Combi Boiler Costs in the UK 2022

When opposed to older boiler types, combi boilers are relatively efficient.

Indeed, switching your boiler with a brand new combi boiler might save you up to £300 per year on heating costs.

Combi boilers are significantly less complicated than traditional heating systems, resulting in lower installation costs.

What is a combi boiler?

The most widely used form of boiler is a combi (or combination) boiler.

The compact form of a combi boiler system saves room in your home by supplying hot water straight to your taps or radiators, eliminating the need for a storage tank. The main benefit of a combi boiler is its cost-effectiveness.

You only pay for what you use because it provides hot water on demand. As a result, it is both incredible energy and financially sustainable.

Factors that can impact the installation cost

It is never a good idea to try to install a boiler on your own. This is not only risky, but it also puts your home in jeopardy.

Furthermore, even if you had the boiler installed, it will need to be tested and signed off by a professional.

Once you’ve purchased a boiler, it is important to contact a professional for the installation, The installation price that will be quoted to you might vary depending on the following factors:

Type of boiler

The installation process varies depending on the type of boiler you pick. Combi boilers are often the least expensive to install, whereas traditional boilers are the most expensive.

In addition, the boiler’s power source, which might be either gas or electricity, also affects how much it costs. A gas combi boiler is often less expensive than a traditional gas boiler.

Size of the boiler

The size of the boiler is another important factor that influences the price you are given for boiler installation.

Larger boilers are more expensive to install than smaller boilers, as a matter of convention. Large boilers may require two to three people to lift and install, whilst smaller boilers may just require one person. This influences the labor costs of installation.

Your Location

The cost of installing a boiler is determined by the amount of labor required. This varies depending on your location and the company you hire, as well as the length of time it takes to install the boiler and the number of engineers needed.

Installing a new boiler will cost between £500 and £1,000 on average, depending on the style of installation.

The need for additional upgrades

Any renovations or adjustments you may require when the new boiler is installed are the additional factors that impact the costs you are charged for boiler installation.

In some circumstances, additional pipes, valves, or electrical outlets may be required to accommodate the new boiler being installed.

You should anticipate paying more if you need any renovations or alterations to the pipes or power source than someone who does not.

Boiler conversion

Some boiler upgrades are simple. This entails loosening a few connections, removing the old boiler, and installing the new boiler.

In this case, your boiler installer will be able to test the boiler immediately away and sign it off as Gas Safe. However, not all boiler installs are that straightforward.

If your new boiler type does not match your old one, the contractor may need to drill the holes again wherever needed and even modify the plumbing to install it.

All of this requires a bit of time, which will add to the expense of installing your new boiler.

How much is a standalone combi boiler?

Without including any additional cost, the boiler itself might represent a significant portion of the total cost.

Based on the system type and model range, new boilers can cost anywhere from £500 to £2,500.

A new system boiler can cost anywhere from £600 and £900 for the most affordable model, £900 to £1,300 for a mid-range model, and £1,300 to 2,500 for a luxury model.

Depending on the size and quality, a typical or heat-only boiler costs £500 to £2,500. For a biomass boiler, you may be typically charged anything from £7,000 to £15,000.

These are the pricing for the standalone boiler just, not including Gas Safe Installation or any other optional additions.

How much is a combi boiler with Gas Safe Installation?

If you opt for a small combi condensing boiler, you should expect to pay between £500 and £2,500 for the boiler, with an average total cost of £2,000, including installation.

If your old boiler was also a combi boiler, the installation would cost approximately £800. If it were normal, however, you’d pay around £1,500.

If you need new plumbing, the cabinet has to be removed, or the space around it needs to be cleared, the price of a new boiler may be influenced.

Your installation time will be determined by these criteria, and because you’ll be paid hourly, your cost will rise as well.

Conventional to Combi boiler conversion cost

The cost of installing a gas combi boiler in a small-medium residence ranges from £1,800 to £2,200.

This figure covers the cost of a complete combi boiler replacement, which involves purchasing a new boiler to replace an existing one of the same type.


Trying to find out how much you will be charged to install a gas combi boiler in your home may be a challenge, as you will be offered a variety of figures ranging from £1,000 to £6,000, depending on the size of your home, the type of boiler you choose, and other considerations.

To select the ideal combi boiler for your space, you should always look for a fixed quotation that includes the desired boiler along with all the installation charges, as well as a total part and labor warranty that meets your requirements.