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A condensing boiler heats the water in your boiler by using some of the heat produced by the boiler, which would typically be released into the flue.
As a result, the boiler is much more effective and requires less energy to maintain hot water. The most popular type of condensing boiler is a gas combi boiler, but there are other types as well, including gas boilers that produce only heat.
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Condensing boilers are used in all newly manufactured gas combi and heat-only boilers which contributes to their extreme economy, and a boiler with a higher energy efficiency rating will result in lower gas prices.
Always go with a boiler that has an A or higher energy efficiency rating.
Let’s look at some of the top condensing gas boilers currently available. There are many excellent manufacturers to choose from, so competition is fierce, but some are superior to others.
Your top priority should be picking the best condensing gas boiler for your house and consequently these boilers are all in compliance with Boiler Plus.
In any manufacturer’s product line, a particular boiler will cost more the higher the output therefore how powerful your condensing combi boiler needs to be will depend on how big your house is.
You can choose a combi boiler with a lower output, typically up to 30kw, if your house is smaller and only has one bathroom. You might need a combi boiler that is more powerful than 30kw if your house is bigger.
This is to make sure it is capable of keeping all the radiators in your home hot and at the same temperature while supplying hot water to your taps with good pressure.
Viessmann Vitodens 050 25kw Combi – £860
Atag Economiser Plus 35kw Combi – £2,359
Wocester Bosch Greenstar 8000 Life 30kw Combi – £1,190
Vaillant ecoTEC Plus Combi 25kw – £1,112
Ideal Logic+ Combi 24kw – £880
These are all boilers from the top UK boiler manufacturers at the moment but remember to always compare quotes to make sure you get the best deals on condensing combi boilers. Only the best combi boilers, system boilers, and regular boilers are sold at Compare Boiler Quotes.
Now that nearly all new gas condensing boilers are hydrogen blend ready boilers as well, they are exempt from the ban on gas boilers in 2025. The boilers cost about the same, which is one of the best things about this.
Boiler Brand | Boiler Model | Boiler Type | Boiler Output | Energy Rating | Boiler Price |
---|---|---|---|---|---|
Viessmann | Vitodens 050-W | Combi Boiler (Condensing) | 29 kW | A Rated | £860 |
Viessmann | Vitodens 100-W | Combi Boiler (Condensing) | 30 kW | A Rated | £1,049 |
Viessmann | Vitodens 200-W | Combi Boiler (Condensing) | 30 kW | A Rated | £1,226 |
Viessmann | Vitodens 050-W | Combi Boiler (Condensing) | 35 kW | A Rated | £865 |
Viessmann | Vitodens 100-W | Combi Boiler (Condensing) | 35 kW | A Rated | £1,108 |
Worcester Bosch | Greenstar Junior 28i | Combi Boiler (Condensing) | 28kw | A Rated | £859 |
Worcester Bosch | Greenstar 28 CDi Compact | Combi Boiler (Condensing) | 28kw | A Rated | £978 |
Worcester Bosch | Greenstar 29 CDI Classic | Combi Boiler (Condensing) | 29kw | A Rated | £1,023 |
Worcester Bosch | Greenstar Highflow 440 CDi | Combi Boiler (Condensing) | 29kw | A Rated | £1,715 |
Worcester Bosch | Greenstar Highflow 29 CDi | Combi Boiler (Condensing) | 29kw | A Rated | £2,004 |
Worcester Bosch | Greenstar 30Si | Combi Boiler (Condensing) | 30kw | A Rated | £958 |
Baxi | 200 | Combi Boiler (Condensing) | 24 kW | A Rated | £633 |
Baxi | 100 | Combi Boiler (Condensing) | 24 kW | A Rated | £689 |
Baxi | 600 | Combi Boiler (Condensing) | 24 kW | A Rated | £711 |
Vaillant | ecoTEC plus | Combi Boiler (Condensing) | 25 kW | A Rated | £1112 |
Vaillant | ecoTEC Pro | Combi Boiler (Condensing) | 28 kW | A Rated | £880 |
Vaillant | ecoTEC Pro | Combi Boiler (Condensing) | 28 kW | A Rated | £1402 |
Vaillant | ecoFIT Pure | Combi Boiler (Condensing) | 30 kW | A Rated | £1001 |
Ideal | Logic Max | Combi Boiler (Condensing) | 24 kW | A Rated | £880 |
Ideal | Logic+ | Combi Boiler (Condensing) | 24 kW | A Rated | £880 |
Ideal | Vogue | Combi Boiler (Condensing) | 26 kW | A Rated | £950 |
Ideal | Logic Code ES | Combi Boiler (Condensing) | 26 kW | A Rated | £1,005 |
Ideal | Vogue Max | Combi Boiler (Condensing) | 26 kW | A Rated | £1,119 |
Potterton | Heatmax HE | Combi Boiler (Condensing) | 24 kW | A Rated | £720 |
Potterton | Promax HE Plus A | Combi Boiler (Condensing) | 24 kW | A Rated | £775 |
Potterton | Titanium | Combi Boiler (Condensing) | 24 kW | A Rated | £808 |
Potterton | Promax Ultra | Combi Boiler (Condensing) | 24 kW | A Rated | £963 |
Potterton | Assure | Combi Boiler (Condensing) | 25 kW | A Rated | £833 |
Vokera | Easi-Heat Plus 32C | Combi Boiler (Condensing) | 32 KW | A Rated | £550.00 |
Vokera | Easi-Heat Plus 25Ci | Combi Boiler (Condensing) | 25 KW | A Rated | £449.00 |
Vokera | Unica i32 | Combi Boiler (Condensing) | 32 KW | A Rated | £799.99 |
Every new boiler is condensing, just like combis. Having a separate hot water tank distinguishes a system boiler from other types of boilers.
This has no bearing on whether the boiler in question is a condensing boiler or not because it is the primary device in your home that pumps water to the faucets.
For larger homes with higher hot water demands, condensing system boilers are more appropriate. They can easily supply hot water to two or three showers simultaneously without experiencing any loss of boiler water pressure.
A larger home is typically more appropriate because it requires more space to house a hot water storage tank, which they have. Consider a condensing combi boiler for better efficiency if you live in a smaller house or a larger house but need to create some space.
If you already have a system boiler, it might be more economical to simply replace it with a new one rather than switching to a combi boiler. Expect to pay a fee to have all of this changed over if you want to switch to a combi. Given that most combi boilers are more cost-effective when used properly, it might be worthwhile in the long run.
Make sure the condensing system boiler you purchase is the appropriate size for your house. A higher output (KW) boiler is typically required for larger homes. This indicates that it can easily send hot water at the desired temperature to each radiator in your home.
You might need a system boiler with a 25kw capacity if your house is smaller. Larger homes would need an output of at least 26kw. In general, the price in each range is increased when the output is higher.
Take a look at our top 5 condensing system boilers
Boiler Brand | Boiler Model | Boiler Type | Output | Energy Rating | Boiler Price |
---|---|---|---|---|---|
Viessmann | Vitodens 100-W | System Boiler (condensing) | 26 kW | A Rated | £1,015 |
Viessmann | Vitodens 100-W | System Boiler (condensing) | 19 kW | A Rated | £1,046 |
Viessmann | Vitodens 100-W | System Boiler (condensing) | 30 kW | A Rated | £1,049 |
Viessmann | Vitodens 100-W | System Boiler (condensing) | 35 kW | A Rated | £1,099 |
Viessmann | Vitodens 200-W | System Boiler (condensing) | 19 kW | A Rated | £1,195 |
Viessmann | Vitodens 200-W | System Boiler (condensing) | 26 kW | A Rated | £1,298 |
Worcester Bosch | Greenstar 12i | System Boiler (condensing) | 12kW | A Rated | £825 |
Worcester Bosch | Greenstar 15i | System Boiler (condensing) | 15kW | A Rated | £855 |
Worcester Bosch | Greenstar 18i | System Boiler (condensing) | 18kW | A Rated | £890 |
Worcester Bosch | Greenstar 8000 Life | System Boiler (condensing) | 30kW | A Rated | £1,189 |
Worcester Bosch | Greenstar 8000 Life | System Boiler (condensing) | 35kW | A Rated | £1,362 |
Worcester Bosch | Greenstar 8000 Style | System Boiler (condensing) | 30kW | A Rated | £1,323 |
Worcester Bosch | Greenstar 8000 Style | System Boiler (condensing) | 35kW | A Rated | £1,405 |
Vaillant | ecoFIT Pure | System Boiler (condensing) | 25 kW | A Rated | £1059 |
Vaillant | ecoTEC Plus 624 | System Boiler (condensing) | 24 kW | A Rated | £1086 |
Vaillant | ecoFIT Pure | System Boiler (condensing) | 30 kW | A Rated | £1164 |
Vaillant | ecoTEC Plus 630 | System Boiler (condensing) | 30 kW | A Rated | £1190 |
Ideal | Logic+ System | System Boiler (condensing) | 15 kW | A Rated | £790 |
Ideal | Logic Max System | System Boiler (condensing) | 15 kW | A Rated | £875 |
Ideal | Vogue System | System Boiler (condensing) | 15 kW | A Rated | £910 |
Ideal | Vogue Max System | System Boiler (condensing) | 15 kW | A Rated | £925 |
Baxi | Megaflo Compact GA | System Boiler (condensing) | 12 kW | A Rated | £640 |
Baxi | Megaflo HE A | System Boiler (condensing) | 15 kW | A Rated | £669 |
Baxi | EcoBlue | System Boiler (condensing) | 18 kW | A Rated | £993 |
Baxi | EcoBlue | System Boiler (condensing) | 24 kW | A Rated | £1,055 |
There are so many condensing boilers available that you can always find a great boiler for an excellent price. Ideal & Viessmann manufacture some of the most cost-effective boilers.
They are reasonably priced, but not as good value for money as Worcester Bosch boilers, you’re probably wondering.
Condensing boilers are common in newly constructed homes in the UK. In the future, it is always a good idea to get a comparable boiler brand to compare new boiler prices, which you can do with our online calculator, which will give you fixed prices. We know that they are extremely efficient, so they meet any government guidelines regarding any carbon emissions. You might be surprised by the price of these new gas boilers, in our opinion.
For the majority of boilers, there are numerous heating controls available.
Voice recognition and heating capabilities powered by apps are two options for controlling boilers. Your home’s heating and hot water can be powered by Alexa, Google Nest & Hive, and other devices.
Along with voice and app controls, they also offer touch and electronic thermostats that make it simple to operate your new boiler and reduce your energy costs.
Click here to get a new boiler price online that is fixed. ✅
Stressed when needed a new boiler but easy process with affordable finance. New boiler installed within a few days with option for next day.
Paul Jones
On the day, they came on time. Lovely people, they kept everything clean. Explained everything to me. No mess, kept me informed.
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Great experience - quick to arrange, easy to work with the very responsive online team and all installed faster than expected.
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