Boiler Replacement Cost Explained – How to Avoid Being Ripped Off?

If you’re on the market for a new boiler, you need to read our dedicated boiler replacement cost guide to know what to expect.

We’ll answer the question “how much does a replacement boiler cost?” as well as review your options for getting it done in a timely, cost-effective manner.

Boiler Replacement Cost explained

How much does a new boiler cost, anyway? With so many providers and options on the market, you’re probably at least a bit confused. I mean, how do you choose between British Gas, Help-Link, local Gas Safe installers or quote comparison websites, since everyone promises the best prices?

Luckily, we’ve done the research for you. With today’s replcament boiler guide, you can make an informed decision on the boiler brand, model, financing options, installation company–and whether you even need a replacement in the first place.

Need a New Gas Boiler Quote Right Away? Try Heatable.
Go get an exact quote in 90 seconds by filling Heatable’s online quotation form — which we’ve found offer the best service by installing Worcester Bosch boilers for fixed prices starting at £1,595.

Heatable new boilers

How Much Does it Cost to Replace a Boiler?

The costs of replacement boilers can be influenced by SO many factors. But since I know for sure you’re more interested in actual numbers, here is a rough estimate of costs based on a reputable boiler brand in the 24-30kW range.

New Combi Boiler Replacement Cost: £1,900-£2,300

How much is a combi boiler, delivered and installed? Well, it depends…

If you’re planning to install your new combi boiler in the exact same spot its predecessor occupied, then you’ll pay somewhere around £1,900 for the entire job.

On the other hand, if you plan to move the boiler to a new location in your home, be ready to part ways with a few hundred quid more. Because of the inherent complexity of relocating a heating system’s infrastructure, you can expect to pay at least £2,300 for this project.

If you’re lucky enough to live in London, you can add about 8-10% to the figures above to get your ballpark estimate.

Standard Gas Boiler Replacement Cost: £1,900-£2,350

If you feel that a regular boiler is the more fitting option for your household, good news — you should be able to get one for the same price as the smaller combi, roughly £1,900.

That said, your relocation will cost around £50 more, just because regular boilers are more cumbersome and their installation demands more time and effort. Again — Londoners, sorry, but you’ll have to tack on an extra £100-£150 to these numbers.

What kind of fuel does your boiler use?

Fixed price online with next day installation

Worcester boilers from as little as £1,965.

Costs of Conversion to a Combi Boiler or System Boiler: £2,700-£3,200

Upgrading to a combi or system boiler costs quite a bit more than a one-for-one replacement. If you currently have a regular or back boiler, the infrastructure upgrades needed to accommodate a combi can easily add an extra £1,000 to the overall replacement costs. Here’s a quick summary of what you can expect to pay for such an upgrade (new gas boiler included):

Work RequiredBoiler TypeCost
Central heating system upgrade to a combination boiler (including removal of hot water tanks)Regular Boiler£2,850
Back Boiler£3,200
Upgrade to a system boiler (retaining hot water tanks)Back Boiler£2,700

New Boiler Replacement — Cost Comparison

Most local Gas Safe installers will quote you more or less what you see in the table above. I know some of you might say that large national installers can sometimes give you better prices considering their discounts on the purchase cost of the boiler itself. While that is somehow correct, it doesn’t take into account the high overheads of these companies with fitting costs skyrocketing to the roof.

That’s why we need to compare apples with apples. To give you an idea of what you should expect when working with a larger scale provider of boiler replacements, we decided to take a deeper look into what British Gas, Heatable and Help-Link can do for you. They are not ranked in any way, so seeing BG here first doesn’t mean they are the best or worst, cheapest or most expensive.

Get your fixed boiler prices on-screen after filling out a short survey about your home on the Heatable website.

British Gas Boiler Replacement Prices

British Gas have been installing boilers for more than 50 years. They promote themselves as the company who “fit more boilers than anyone else in the UK”. Other than a range of gas boilers that are exclusive to British Gas, they have connections with top manufacturers and also install Worcester Bosch, Vaillant or Glow-worm boilers.

But that doesn’t mean you’ll be getting the best offer. In fact, people often talk about them as the most expensive in the market — as in, expect to pay a 40-50% “fee” to have a British Gas new boiler installation.

It’s quite easy to understand why BG will quote you higher than other companies in the market. They invest a lot in marketing — all those adverts with cute animals or the spinning planet you see on TV must be paid by someone — plus have a lot of overhead costs that they must charge onto the final consumer. While we don’t fully agree, many go so far as to consider British Gas boiler replacement a rip off altogether due to this reality.

And if you needed more proof, Help-Link, which are a direct competitor, promote to save you ~ £1,081 compared to British Gas. Heatable undercuts that even more.

Heatable Boiler Installation Cost Calculator

How would you like to save more than £1,000 by installing a high-quality Worcester Bosch boiler with 10-year warranty included, and get a FREE WiFi thermostat with all selected combi boilers? Sounds like a great deal, no?

A little bit of background to understand how this is possible. Heatable have shaken the boiler replacement industry by providing a highly technical online solution that quotes you fixed prices for your job, as low as a local Gas Safe heating engineer. We went through their quoting process — takes less than 90 seconds — and found out that their solution gives lots of different boiler prices  — about 10 in total for the 3-bedroom property we queried for.

To get a rough idea we answered the Heatable form in such a way that no additional work would be required except for the Worcester Bosch 25i to swap the old boiler we had. The cost was £1,649 with installation, which is nothing short of amazing. Of course, you could scroll and get the 30i which is a Heatable “Best Buy” and overall the most popular unit in the UK, but you’ll need to add some more ££.

Check out on-screen boiler installation costs using this quick form (no contact details needed).

HEATABLE Worcester Bosch Greenstar i 30kW

Get your fixed boiler prices on-screen after filling out a short survey about your home on the Heatable website.

Help-Link replacement costs

Help-Link provides online quotes for new boiler installs. Their online form is just as simple as Heatable–but with a twist. It won’t put prices in front of your eyes at the end unless you give them personal info such as phone number or email. I found this a bit annoying but went on.

The form was filled in with all the simplest info so that it’s only a boiler swap rather than a new system with all sorts of upgrades. The results didn’t impress us. I mean, we’re looking at just over £2,100 for an Ideal boiler with a 5-year warranty, and just over £2,600 for the Worcester with 10-years warranty.

That’s more expensive than the other option we tried, Heatable — which is quite ironic.

If You Compare Boiler Prices Directly, Heatable Has it

Large national installers will always be more expensive than local installers. The alternative is quote comparison site, Heatable, where you get a fixed price so you don’t have to worry about upgraded controls, boiler filters, and more. They also promise hassle and mess-free installation, the next day you order (or whenever you choose).

When Do I Need a New Boiler?

It’s not just you — many people ask themselves “How to tell if my boiler needs replacing?”.

The answer is not as simple as you may think, mainly because of the misconceptions that when a boiler is of a certain age it needs to be replaced. Just like people, if you take care of them, boilers can live well into old age.

We’re not saying you should do that – sometimes there’s no alternative, and you must buy a new boiler. If you check many of the things below, then it’s a clear sign replacement is needed:

  1. Bills are exploding — it’s not just service and repairings; with an A-rated boiler you could save around £200 a year and help the environment
  2. Often breakdowns — one of the reasons for higher bills
  3. Boiler leaks and the cost of getting it back in shape is not worth the investment
  4. Replacement parts are hard to find — your boiler is probably very old
  5. Boiler or radiators are noisy — this may be fixable, but it may be that you need to weigh up what you’re spending
  6. Blue flame, now yellow — a sign that a Gas Safe engineer should pay you a visit, immediately.

Get your fixed boiler prices on-screen after filling out a short survey about your home on the Heatable website.

Boiler Replacement Cost FAQ

Which is the best boiler to buy in 2022?

We recommend Worcester Bosch boilers. The Greenstar 4000 combi boilers rank highest on our list, although they also have regular and system boilers that are worth considering. That’s because they are the most reliable brand throughout the UK market.

That said, other excellent boiler brands include Viessmann, Ideal Boilers, Vaillant, and Baxi — all of them manufacture quality boilers.

How long should a boiler last?

On average boilers should last 10-15 years. If they are older or out of warranty, or if you constantly get repair bills to bring it back in shape, it might be wiser to have it replaced with a newer, A-rated model. Since new boilers boast higher energy efficiency, buying a new boiler will also help you save on energy bills.

How much does it cost to replace a boiler in a house?

From our research, the lower end is just around £1,795 for combi boiler installation with 10-year warranty included, while larger properties that require larger boilers could extend to £2,500.

How long does it take to change a boiler?

It depends on the complexity of the job: 1 to 3 days. A simple swap with no new upgrades shouldn’t take more than 1 day. However, if you need to upgrade the pipework or you’re replacing a combi boiler or a central heating system it could take up to 3 days.

Is British Gas a rip-off?

It’s not fair to call British Gas a rip-off. But, it’s a fact that their installation works are more expensive than local installers or online businesses such as Heatable where overheads won’t inflate your price without the need of it.

How can I get a boiler for free?

You could receive a free ECO (Energy Company Obligation) grant if you meet certain criteria. Typically it’s only pensioners who get a boiler for free via the ECO scheme. Read more about getting British Gas boiler grants in 2022.

New Boiler Prices: Parting Words

There you have it: Our guide to how much it actually costs to get a new boiler for your heating and hot water systems. There are three main ways to make it happen via British Gas and Help-Link, but Heatable has the lowest prices and quickest service.

Do you have any questions remaining about boiler replacement prices? What experience do you have with any of the three options we’ve covered here today?

Leave a comment below!

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