How Much Does a New Boiler Cost?

If you’re thinking about installing a new boiler and want to get an idea of how much it will cost, you’ve come to the right place.

Below you’ll find detailed information about boilers, including price examples. We can also help you get a competitive quote here.

On this page, we’ll try to answer these questions:

  • Can an old boiler be swapped for a new one on a like-for-like basis?
  • How long does it take to replace a boiler?
  • What work is involved with replacing a boiler?
  • How much do boilers cost to buy from a supplier and what is the going rate to install one?

While we originally created this page back in 2014, we last updated the prices and information on the .

Can a Boiler be Swapped Like-For-Like?

Contrary to what many homeowners assume, it isn’t always possible to remove an old boiler and replace it with a new one of the same or similar type.

Since 1st April 2005, all new gas boiler installations should be done with condensing boilers:

The replacement of a gas boiler will probably have to be a condensing boiler unless there is sufficient reason why one cannot be installed.

Planning Portal website

Condensing boilers are more energy efficient but they may require some extra work during the installation process:

  1. A drainage pipe must be installed to take away the small amount of wastewater a condensing boiler produces. This pipe is normally inserted through an external wall and connected to an external drain. This could be a simple job, or it could take several hours.
  2. If you want to replace the entire system, the boiler and radiators. The regulations state you should also install new thermostat valves on each new radiator, with only a few exceptions. These valves are so the occupant can adjust the temperature of each room.
  3. Depending on the age of your property and the condition of the pipework, a new gas pipe may need to be fitted between the meter and the boiler; this is to comply with new rules regarding allowable pressure drops between the gas meter and the appliance. Homes built after the year 2000 typically have the correct larger diameter pipe fitted.

Our Updated Price Guide – The Cost to Replace a Boiler in 2018

In March 2018, we asked dozens of gas boiler installers to give us a price to replace a boiler.

As you can see from the examples below, there is a huge difference between the prices we were given.

We found a vast gulf between what the big firms like British Gas were charging and that of smaller local businesses.

All of the quotes below were for the same boiler.

Project 1 – New Condensing Boiler

For this project we wanted our old boiler replaced with a new condensing one in the same location.

We wanted to keep the original thermostat and wall controls as they’re fairly modern and we saw no reason to replace them.

LocationSmall Business /TraderLarge Business (5+ employees)
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London Area£2750.00£3350.00
South, SW and Midlands£2250.00£3000.00
Outer Region and North£2150.00£3000.00




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Project 2 – Optional Extras

When sourcing prices, we also took the opportunity to ask our chosen firms how much it would cost to have extra work done.

The figures below are an average of the prices we were given:

  • New TRV (Valves) on all radiators, supply and fit – £35 each
  • New wall thermostat control panel – £250 assuming the existing wiring is sound and in place
  • Magnetic filtration system to remove rust and sludge – £275
  • System flush, this is recommended with new boiler installations – £500 (also see our guide to power flushing costs here)
  • New hot water cylinder tank – £400
  • The cost to install a new radiator – £350
TRV costs (thermostatic valves for radiators

TRVs (thermostatic valves for radiators)

Can You Really Pay Off The Cost of a New Boiler in X Years?

We’ve all seen the claims made by boiler manufacturers and installers; condensing boilers are worth the investment and you’ll save so much money that in X years you would have saved more than you initially spent on the boiler.

But is this true or just marketing material?

According to the independent consumer service uSwitch; a typical homeowner can save between 11% (£79) and 33% (£237) per year by replacing an old inefficient boiler with a new modern condensing system.

That means you could pay off the initial cost in just nine years.

Some homebuyers also consider a new boiler to be an asset, so a new boiler could also be a great selling point.

How Long Does it Take to Replace a Boiler and How Much do They Cost From a Supplier?

Direct Heating Supplies is a great website for checking supply-only prices, they also sell boiler packs that include the flue and drainage pipe. Most boilers suitable for 3-bed homes cost between £800 and £1200.

It normally takes around a day to replace a boiler. Allow more time if you want any of the extras listed above included in the work.

Consider Modern App-Enabled Controls

We didn’t want the control panel or wall thermostat replaced as ours was fairly new.

There are advantages to modern wi-fi enabled controls:

  • No wires between the wall thermostat and the control panel
  • You can change when the boiler comes on and goes off via a mobile app, wherever you are
  • get reminders to switch the heating or hot water on
  • You can monitor how many hours the boiler is on for

Having a modern set of controls can save you money on the heating bills and give you much flexibility.

If you’ve never considered app-enabled central heating controls, start by checking out Hive from British Gas.

Control your boiler from your phone

Get a Quote For Your New Boiler Today

We recently teamed up with Rated People – a UK website for sourcing new boiler prices, quotes and estimates.

You can obtain written quotations from reputable and qualified plumbers local to you.

Rated People is so easy to use (and free):

  • Tap the button below and fill in the form
  • Read reviews from local boiler installers
  • Get up to three quotes for you to consider
  • Leave your own feednack when the boiler installation is finished
Click Here to Get Your Free Plumbing Quote

Not ready to get quotes? See all of our cost guides here

4 Responses to “How Much Does a New Boiler Cost?”

  1. TarkersFebruary 5, 2016 at 6:35 pm #

    Great website! Our house has an old back boiler fitted in the living room chimney breast and a tank fitted in an upstairs airing cupboard (next to exterior wall). Anybody with any ideas on a rough cost to replace with a nice new combi?

    Greatly appreciated 🙂

  2. JustinNovember 1, 2016 at 7:58 pm #

    Who writes this crap? I suggest you do your homework. Thermostatic valves are NOT a requirement unless you are having a complete new system when you change a boiler. A full programmer is mandatory, a room thermostat is mandatory too. If the cylinder is of a certain age ( yellow lagged or NO lagging) then that’s supposed to be changed too

  3. Ridley FitzgeraldMay 10, 2017 at 8:34 pm #

    It’s good to know about getting a new boiler. I don’t mind spending a little more to get a condensing boiler, especially if it is more efficient. Our energy bill is too high anyway, so we’ve been looking for ways to lower it.

  4. bob the builderNovember 29, 2018 at 2:35 pm #

    fucking greedy bastards are over the top paying money like you qouted above what am i getting gold plated taps and boiler it should be for them prices.

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