UK’s best boilers, combi boilers, heat your home cheaply. The little gadget in combination boilers heats your home and runs your radiators. These boilers suit most homes, have high efficiency ratings, and frequently offer smart features.
If you’re looking for a new combi boiler but don’t know which brands or how to buy one for your home, you’ve come to the right place. We examined the market, compared combi boiler reviews, and consulted our experts to determine the best for you. This page will compare boiler models’ pricing, longevity, and manufacturer reputation to help you choose.
If you want to install a combi boiler, we can help today for free under the ECO4 scheme. Just answer a simple questions by filling eligibility form to check your eligibility. They may provide personalised pricing for comparison and advice. Free and no commitments, you may find a wonderful price you won’t find anywhere.
What is the best combi boiler?
Our study shows the top boilers in each category:
- Worcester Bosch Greenstar 8000 Style: The most trusted, dependable, and warranty-compliant combi boiler.
- Viessmann Vitodens 100-W: Superior technology and efficiency
- The Baxi Platinum Compact is the greatest combi boiler for price and features.
- Suitable for all homes: Vaillant ecoTec Plus
- Perfect Heating Vogue Max—Best for Guarantee
The following sections list each model’s primary features and costs to help you choose. Each model has something unique. We’ll also discuss other options and how to pick the proper size.
How did we choose the best combi boiler?
We’ve taken the time to find the best combi boiler for various circumstances since we know how frustrating it is to get information fast. Because every home is distinct, heating and hot water demands vary. To find the best combi boilers, we considered many aspects and compared boiler models from top manufacturers. In addition to model rankings, we wanted to know which brand offered customers the most value.
To refine our search, we considered these parameters:
Brand reputation
Knowing a company’s reputation, how customers see them, and if they’ve won any awards is useful. Although reputable manufacturers cost more, you can be guaranteed of a reliable boiler with fewer issues.
Fuel type
Consider fuel-type models’ reliability and performance. This is mostly done to assess each product’s efficiency and environmental impact. You may choose to move from petrol to electric. Knowing your options increases your options.
Size
Choosing the right boiler output has two consequences. Power determines how much heat your boiler can produce. A small home uses less power than a large one. Second, a high output may squander fuel and energy. We feature combi boilers with two output levels: domestic hot water (DHW) and central heating (CH) with a variety of output sizes.
Efficiency
A combi boiler’s efficiency rating shows how much fuel it converts into heat and how much is wasted. It’s the key to saving heating bills and understanding your environmental impact. The ErP scale grades “A” models as extremely efficient if they have an efficiency rate of 90%.
Warranty
Long warranties are beneficial. A longer warranty period reflects the manufacturer’s confidence in your combi boiler’s performance, making it more reliable.
Price
Everyone appears to value our final point. Choosing a heater within your budget is vital. Due to their vast range, combi boilers are now more affordable than ever. This article covers most price ranges, giving you several options.
After considering these features, award-winning manufacturers, market pricing, and installer and customer evaluations, we believe we found the finest combi boilers on the market. Don’t panic if it seems overwhelming! To help you find what you need, we’ve simplified all these categories below.
Best combi boiler manufacturers
To help you choose the best combi boiler, below are the top 5 UK boiler manufacturers:
- Bosch Worcester
- Baxi
- Vaillant
- Ideal
- Viessmann
Years of boiler production have earned these firms excellent ratings. These manufacturers are noted for their durability, future-proof technology, and efficient boilers, as well as their customer service, warranties, and excellence awards.
Worcester Bosch Combi Boiler
- 30 kW and 35 kW CH outputs
- DHW outputs: 30, 35, 40, 45, 55, and 50 kW.
- For compact homes with one bathroom or larger residences with two or more bathrooms and 20 radiators.
- ErP A-certified heat and hot water; 94% efficiency.
- LPG, fuel, and 20% hydrogen mix ready.
- Warranty: 12 years if fitted by Worcester Accredited Installer.
- Expected price: £1,600–£3,000
Baxi Combi Boiler
- 21.2 kW and 26.4 kW CH outputs
- Options for DHW output: 25, 30, 36 kW
- For two-bathroom homes with up to twelve radiators.
- ErP A-certified heat and hot water; 92% efficiency.
- Available fuels: petrol
- Warranty on components and service for 10 years
- Cost (excluding installation): £1,300–£1,700
Vaillant Combi Boiler
- CH outputs: 21.2, 26.5, and 32.2 kW
- DHW outputs: 26, 32, 36, and 40 kW.
- Recommended for: Medium-sized houses with 10–20 radiators
- ErP A-certified heat and hot water; 94% efficiency.
- LPG, petrol and 20% hydrogen ready
- Warranty: Vaillant Advance installations may come with a 10-year warranty.
- Price (excluding installation): £1,500–£1,880
Ideal Combi Boiler
- Available CH outputs: 18, 26, and 32 kW
- DHW outputs: 26, 32, and 40 kW
- For houses with one bathroom and ten radiators, up to two bathrooms and fifteen radiators.
- ErP A-certified heat and hot water; 93% efficiency.
- LPG and petrol.
- 10-year guarantee; 12-year if maintained and installed by a Max-accredited installation.
- Cost (excluding installation): £1,500–£1,800
Viessmann Combi Boiler
- CH output: 19kW, 25kW, 32kW
- Options for DHW output: 27.3, 31.7, and 34.9 kW
- Ideal for: Medium-sized homes with two bathrooms and 10–20 radiators.
- Maximum efficiency: 98% with ErP A heat and hot water.
- Available fuels: LPG, petrol, 20% ready hydrogen
- The standard warranty is 10 years, but the Viessmann Installer Portal extends it to 12 years.
- Cost (excluding installation): £1,200–1,600
Get a Brand-new Combi Boiler with Free Boiler Scheme
Qualifying for the free boiler scheme and getting a brand new combi boiler is easier than you think. If your home has a low EPC rating or you receive certain government benefits, you could be eligible for a free boiler replacement. Check your eligibility now and enjoy the benefits of a new, energy-efficient boiler.
In a Nutshell
There are different features that different combi boiler brands in the UK offer in different versions. Some are more reliable than others, while some are less costly and easy to install. Five best combi boiler manufacturers are Bosch Worcester, Baxi, Vaillant, Ideal and Viessmann. Though other companies also offer excellent combination boilers, these big fives are mostly reviewed better by customers and far less complaints.
