Buy the Best Boiler for You

Which is the best boiler for my home and my budget?

Best boiler reviews tend to focus a single product from a boiler manufacturer’s range of boilers. We think finding the best boiler is more individual than industry ‘best buys’. Your best boiler will depend on which type of boiler you want, property size and your budget. We have researched and summarised the best combi, regular and system boilers available and arranged them into easy to read tables that compare price, efficiency and warranty period. Keep a note of your best boiler selection and get an installation estimate with our Boiler Quote Calculator tool. How else can we help? We review compatible smart thermostats, using an 'Approved Installer' and many other topics in our Information Hub.

Overview of Buying the Best Boiler

There is no such thing as 'The Best Boiler'

There is however the best boiler for you based on property size and budget

Our best boilers are arranged by type and specification

Search by combi, heat only or system boiler. Find your best boiler by price, efficiency, warranty length or hot water performance.

Once you've found your best boiler...

Consider how you want to pay for it with our guide: Ways to Pay for a New Boiler. Or get an estimate of installation cost with our Boiler Quote Calculator.

How to use this Guide

Identify your boiler type

Find your property size

Pick the best boiler for your budget

Identify your boiler type

Combi boilers

​A combination boiler is a single unit that provides heating and hot water to the home. In it provides instantaneous hot water direct from the cold mains. This is different from a traditional system which stores hot water in a tank in advance of use, i.e. a hot water cylinder is not required. Combi boilers are great for freeing up space but do not work well when water pressure is poor.

1-2 BEDROOM FLAT
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Main Eco Elite 25 £606 5 5 26 10.1 90%
Baxi / Duotec 24 £675 7 7 20 9.8 89%
Potterton / Titanium 24 £738 7 7 20 9.8 91%
Worcester Bosch / Greenstar Pro 25i £875 5 7 24 9.8 94%
Vailliant / EcoTEC Pro 24 £942 2 5-10 19 9.6 89%
Worcester Greenstar Compact 28CDi £1045 7 10 24 10.0 94%
2 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Main Eco Elite 30 £668 5 5 30 12.3 88%
Potterton / Titanium 28 £798 7 7 24 11.5 91%
Ideal / Logic+ Combi C30 £830 7 7 24 12.4 90%
Vailliant / EcoFITpure 825 £865 2 7-10 18 12.1 89%
Baxi Platinum 28 £955 10 10 28 11.5 89%
Worcester Greenstar Classic 29CDi £1100 7 10 30 11.0 92%
3 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Ideal / Independent C35 £727 5 5 24 14.5 89%
Potterton / Titanium 33 £858 7 7 28 13.5 91%
Baxi / Duotec 33 £915 7 7 28 13.5 89%
Vailliant / EcoFITpure 830 £980 2 7-10 25 14.2 89%
Vailliant / EcoTEC plus 835 £1100 5 7-10 30 14.3 89%
Baxi Platinum 33 £1100 10 10 33 13.5 89%
4-5 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Ferroli / Modena 38KW £764 5 5 34 16.0 89%
Potterton / Titanium 40 £930 7 7 32 16.4 91%
Vailliant / EcoFITpure 835 £1095 2 7-10 25 16.5 89%
Baxi Platinum 40 £1225 10 10 40 16.4 89%

Heat only (regular) boilers

A regular boiler provides heating directly to the radiators and works with a hot water cylinder to provide hot water. These are usually open-vented heating systems (they can be sealed), i.e. there is a Feed and Expansion tank in the loft. A direct replacement of a regular boiler is very cost effective, however it does limit the new boiler warranty to cover the heating only. The other components of the system, such as pumps, valves and the hot water cylinder are not covered and will be subject to on going maintenance and replacement liability.

1-2 BEDROOM FLAT
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Main Heat Only Boiler 12 £480 2 2 12 x 89%
Baxi 400 Heat 12 £669 5 5 13 x 89%
Vaillant ecoFIT Pure Regular 12 £702 2 7-10 12 x 89%
Worcester Bosch Greenstar Ri 12 £786 7 8 12 x 91%
2 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Main Heat Only Boiler 15 £505 2 2 15 x 89%
Baxi 400 Heat 15 £691 5 5 16 x 89%
Vaillant ecoFIT Pure Regular 15 £733 2 7-10 15 x 89%
Worcester Bosch Greenstar Ri 15 £801 7 8 15 x 91%
3 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Main Heat Only Boiler 18 £539 2 2 18 x 89%
Baxi 400 Heat 18 £720 5 5 19 x 89%
Vaillant ecoFIT Pure Regular 18 £802 2 7-10 18 x 89%
Worcester Bosch Greenstar Ri 18 £859 7 8 18 x 91%
4 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Main Heat Only Boiler 24 £593 2 2 24 x 89%
Baxi 400 Heat 24 £763 5 5 25 x 89%
Vaillant ecoFIT Pure Regular 25 £874 2 7-10 25 x 89%
Worcester Bosch Greenstar Ri 24 £909 7 8 24 x 92%
Worcester Bosch Greenstar Ri 27 £1,021 7 8 27 x 92%
5 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Baxi 400 Heat 30 £834 5 5 30 x 89%
Vaillant ecoFIT Pure Regular 30 £932 2 7-10 30 x 89%
Worcester Bosch Greenstar Ri 30 £1,065 7 8 30 x 93%
Worcester Bosch Greenstar Classic Cdi 30 £1,141 7 10 30 x 92%
LARGER PROPERTIES
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Viessmans Vitodens 100-W Regular 35 £1,325 5 5 35 x 90%
Worcester Bosch Greenstar Classic Cdi 40 £1,589 7 10 41 x 92%

System boilers

Like regular boilers, system boilers work with a hot water cylinder. Unlike regular boilers, the system is not open-vented, i.e. there are no tanks in the loft. In addition, all of the components that would normally be outside a regular boiler (pumps, valves etc) are integrated into the boiler. These are a modern version of the regular boiler and are often installed along side unvented hot water cylinders. They are great for larger properties with more than one bathroom, but only if the water pressure is good.

1-2 BEDROOM FLAT
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Glow Worm Energy System 12 £712 2 2 12 x 89%
Vailliant ecoTEC plus System 12 £772 5 7-10 12 x 89%
Worcester Bosch Greenstar System i 12 £879 7 8 12 x 94%
2 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Glow Worm System Energy 15 £731 2 2 15 x 89%
Ideal Logi+ System 15 £809 7 7 15 x 89%
Vaillant ecoFIT Plus System 15 £858 5 7-10 15 x 89%
Worcester Bosch Greenstar System i 15 £926 7 8 15 x 94%
Ideal Vogue System 15 £944 8 10 15 x 93%
3 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Ferroli Modena HE 25S 18 £575 5 5 17 x 89%
Ideal Logi+ System 18 £841 7 7 18 x 89%
Vaillant ecoFIT Pure System 18 £931 2 7-10 18 x 89%
Worcester Bosch Greenstar System i 18i £974 7 8 18 x 94%
Ideal Vogue System 18 £1,015 8 10 18 x 93%
4 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Ferroli Modena HE 25S 25 £588 5 5 25 x 89%
Ideal Logic+ System 24 £872 7 7 24 x 89%
Worcester Bosch Greenstar System i 24i £1,035 7 8 24 x 94%
Vaillant ecoFIT Pure System 25 £1,100 2 7-10 25 x 89%
Ideal Vogue Systemi 26 £1,169 8 10 26 x 93%
5 BEDROOM HOUSE
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Ferroli Modena 32S 32 £669 5 5 31 x 89%
Ideal Logic+ System 30 £902 7 7 30 x 89%
Worcester Bosch Greenstar System i 30i £1,112 7 8 30 x 92%
Ideal Vogue System 32 £1,256 8 10 32 x 93%
LARGER PROPERTIES
Budget Range Manufacturer / Model Code Price Standard warranty Free Extended Warranty Boiler output kW (Size) Litres per minute for hot water Efficiency
Potterton Promax System 32 £948 2 2 34 x 89%
Baxi Ecoblue System 30 £1,137 7 7 35 x 89%
Worcester Bosch Greenstar System Cdi 35 £1,245 7 10 34 x 92%
Vailliant ecoTEC Plus System 37 £1,312 5 7-10 37 x 89%

What to do next: Top Tips

  1. Find out how much will a boiler installation cost. Get an instant estimate with our free Boiler Quote Calculator - no email address is required to see the results.
  2. Consider the different options to pay for a new boiler - read our guide on Ways to Pay for a New Boiler 
  3. Discover the benefits of using a boiler manufacturer's 'Approved Installer' to fit your boiler.

Other useful guides

Book a survey with a local heating company

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Manufacturer smart controls v Nest and Hive

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Guide to Heating Controls

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What would you like to do next?

Use our calculator to get an estimate of boiler installation cost

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When to swap, change or move your boiler

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Boiler Types Explained – Combi, Regular and System

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