Installing a new boiler can help you save money on your fuel bills, keep your house warm, and help the environment – so find out here just how much it’ll run you to set up a new boiler.


This guide is going to cover the boiler installation cost involved for various types of boiler systems, including combi, gas, oil and electric boilers. We’ll also give you tips for finding a boiler engineer and we will also supply you with all the information on related installation grants.


All household boilers will eventually need to be replaced, though doing so prior to the current boiler’s full and final breakdown can bring in significant energy savings. Of course, with prices that always go well into the four-figure territory, it’s not the kind of purchase most approach lightly or with any real joy. Still, a new boiler doesn’t have to cost a fortune and it’s always worth looking into the possibility of a repair prior to going ahead with a replacement.

How much you should spend to purchase a new boiler will greatly dependent on who’s installing the boiler. Many people believe that as long as the gas plumber/heating engineer is corgi registered (now transformed to gas safe) then it’ll be OK, however this isn’t always the case. There are many cowboy plumbers and gas fitters out there that are going to miss bits off the quotation to get the job.

Clients believe that if they want to install a new boiler, it really is is as simple as a boiler swap. According to the new regulations there’s not any such thing as an easy boiler swap any more. All new boiler installations must be set up according to the new power performance regulations which means all boilers must be A-rated. A-rated boilers are more generally known as condensing boilers.

Cleansing away the old system is critical with modern boilers as the heat exchangers are usually much smaller and may block up fast. Power flushing the central heating is the greatest means and it is also advised to fit a Magnaclean filter.

Most of the brand new boilers  would require an updated gas supply pipe (something the cowboys generally miss).

Reasons for installing a new boiler

You’re going home – your new property may not possess a boiler suitable for your needs, it could likewise be out-dated and wasteful.

Good ROI : You’re renovating – enhancing the relaxation and energy efficiency of your property must be your first priority when making any home improvements. Ensuring you have a new, efficient boiler to maintain your home warm and provided with hot water is top of the list and may boost the value of your property

Save money: According to energy saving trust a boiler is responsible for 60% of your household energy bills. Depending on how efficient is your old gas boiler, you could be wasting £200 -£300  per year on your gas bills.

Improved heating control : With the new heating controllers with TRVs and room thermostats you can set the desired temperature for each room of your house, which will both save money and keep temperature at the right levels.

Quieter boiler operation: New technology and improved design, allows new boilers to operate more quietly then older ones, which is very beneficial when a boiler is placed on the other side of a bedroom wall.

Smaller size: Modern boilers take up a lot less space the old ones and there is also the option of siting them on the wall rather than the floor, thus saving useful space.

What should you look for in a brand new boiler?

  • Firstly, be sure that you don’t need planning permission when installing a new boiler – this may be needed should you reside in a listed building or need to use a brand new flue outside of your house.
  • To satisfy building regulations, make sure your new boiler is A-rated or at least 88% efficient as judged by the Seasonal Efficiency of Domestic Boilers in the UK (SEDBUK) scale.
  • It’s a legal requirement that all are condensing models. The difference between a condensing and non-condensing boiler is the fact that condensing boilers convert more waste heat into energy, saving you money and helping the ecosystem.
  • If a boiler engineer deems your home unsuitable for a condensing boiler (this is quite rare), you will get a certificate to prove you can install a noncondensing mode.
  • Make sure you install proper heating controls along with your new boiler as per component L of building regulations. This means installing, at the very least, an excellent thermostat.
  • Choose between a standard system boiler and a combi boiler. System boilers have a cylinder to store hot water in and are great for large homes whereas combis heat water as needed and so don’t want a water tank. Consider a combi in case you reside in a small property

New Combi Boiler Installation Cost

Modern combi boilers are generally viewed as the most efficient and cost-effective boiler types for the average household. By heating only the water that’s needed as it is needed, waste is reduced to an absolute minimum and less energy is required to provide the home’s hot water.

In terms of costs, the actual boiler itself can be picked up from about £750 and up. Higher-end models stretch well over the £2,000 as too do the larger and more powerful combi boilers for larger homes and commercial/industrial use.

A new combi boiler is ideal for people who live in a little property since they are compact and fit in to small spaces. Unlike conventional boilers, combi-boilers don’t need a tank to store hot water, instead they heat on demand and come in gas, electric, and oil-fired versions. The cost of a new combi-boiler can vary between £800 – £2500 depending upon how large your system needs to be and where did you purchase it from. For instance:

A Vaillant combi boiler purchased straight from the producer prices between £796 – £1,400 + £600 for the installation cost.

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New Gas boiler installation cost


Even a standard gas boiler can represent an efficient option for heating and hot water provision. The average cost of heating a home using gas comes in at around the £500 mark, which is considerably lower than alternative fuels like oil, wood and electricity.

Buying a new gas boiler means handing over somewhere in the region of £600 to £800 for a standard unit, though again it’s possible to pay thousands for more powerful boilers.

Gas is the cheapest, most efficient type of heating fuel. The annual cost of running gas boiler comes to £735 when consuming around 12,500 kWh a year. Gas boilers are probably the most economic option  – with 69% of the UK households having one.

  • Replacing an existing gas boiler with a new boiler, in the same location cost around £2,000.
  • Installing a new gas boiler in different location costs around  £2,600.

New Oil boiler installation cost

If you live in a rural area, you may need to heat your home with an oil boiler, which costs more to install and run. For example:

  • A Grant Vortex Pro Outside gas combi-boiler costs £2, 310 plus between £600 and £1, 000 to match
  • According to Which? it costs an average of £1,100 to run an oil boiler annually.

New Electric boiler installation costs

Despite costing a little more to run, electric boilers remain both popular and in some homes essential. They tend to be much easier to set up and are cheaper to buy in their first place; it’s easy to see the appeal.

Electric boilers are a popular option in place of gas, and therefore are more affordable to set up, making them particularly great for newly converted properties.

  • A electric boiler prices range from £1,500 – £2,500 plus around £600 for installation
  • According o Which?, the annual cost of running an electric boiler comes to £1,800

Hiring a boiler engineer

It’s vital that you hire an experienced boiler engineer to install your new boiler; whichever kind you select:

  • Hire a Gas Safe engineer for gas boiler installation
  • A professional electrician will be able to put in your electrical boiler to British Standards 7671: 2008 Conditions for Electrical Installation
  • An OFTEC registered engineer can safely install, repair or service your oil boiler
  • Hire a HETAS registered engineer to set up a solid fuel burning boiler

Now let us look at the replacement techniques and costs for boilers

condensing-boilers-installation-costsThe cost to repair a boiler can range between £235 to £500, depending  on how many parts will need to be replaced ( burners, chimneys, lines or heat exchangers). The main reason behind repairs is the corrosion of boiler parts due to the fuel and water over some time of usage.

Boiler replacement is another option. On an average the boiler replacements cost something around £2,500. In the cost is included removing the old unit and wires, lines and ducts for proper functioning of the new device.

Replacing an oil boiler is relatively more expensive, as the oil tank needs to be replaced too and this increases the cost of the project. Now, let take a look at the potential costs of an oil boiler replacement.

  1. The boiler replacement cost comes on average to £2,500.
  2. It also important to check the boiler tank for leakages, which ads up to the initial removal cost.
  3. In case the boiler tank needs to be replaced the fee ranges between £700 and £1400, if the tank is placed above the ground and around £ 2,000, if the tank is placed bellow the ground.
  4. Checking the soil for leakage when the tank is located bellow the ground will cost you up to £300.
  5. Cleaning up and ground contamination will also cost you.

The tanks available now come with 30 years of replacement warranty and are made up of corrosion free material. Moreover, the replacement of tanks requires permit from the local fire department but you will need to present pictures in order to acquire the permit.

Cost to upgrade your boiler

You may also want to change your type of boiler once you have decided to go for replacement. If you have to change from oil based boilers to gas boilers which are more efficient you need to consider the following.

  1. Gas fired boilers cost up to £3,000 less than the oil based boilers.
  2. The oil needs to be transported to your house while gas is supplied through pipes which are easy.
  3. You need to get the gas hookup installed by your local company and or this trench should be dug for a line and a meter to your house. The charges for this would be £700 .
  4. The chimney will need an extra liner for the gas outlet and this will additionally charge £500. Additionally, the oil tank removal tips apply as stated in the earlier paragraph.

Though it seems like lot of money invested for switching from oil to gas, the billing will be quite less. Oil prices are unstable and hence can be very expensive with the changing market. Plus, the gas boilers are more environment friendly as they emit less carbon than the oil fired units.

Boiler Replacement or Repair?

Depending on how long you have been using the boiler, you need to decide whether it needs replacement or repair. An average time for a boiler to work efficiently is 20-30 years depending on the location and weather.

One must compare the cost of repairing and replacement while deciding. Repair can cost from £200-300, while replacement of oil fired and gas boilers will cost minimum £2,000-3,000 including the inspection, removal of old system and installation of the new boilers.

We hope our installation and repair guide with the information provided will prove useful for your next boiler maintenance and change considerations

Boiler installation grants

You may be able to get a grant towards the expense of installing your new boiler, keep an eye out for:

  • The Warm Front Scheme in England
  • The Warm Homes Scheme in Northern Ireland
  • Energy Supplier Grants
  • The boiler scrappage scheme
  • Local government grants


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