Guide to New Boiler Installation Costs

How much will it cost to install a new gas boiler? Below is our guide to what an installation is likely to cost for a combi boiler, a regular boiler and replacing a back boiler. We have broken cost considerations down into the price of the boiler and the total cost of the installation (NB the installation costs include the price of the boiler).

Boiler Prices

Boiler prices vary considerably as a result of build qualities and levels of after-sales support. As a general rule, budget boilers 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.

Price comparison table Budget Price Lower Range Price Mid Range Price High End Price
Approx cost of
boiler only
£565.00 £655.00 £850.00 £990.00
Efficiency 89% 89% 94% 94%
Warranty 2 years 5-7 years 7-8 years 8-10 years
Life Expectancy 7 years 7-10 years 10 years+ 10 years+
After-sales
care
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

​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. For more on manufacturer guarantees and warranties read our Guide to Worcester Boiler Guarantees.

Boiler Installation Costs

We have attempted to provide some rough boiler installation costs for some common installation scenarios. There are three common types of installations:

  • Regular boiler installation
  • Combination boiler installation
  • Back boiler replacement

The tables below show a few scenarios for each type of installation. 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.

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
£2,050 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.

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
£2,550 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
£2,900 2.5 day

Cost to replace a Back boiler

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

1) The back boiler is removed and replaced with a system 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 system boiler
and retaining the hot water tank
£2,600 2 days
2) Replacing a back boiler and hot water tank
with a new combi boiler
£2,900 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

 

For a bespoke quote book a free survey with us. We do not employ sales persons, the attending engineer is an experienced installer.

Call to book a free survey with an engineer