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Combi Boiler prices can vary hugely and depend on numerous factors, home size, output, brand, warranty, etc… but generally you can expect to pay anywhere between £500 to £1,500 for a new Combi Boiler—plus extra for installation.
When choosing a new Combi Boiler it’s important to get the right size and power output (kW output) relative to your home, this will ensure your Combi Boiler can sufficiently support your home’s heating needs.
Our ‘Combi Boiler Installation Price Guide’ lists suitable Combi Boiler options (for specific home sizes) together with particulars, allowing you to compare models, warranties and prices—we also detail certain installation (only) scenarios (see Combi Boiler Installation Prices) allowing you to gauge expected installation prices.
* This guide was designed to give you a quick idea of expected Combi Boiler and installation prices, however, we’d always recommend you seek advice from a qualified installer with regards to boiler size and output.
The following Combi Boilers are suitable for homes with up to 1-2 bedrooms (24 kW to 27 kW Output).
| Brand/Model | Size/Output | Efficiency | Warranty | Price |
|---|---|---|---|---|
| Brand: Biasi Inovia Combi | Size/Output: 25kW | Efficiency: A | Warranty: 5 years | Price: £610 |
| Brand: Baxi 200 Combi | Size/Output: 24kW | Efficiency: A | Warranty: 3 years | Price: £630 |
| Brand: Glow-worm Energy Combi | Size/Output: 25kW | Efficiency: A | Warranty: 7 years | Price: £790 |
| Brand: Vaillant ecoTEC Pro Combi | Size/Output: 24kW | Efficiency: A | Warranty: 2 years | Price: £884 |
| Brand: Ideal Vogue Max Combi | Size/Output: 26kW | Efficiency: A | Warranty: 10 years | Price: £1,109 |
The following Combi Boilers are suitable for homes with up to 3-4 bedrooms (28 kW to 34 kW Output).
| Brand/Model | Size/Output | Efficiency | Warranty | Price |
|---|---|---|---|---|
| Brand: Biasi Riva Plus Combi | Size/Output: 28kW | Efficiency: A | Warranty: 2 years | Price: £514 |
| Brand: Ferroli Modena HE Combi | Size/Output: 32kW | Efficiency: A | Warranty: 5 years | Price: £635 |
| Brand: Glow-worm Energy Combi | Size/Output: 30kW | Efficiency: A | Warranty: 7 years | Price: £850 |
| Brand: Ideal Logic Max Combi | Size/Output: 30kW | Efficiency: A | Warranty: 10 years | Price: £965 |
| Brand: Vaillant ecoTEC Plus Combi | Size/Output: 32kW | Efficiency: A | Warranty: 5 years | Price: £1,250 |
The following Combi Boilers are suitable for homes with up to 4+ bedrooms (35kW to 42 kW Output).
| Brand/Model | Size/Output | Efficiency | Warranty | Price |
|---|---|---|---|---|
| Brand: Biasi Inovia Combi | Size/Output: 35kW | Efficiency: A | Warranty: 5 years | Price: £658 |
| Brand: Ferroli Modena HE Combi | Size/Output: 38kW | Efficiency: A | Warranty: 5 years | Price: £791 |
| Brand: Ideal Logic+ Combi | Size/Output: 35kW | Efficiency: A | Warranty: 7 years | Price: £1,011 |
| Brand: Baxi EcoBlue Advance Combi | Size/Output: 40kW | Efficiency: A | Warranty: 10 years | Price: £1,250 |
| Brand: Vaillant ecoTEC Plus Combi | Size/Output: 38kW | Efficiency: A | Warranty: 5 years | Price: £1,500 |
You’d be right in thinking that Combi Boilers are cheaper than Regular Boilers (sometimes known as traditional, conventional or heat-only boilers) to install, this is thanks to less elements reducing the work involved, plus a Combi Boiler doesn’t need to be connected to a hot water cylinder or feed tank in the attic, and can be pretty much installed anywhere in your home.
If you’re looking for a quick change of Combi Boiler and require a replacement installed in the exact same spot, then expect to pay on average between £500–£700, should the upgrade/replacement be located elsewhere then costs typically range from £1,500–£1,800.
If the installation is more complex, for example you’re looking to swap a Conventional Boiler for a Combi then expect to pay more, this type of install takes longer as pipes will need to be re-plumped and the water tank and storage cylinder will need to be removed.
The table below provides a quick idea of general Combi Boiler installation prices (only) along with typical installation scenarios.
| Scenario | Price |
|---|---|
| Scenario: Replacing a Combi Boiler with a new Combi Boiler in the same location | Price: £500–£700 |
| Scenario: Replacing a Combi Boiler with a new Combi Boiler in a different location | Price: £1,500–£1,800 |
| Scenario: Replacing a System Boiler with a new Combi Boiler | Price: £2,000–£2,700 |
| Scenario: Replacing a Regular Boiler with a new Combi Boiler | Price: £2,600–£3,000 |
Combi Boilers are clearly a great option if you want extra space in your home and you aren’t asking your boiler to produce heat to multiple outlets around your home at peak times of the day.
If you do make the decision to opt for a Combi Boiler, then how do you know when is the right time to have your new heating system installed?
While you may be forced into replacing your boiler urgently should your existing boiler stop working for whatever reason, it is probably best to install your Combi Boiler alongside general refurbishment to the rest of your home. This means the installation can be carried out more easily if there are additional radiators or water pipes required ensuring your new heating system works efficiently. You can even make further savings on your energy bills by improving insulation around your home, ensuring that you don’t need to heat the house for as long because there is less chance that heat will escape.
Finally, we would also recommend having your Combi Boiler set up in plenty of time for the cold winter months, when you are most likely to need your boiler to be in good working order. This ensures that you get a good deal on plumbing and the best Combi Boiler installation prices, as demand on this service naturally increases as the temperatures plummet.
Popular independent consumer magazine Which? well known for testing and reviewing household products (including Combi Boilers), exists to give unbiased advice to consumers helping them to make informed decisions on purchases.
The following tables list the top three recommended ‘Combi Boiler Brands’ and ‘Best Buy’ Combi Boilers (by Which? for 2018, 2017 respectively). The results were achieved by surveying over 10,000 boiler owners and engineers nationwide to find the most reliable and easiest to maintain Combi Boilers.
Best Combi Boiler Brands
| Title | Boiler | Rating | Price |
|---|---|---|---|
| Title: Best Brand Overall | Boiler: Worcester Bosch Greenstar 25i ErP | Rating: 86% | Price: £875 |
| Title: Most Reliable | Boiler: Viessmann Vitodens 100-W Combi 26kW | Rating: 83% | Price: £913 |
| Title: Engineers Favourite | Boiler: Vaillant ecoTEC exclusive Green iQ 835 | Rating: 80% | Price: £1,400 |
‘Best Buy’ Combi Boilers
| Brand/Model | Rating | Price |
|---|---|---|
| Brand/Model: Worcester Bosch, Greenstar 25i ErP | Rating: 86% | Price: £875 |
| Brand/Model: Worcester Bosch, Greenstar 25Si Compact ErP | Rating: 86% | Price: £967 |
| Brand/Model: Viessmann, Vitodens 050-W 29 | Rating: 83% | Price: £1,018 |
| Brand/Model: Viessmann, Vitodens 200-W Combi 26kW Weather comp | Rating: 83% | Price: £1,290 |
| Brand/Model: Vaillant, ecoTEC plus 835 | Rating: 80% | Price: £1,244 |
| Brand/Model: Vaillant , ecoFIT pure 825 | Rating: 80% | Price: £1,100 |
* Need advice on your new Combi Boiler? then complete our Quick Quote Form, we'll then arrange for someone to contact you to discuss your requirements and budget further.
