Condensing Boiler Reviews

Condensing Boiler Review
Condensing Boiler Review


Welcome to our Condensing Boiler Reviews page!

According to a recent Heatable article here’s a summary of the best Condensing Boilers of 2021, 2022 and beyond.

Review of the Best Condensing Boilers of 2021, 2022 and Beyond (By Brand)

1 – Worcester-Bosch Combi Boilers

2 – Viessmann Combi Boilers

3 – Vaillant Combi Boilers

4 – Alpha Combi Boilers

5 – BAXI Combi Boilers

Best Condensing Boilers (By Model)

Best Condensing Boilers – Conclusion

Advantages of Condensing Boilers

Condensing boilers are super clever, super at saving energy and super at saving money.

Considering condensing?

Here are the best condensing boilers of 2021, as according to Boiler Comparison website Heatable’s recent review:

Did you know that every year, more than 1 million new boilers are installed into UK homes?

That’s an incredible amount of boilers, and thanks to the introduction of ‘Boiler Plus’ legislation back in 2005, all new installs are now condensing boilers that are a huge improvement on the inefficient non-condensing models of the past. 

But what exactly is a condensing boiler?

Condensing boilers are water heaters fueled by gas or oil. These boilers achieve a high-efficiency level (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted.

This condensed vapour leaves the system in liquid form, via a drain.

In many countries, the use of condensing boilers is compulsory or encouraged with financial incentives.

And how do you know why condensing boiler to choose?

See the summary of the Heatable article and guide for the best Condensing Boilers of 2021, 2022 and Beyond.

Review of the Best Condensing Boilers of 2021, 2022 and beyond (By Brand) 

To determine the best boilers available in 2021 and beyond, Heatable considered the following factors: 

  • Warranty period offered by the brand 
  • The overall reputation of the brand based on customer reviews 
  • The brands Trustpilot reviews  
  • Awards and accolades e.g. Which? Best Buy Awards etc.
  • Customer service performance levels 
  • The price range of the boilers  
  • Boiler efficiency ratings

Based on the results, here are the top 5 best condensing boiler brands in the UK right now (on 2021 results):

  1. Worcester Bosch Combi Boilers
  2. Viessmann Combi Boilers
  3. Vaillant Combi Boilers
  4. Alpha Combi Boilers
  5. BAXI Combi Boilers

Review of the Worcester Bosch Combi Boilers (Best)


One of the UK’s most well-known and trusted boiler manufacturers, Worcester-Bosch <<Link>> remains a favourite among professional Boiler installers and heating engineers.

Why did Heatable think Worcester-Bosch deserved the number one spot? 

  • Which? Best Buy Award for 10-years running 
  • 10-year guarantee
  • Availability of parts is second to none 
  • Excellent customer reviews & aftercare
  • High-efficiency A-rated combi boilers 

Review of Boiler Model: Worcester-Bosch Greenstar i


The Worcester-Bosch Greenstar i is officially Worcester’s best selling combi boiler range having sold and installed more than 1 million of them in the UK alone. 

Suitable for small to medium-sized homes on a budget the Greenstar i is the brand’s entry-level offering and the range includes the 30i i.e. 30kW and the less powerful Greenstar 25i at 25kW

Although not the brand’s best offering, it still boasts some great features, not least of which is an A-rating for efficiency, a user-friendly digital display and a reassuring ‘Which?’ Best Buy Award.

Review of Boiler Model: Greenstar CDi Compact Boiler 


The CDi Compact is Worcester Bosch’s compact boiler, designed to be the ideal size to fit into small spaces, such as kitchen cupboards. 

Available with multiple power outputs including 28kW, 32kW and 36kW, this combi boiler can still provide heating and hot water for properties with varying demands but offers the dimensions required to save as much space as possible.

Review of Model: Worcester Bosch 2000

The Worcester-Bosch 2000 is the brand’s latest entry-level offering and officially the brands quietest ever boiler.

Its compact design makes it suitable for installation within small spaces such as kitchen cupboards and is available within 25kW or 30kW it has enough power for flats and small homes. 

Boasting A-rating efficiency, a user-friendly digital display and a reassuring Which? Best Buy Award and a contemporary and stylish case, it’s a superb option for small property dwellers on a budget. 

Review of Model: Worcester Bosch 8000 Style 

The Worcester-Bosch 8000 offers the same contemporary design and feel as its cheaper brother, the 2000 but with cutting edge features and superior power outputs, it is ideal for larger homes with more than one bathroom. 

It’s the most powerful and connected wall-hung boiler to date, capable of delivering up to 50kW’s, and with optional smart technology that will top up the boiler for you when low pressure is detected.

Want a quote for a Worcester-Bosch Boiler & Installation?

With us here at Let’s Heat you can get an online quote now to see how much we can install it for: Get Quote Now!

And please remember that whoever you use to install your boiler, please ensure that they are gas safe registered, as we are <<link>> and that they have a great review score for their workmanship see our 4.9 Trustmark rating here!


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Review of Viessmann Combi Boilers (2nd Best Condensing boilers)


Dominating the European boiler market, Viessmann <<link>> is a relatively new entrant to the UK market, but thanks to their prestigious German engineering, reliability and superb customer support they have seen huge growth and popularity within a very short period of time. 

Major benefits of Viessmann boilers include: 

  • Technically brilliant boilers e.g. they use stainless steel heat exchangers
  • 10-year guarantee
  • Excellent customer reviews & aftercare
  • High-efficiency A-rated combi boilers 

Review of Model: Viessmann Vitodens 050-W Gas Combi Boiler