your warranty terms, read our Guide to Approved Installer Schemes to see which boiler brands provide an enhanced after sales care package.

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