Many UK homeowners are looking for a cheap boiler. Our guide ensures you also get a quality boiler with a great warranty.

The Best Cheap Boilers In 2021

Updated

Many UK homeowners are looking for a cheap boiler that will last them the next decade or longer. Finding a cheap boiler is easy, but finding a good quality one is a little bit harder. Fortunately, we’ve done the hard work for you, and the following guide will help you get a new boiler that is both affordable and likely to last the test of time.

What is the best cheap combi boiler?

Alpha E-Tec combi boiler

Alpha E-Tec 28kW

This Alpha boiler takes the no.1 spot in our review of the best cheap combi boilers. For most average-sized homes, this boiler will be more than adequate in heating and hot water output, and its compact dimensions enable it to be fitted inside a kitchen cupboard.

When installed by a quality installer, this boiler comes with a 10-year parts and labour warranty which is practically unheard of for a cheap combi boiler.

This boiler also came 3rd in our list of the best boiler brands overall, beating off competition from several much more expensive boilers. Highly impressive when you remember that this is one of the cheaper combi boilers to have installed.

Specification

Central heating output: 26.1 kW

Domestic hot water output: 28.3 kW

Hot water flow rate: 12.1 litres per minute @ 35 degrees

Dimensions (H,W,D): 712 x 440 x 255

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Other cheap combi boilers to consider

Ideal Logic Plus combi boiler

Ideal Logic plus 30kW

Ideal Boilers Logic plus range of combi boilers are built in the UK and boast some pretty impressive performance figures. Not quite as cheap as the Alpha E-Tec, but as cheap combi boilers go, they’re up there with the best cheap combi boilers.

It is possible to get this and other ideal boilers with a 10-year warranty depending on the installer you choose, so there’s peace of mind with this boiler as well.

Specification

Central heating output: 25.6 kW

Domestic hot water output: 30.3 kW

Hot water flow rate: 12.4 litres per minute @ 35 degrees

Dimensions (H,W,D): 700 x 395 x 278

Viessmann Vitodens 050-W combi boiler

Viessmann Vitodens 050-W 29kW

Viessmann is known for making good quality boilers and is fast becoming one of the leading brands in the UK heating market.

The Vitodens 050-W is their attempt at a cheap combi boiler, and first impressions are pretty good.

There are several installers out there offering this combi boiler with a 10-year warranty, and the specification of the boiler is quite good.

The only thing to watch out for is the boiler size in terms of depth, especially if you’re planning to get it installed into a kitchen cupboard.

Specification

Central heating output: 24 kW

Domestic hot water output: 29.3 kW

Hot water flow rate: 12.0 litres per minute @ 35 degrees

Dimensions (H,W,D): 707 x 400 x 350

Worcester Bosch Greenstar 2000 combi boiler

Worcester Bosch Greenstar 2000 25kW

One of the leading boiler brands, Worcester, has also introduced a new cheap combi boiler into the market.

At 25kW, this combi boiler is a little less potent than the other cheap combi boilers on this list, and the hot water flow rate is not quite as powerful as a result. However, in a single bedroom flat, this might not make much of a difference.

The boiler is nicely designed with curved edges and an attractive round controls display on the front casing, so it could be a good option where the boiler will be out on show.

Depending on who carries out the combi boiler installation, you will get a five or 6-year warranty, which is good for a cheap combi boiler, but it lags behind the others in our list above.

There is a 30kW version of this boiler available, but this boiler is more expensive, and in our opinion, the cost gets too close to the superior Worcester Bosch Greenstar 4000 Combi boiler, which has a higher specification and longer warranty.

Specification

Central heating output: 20 kW

Domestic hot water output: 25 kW

Hot water flow rate: 9 litres per minute @ 35 degrees

Dimensions (H,W,D): 724 x 400 x 300

Best cheap regular (heat only) boiler

For homeowners who want to stick with their regular boiler and hot water cylinder, there are some great options to upgrade your home’s energy efficiency and save money while ensuring your home stays nice and warm.

Worcester Bosch Greenstar Ri Regular boiler

Worcester Bosch Ri 15kW (small to medium homes)

Of course, we know Worcester Bosch boilers are known for being high quality, but did you know they also have some competitively priced gas boilers?

The Worcester Bosch Ri range of heat only boilers are competitively priced and compact enough to fit inside a kitchen cupboard if required.

Depending on the installer you choose, they are also available with a 10-year warranty.

Specification

Central heating output: 15 kW

Domestic hot water output: not applicable

Hot water flow rate: not applicable

Dimensions (H,W,D): 600 x 390 x 270

Worcester Bosch Ri 30kW (large homes)

For larger homes, there is a 30kW version of the Worcester Bosch Ri heat only boiler.

Despite its significant additional power, the 30kW is the same physical size as the 15kW version and will still happily fit inside most kitchen cupboards.

Similar to the 15kW version, this boiler will come with up to 10 years warranty.

Specification

Central heating output: 15 kW

Domestic hot water output: not applicable

Hot water flow rate: not applicable

Dimensions (H,W,D): 600 x 390 x 270

Note: for homes with even larger heating requirements, there is a 35kW version available, but make sure you check things out with your installer to ensure you get the right size boiler for your home.

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Best cheap system boiler

If you currently have a system boiler and are interested in getting a like for like new boiler replacement on a budget, here are the best cheap boilers on the market at the moment.

Worcester Bosch 4000 System boiler

Worcester Bosch Greenstar 4000 18kW System boiler

Priced to compete with cheap boilers whilst delivering premium quality performance, the Worcester Bosch 4000 range of system boilers are a compelling option.

With a 10-year warranty available when you pick top quality installer, and a great modern design, you can rest assured that you will be happy with this boiler.

Specification

Central heating output: 18 kW

Domestic hot water output: not applicable

Hot water flow rate: not applicable

Dimensions (H,W,D): 724 x 400 x 310

To cater for homes with larger heating requirements, there are also 21kW and 24kW versions available.

Viessmann Vitodens 100-W system boiler

Viessmann Vitodens 100-W 19kw System boiler

Viessmann’s 100-w range of boilers are made in Germany and have recently had a design refresh for 2021.

This is a system boiler to consider with a 10-year warranty, the famous Viessmann inox-radial heat exchanger, and a sleek new design.

It is currently being sold at a competitive price, which means you should probably get a quote for one sooner rather than later before they potentially increase their boiler prices.

Specification

Central heating output: 19 kW

Domestic hot water output: not applicable

Hot water flow rate: not applicable

Dimensions (H,W,D): 700 x 400 x 360

As with the Worcester 4000 System boiler, this Viessmann boiler is available in various outputs to suit all property sizes. The best way to find out which output is best for you is to visit the likes of Heatable, who’ll consider the size of your property and the number of bathrooms before making a recommendation – all in under a minute!

boiler installation costs

Installation costs

It’s important to remember that boiler prices are just one part of the puzzle. There are boiler installation costs to consider as well.

A quick google of boiler prices can lead homeowners into thinking they could save money by buying a new boiler first and then finding an installer later. However, this often leads to disaster, and so we strongly recommend getting a fixed price for the boiler installation, which fully covers all installation costs.

The boiler itself makes up only around 30-50% of the installation costs, with the rest coming from the materials which are required to carry out the boiler installation and the labour provided by the gas safe registered engineer.

The average labour and materials bill (excluding the boiler) will amount to around £1200.

Combi boiler installation prices also tend to be slightly higher if you are changing from a regular boiler due to the likelihood of gas pipe upgrades being required.

Extras such as thermostatic radiator valves or the latest smart heating controls will also add cost to the installation.

These days, the best way to find out how much your boiler installation will cost is to get a fixed price from a specialist online installer.

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how to save money on your new boiler installation

How to save money on new boiler installation

By now, you’ll have a good idea of how to identify the best cheap boilers, and you are looking to get one installed, the next thing to do is get some pricing information.

Right now, the best way to save money, whether it’s a combi boiler or a regular or system boiler, is to get yourself a quote from one of the online boiler installation firms.

These online firms operate with lower costs, and because they install a high volume of new boilers, they have good relationships with boiler manufacturers, which ultimately means they can pass the savings back to the customer.

The exciting thing about using one of these companies is that local, vetted heating installers carry out their boiler installations. The same group of heating installers would probably charge you significantly more for the same job had you approached them directly for a quote.

Not only will you save on the boiler purchase, but you will also benefit from a longer warranty, as it’s usually only the installers fitting high volumes of new boilers who can get access to extended warranty’s.

Cheap boilers frequently asked questions

What is the cheapest boiler to run?

These days boilers, by law, are A-rated and condensing as a minimum. Therefore there isn’t much of a difference in running costs from one boiler brand to another. A combi boiler may help you save a little bit over a boiler with a cylinder, but it’s not a huge difference.
You can check out the Energy Saving Trust website if you would like some independent information on heating running costs across different boilers.

Are combination boilers cheaper?

Combi boiler prices are a little bit more expensive to purchase than regular or system boilers simply because they are designed to provide both heating and hot water for the home. In terms of running costs, a combi boiler may work out marginally cheaper to run since hot water is only heated “on-demand” rather than heating a large hot water cylinder the same way regular and system boilers do.

How can I get a cheap combi boiler installation?

Several online providers such as Boxt and Heatable can give you new combi boiler installation prices within as little as one minute, and because their overheads are lower, they can often offer cheaper installations.

How much is a boiler from British Gas?

The best way to find out what British Gas charges for a new boiler is to ask them for a quote. They aren’t known for being the cheapest. However, they’re a good quality installer, and perhaps with increased competition from the new online boiler installation companies, they may have revised their pricing a little bit. It’s worth noting that British Gas offer boiler finance on new installations to make it more affordable.

Are budget boilers any good?

There is nothing wrong with boilers, but you must consider the boiler’s performance. Buying a boiler that is too small to provide adequate heating for your home just because it’s cheaper would be a big mistake. It’s also important to consider the warranty, as a budget boiler with a short warranty could end up costing you more in future if repairs are required.

Which is the cheapest combi boiler?

Alpha E-Tec 28 kW. Not only is this combi boiler cheap, but it also happens to be one of the best cheap combi boilers due to the high-quality components it is built with and the long manufacturer warranty.

Which is the cheapest boiler?

Alpha E-Tec 28 kW. Not only is this combi boiler cheap, but it also happens to be one of the best cheap combi boilers due to the high-quality components it is built with and the long manufacturer warranty.

Which system boiler is best?

The Worcester Bosch Greenstar 4000 18kW system boiler meets most average homes needs. It is available at a very reasonable price for a high-performance system boiler from one of the leading boiler brands. Your fuel type also plays a part in this as not all system boilers are available for oil and LPG.

What size boiler do I need for a 4 bedroom house?

Each homes needs are different, and so the best way to find out what size of boiler you require is to contact a heating installer who can advise you on the most suitable boiler output. They can also assist you with picking the right heating controls and picking the best boiler brand for your specific boiler use.

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