Gas Boilers | Guide to Boiler Types, Sizing, Brands & Prices

QUICK GUIDE SUMMARY

Which gas boiler do I need?

We help you find the right gas boiler for your home. Use our guide to find which type of gas boiler you need (combi, heat only or system) and use our tables to work out your size of boiler. We then show you boilers by brand and price to help you find the best boiler for your budget. How else can we help? Research more heating topics at our Boiler Information Hub. Ready to go? Get an estimate for installation with our Boiler Quote Calculator, book a survey with a Local Installer or consider the different ways you can Pay for a New Boiler.

Overview to finding the right type, size and model gas boiler

Gas boilers are available as a combi, heat only or system model.

Which boiler type you choose will depend on your existing heating system and requirements for the new boiler.

Use our sizing table to find your rough boiler size.

Boiler size is based property size, property age, number of bathrooms and any plans to extend your home. 

Which is the best gas boiler for you?

Find the table for your boiler type and property size/age. E.g Combi, 2 bed house, 1950s. Find your best boiler in the table according to budget, warranty length and performance.

HOW TO USE THIS GUIDE

Using this Guide: use this guide to find the right type and size gas boiler for your home.

Gas boilers by type

Size your gas boiler

Brands and prices

GAS BOILERS BY TYPE

Which type of gas boiler do I have? Combi, Heat Only & System?

Combi boiler:

also known as a combination boiler, combines heating and hot water production in a single, usually wall hung, unit. Hot water is produced instantly when you turn the hot tap as appose to it being stored in a tank.

Heat Only boiler:

also known as a regular boiler, provides heating direct from the boiler and works with a hot water tank to provide hot water. Heat only boilers can work on open vented systems and sealed systems.

System boiler:

is like a Heat Only boiler as it works with a hot water tank, however unlike a heat only boiler many of the system components (such as the pump and diverter valve) are integral to the unit. These are mostly found in larger new build homes with multiple bathrooms.

Should I stick with the same boiler type or switch to a new type?

Like for like swap in the same location:

keeps costs down as alternations are minimal. If you have an old combi then there will be additional pipework and new flue requirements for a new combi, which can cause complications.

Move from Heat Only to a Combi:

a common upgrade. More expensive as the hot water pipes need to be re- routed, but frees up space where the hot water used to be and provides a more comprehensive warranty from the boiler manufacturer

Move to a system boiler:

system boilers come into their own where there are multiple bathrooms. If you are extending and adding bathrooms, and water pressure is good, a system boiler is a better option as it deliver better hot water flow rates to multiple hot water outlets at the same time.

What size gas boiler do I need?

How do you know what size gas boiler you need? We have provided a guide, and it is a guide, to sizing your boiler. If you have a system or regular boiler the size will be based on the heat requirements of your property. For combi boilers, the size is ‘bigger’ because it includes hot water production. The temptation is to oversize the boiler, just in case. Oversized boilers are in fact less efficient. A boiler should be sized accurately based on your house construction, i.e. insulation levels and hot water requirements. Just to be clear, this is a rough guide. An experienced heating engineer will properly size your boiler after a site visit.

Sizing a combi boiler

The table below gives you a rough indication based on 1) the size of your property and the number of bathrooms and 2) how well insulated it is. Property ages are given across the top and they assume standard insulation measures, such as double glazing and loft insulation, have been made. If your levels of insulation are very high in an older property then you may wish to move a column to the right. If you are planning on adding bathrooms you will need to factor in hot water flow rates (see below).

Sizing for Hot Water - Our Top Tips

The hot water flow rate of a combi boiler, expressed as ‘litres per minute’, indicates how quickly a combi boiler can heat hot water. This is important for houses with multiple bathrooms because the hot water flow rate will be halved if two showers are running simultaneously. If the sizing table indicates that you require a 24kW boiler, you will see under the ’24-25kW group’ of boilers that hot water flow rates range from 9.8 litres per minute to a whopping 16.5 litres per minute. If you have multiple bathrooms you may wish to consider a boiler with a higher flow rate. NB for three or more bathrooms you may wish to consider a system boiler and high performance hot water tank.

Combi Boilers
Age of property pre 1900 1920s-1930s 1950-1980s 1990s 2000 onwards
Insulation levels Poorly insulated Some insulation Moderately insulated Reasonably insulated Well insulated
No of bedrooms and bathrooms          
1 bed + 1 bath 20kW 20kW 20kW 18kW 18kW
2 bed + 1 bath 24kW 24kW 20kW 20kW 20kW
2 bed + 2 bath 24kW 24kW 20kW 20kW 20kW
3 bed + 1 bath 28kW 28kW 26kW 24kW 24kW
3 bed + 2 bath 28kW 28kW 28kW 24kW 24kW
3 bed + 3 bath 30kW 30kW 30kW 30kW 30kW
4 bed + 1 bath 30kW 30kW 30kW 28kW 28kW
4 bed + 2 bath 32kW 32kW 32kW 30kW 30kW
4 bed + 3 bath 32kW 32kW 32kW 30kW 30kW
5 bed + 2 bath 40kW 40kW 35kW 32kW 30kW
5 bed + 3 bath 40kW 40kW 35kW 32kW 30kW
5+ bed + 3 bath 40kW 40kW 35kW 32kW 32kW

Now find your combi gas boiler according to brand and budget:

Now you know roughly what size boiler you need, use the tables below to find a suitable model. The tables are ordered in boiler size and closely sized boilers are grouped together in a size bracket, say 18-19kW. If the size table above recommends at 18kW boiler for example, then all the boilers in the size group of 18-19kW are suitable.

18-19kW boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Glow Worm/Energy 25kW £700 2 2 18kW 10.4 89%
Ideal/Vogue C26 £1,056 10 10 18kW 10.6 91%
Vaillant/EcoFITpure 825 £865 2 7-10 18kW 12.1 89%
Vaillant/EcoTEC pro 24 £942 2 5-10 19kW 9.6 89%
Vaillant ecoTEC plus 825 £1,107 5 7-10 19kW >10.5 89%
Vaillant/EcoTEC pro 28 £984 2 5-10 19kW 11.1 89%
20-22kW boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi/Duotec 24 £675 7 7 20kW 9.8 89%
Potterton/Titanium 24 £738 7 7 20kW 9.8 91%
Baxi/Eco Blue + Compact 24 £810 7 7 20kW 9.8 89%
Potterton/Promax 24 Plus £833 2 2 20kW 9.8 89%
Baxi Ecoblue Advance 24 £920 10 10 20kW 9.8 89%
Baxi 200 224 £629 3 3 20kW 9.8 89%
Baxi 400 424 £663 3 3 20kW 9.8 89%
Glow Worm/Easicom 24 £570 2 4 20kW 10 90%
Glow Worm/Essential 24 £618 3 3 20kW 10 89%
Potterton/Gold 24 £628 2 2 20kW 9.8 91%
Baxi 200 228 £651 5 5 20kW 11.5 89%
Baxi 400 428 £699 5 5 20kW 11.5 89%
Viessmann/Vitodens 050 29kW £827 3 7 >22kW 12.4 89%
24kW boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Bosch/Greenstar i 25i £875 5 7 24kW 9.8 94%
Worcestster Bosch/Si 25Si £1,010 7 9 24kW 9.8 94%
Ideal/ Logic+ Combi C24 £794 7 7 24kW 9.9 90%
Viessmann/Vitodens 100 26kW £1,050 5 10 24kW 8.9 89%
Worcester Greenstar Compact 28CDi £1,045 7 10 24kW 10.0 94%
Baxi Platinum 24 £850 10 10 24kW 9.8 89%
Ideal Independent C24 £607 5 5 24kW >9.9 89%
Ideal Independent C30 £651 5 5 24kW 12.4 89%
Glow Worm/Easicom 28 £605 2 4 24kW 11.7 90%
Ferroli/Modena 27kW £577 5 5 24kW 11.1 89%
Ideal Independent C35 £727 5 5 24kW 14.5 89%
Potterton/Gold 28 £696 2 2 24kW 13.3 91%
Baxi/Duotec 28 £795 7 7 24kW 11.5 89%
Potterton/Titanium 28 £798 7 7 24kW 11.5 91%
Worcester Bosch/Greenstar i 30i £990 5 7 24kW 11.5 94%
Worcestster Bosch/Si 30Si £1,135 7 9 24kW 11.5 94%
Baxi/Eco Blue + Compact 28 £885 7 7 24kW 11.5 89%
Vaillant/EcoTEC pro 30 £1,080 2 5-10 24kW 12.3 89%
Ideal/ Logic+ Combi C30 £830 7 7 24kW 12.4 90%
Ideal/ Logic+ Combi C35 £985 7 7 24kW 14.5 90%
Worcester Greenstar Compact 32CDi £1,140 7 10 24kW 11.5 94%
Worcester Greenstar Compact 36CDi £1,285 7 10 24kW 12.9 94%
Baxi Ecoblue Advance 28 £1,060 10 10 24kW 11.5 89%
Vaillant ecoTEC plus 832 £1,226 5 7-10 24kW 13.0 89%
Glow Worm/Easicom 28 £658 3 3 25kW 11.7 89%
Glow Worm/Ultimate 2 30 £694 5 5 25kW 12.5 89%
Glow Worm/Energy 30kW £787 2 2 25kW 12.5 89%
Glow Worm/Energy 35kW £880 2 2 25kW 14.4 89%
Glow Worm/Ultimate 2 35 £766 5 5 25kW 14.4 89%
Potterton/Promax 28 Plus £877 2 2 25kW 11.5 89%
Vaillant/EcoFITpure 830 £980 2 7-10 25kW 14.2 89%
Vaillant/EcoFITpure 835 £1,095 2 7-10 25kW 16.5 89%
Vaillant ecoTEC Green iQ 835 £1,651 5 7-10 25kW 14.5 94%
Ideal/Vogue C32 £1,245 10 10 26kW 13.1 91%
Main Eco Elite 25 £606 5 5 26kW 10.1 90%
Viessmann Vitodens 200 26kW £1,358 3 5 26kW 10.7 90%
28-29kW boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Viessmann/Vitodens 100 30kW £1,100 5 10 27kW 11.2 89%
Ferroli/Modena 32kW £632 5 5 28kW 13.1 89%
Potterton/Gold 33 £764 2 2 28kW 15.7 91%
Baxi/Duotec 33 £915 7 7 28kW 13.5 89%
Potterton/Titanium 33 £858 7 7 28kW 13.5 91%
Baxi/Eco Blue + Compact 33 £955 7 7 28kW 13.5 89%
Baxi Platinum 28 £955 10 10 28kW 11.5 89%
Baxi Ecoblue Advance 33 £1,175 10 10 28kW 13.5 89%
Potterton/Promax 33 Plus £1,045 2 2 29kW 13.5 89%
Vaillant ecoTEC plus 838 £1,394 5 7-10 29kW 15.9 89%
30kw boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Greenstar Classic 29CDi £1,100 7 10 30kW 11.0 92%
Worcester Greenstar Classic 34CDi £1,225 7 10 30kW 12.0 92%
Viessmann Vitodens 200 30kW £1,435 3 5 30kW 12.3 90%
Main Eco Elite 30 £668 5 5 30kW 12.3 88%
Viessmann/Vitodens 050 35kW £906 3 7 30kW 14.5 89%
Worcester Greenstar Classic 38CDi £1,395 7 10 30kW 4 92%
Vaillant ecoTEC plus 835 £1,110 5 7-10 30kW 14.3 89%
Worcester Greenstar Classic 42CDi £1,665 7 10 30kW 15.0 92%
32kW boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi/Duotec 40 £985 7 7 32kW 16.4 89%
Potterton/Titanium 40 £930 7 7 32kW 16.4 91%
Viessmann/Vitodens 100 35kW £1,160 5 10 32kW 13.5 89%
Baxi Ecoblue Advance 40 £1,240 10 10 32kW 16.4 89%
Ideal/Vogue C40 £1,390 10 10 32kW 16.4 91%
Baxi Platinum 33 £1,110 10 10 33kW 13.5 89%
Vaillant ecoTEC Green iQ 843 £1,979 5 7-10 33kW 17.8 94%
Ferroli/Modena 38kW £764 5 5 34kW 16 89%
35-40kW boilers
Manufacturer/Model Code Price Standard warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Viessmann Vitodens 200 35kW £1,620 3 5 35kW 14.3 90%
Baxi Platinum 40 £1,225 10 10 40kW 16.4 89%

Sizing a heat only boiler

It is more straightforward to size a heat only boiler than a combi as you are only sizing the heat production, not the hot water. In the table below you can get a rough idea of what size boiler you need based 1) the size of your property and 2) how well insulated it is. Property ages are given across the top and they assume standard insulation measures, such as double glazing and loft insulation, have been made. If your levels of insulation are very high in an older property then you may wish to move a column to the right.

Heat Only Boilers
Age of property pre 1900 1920s-1930s 1950-1980s 1990s 2000 onwards
Insulation levels Poorly insulated Some insulation Moderately insulated Reasonably insulated Well insulated
Number of bedrooms          
1 15kW 13kW 12kW 12kW 12kW
2 18kW 16kW 15kW 15kW 13kW
3 21kW 20kW 18kW 16kW 15kW
4 24kW 22kW 20kW 18kW 16kW
5 35kW 30kW 24kW 20kW 18kW
5+ 41kW 35kW 30kW 25kW 21kW

Now find your heat only gas boiler according to brand and budget:

Now you know roughly what size boiler you need, use the tables below to find a suitable model. The tables are ordered in boiler size and closely sized boilers are grouped together in a size bracket, say 18-21kW. If the size table above recommends at 18kW boiler for example, then all the boilers in the size group of 18-21kW are suitable.

12-13kW boilers
12-13kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Main heat only boiler 12 £480.00 2 2 12kW 89%
Potterton Promax SL Heat 12 £674.00 2 2 12kW 89%
Ideal Logic Heat 12 £695.00 2 2 12kW 89%
Vaillant ecoFIT pure regular 12 £702.00 2 7-10 12kW 89%
Glow Worm Energy Regular 12 £704.00 2 2 12kW 89%
Vaillant ecoTEC plus regular 12 £730.00 5 7-10 12kW 89%
Ideal Logic + Heat 12 £765.00 7 7 12kW 89%
Worcester Bosch Greenstar Ri 12 £786.00 7 8 12kW 91%
Baxi 200 Heat 12 £653.00 3 3 13kW 89%
Baxi 400 Heat 12 £669.00 5 5 13kW 89%
Baxi Ecoblue Advance Heat 13 £776.00 7 7 13kW 89%
Baxi Ecoblue Heat 12 £795.00 2 2 13kW 89%
Viessmans Vitodens 100-W Regular 13 £816.00 5 5 13kW 90%
15-16kW boilers
15-16kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Main heat only boiler 15 £505.00 2 2 15kW 89%
Glow Worm Energy Regular 15 £722.00 2 2 15kW 89%
Ideal Logic Heat 15 £730.00 2 2 15kW 89%
Vaillant ecoFIT pure regular 15 £733.00 2 7-10 15kW 89%
Potterton Promax SL Heat 15 £751.00 2 2 15kW 89%
Ideal Logic + Heat 15 £796.00 7 7 15kW 89%
Worcester Bosch Greenstar Ri 15 £801.00 7 8 15kW 91%
Vaillant ecoTEC plus regular 15 £822.00 5 7-10 15kW 89%
Baxi 200 Heat 15 £677.00 3 3 16kW 89%
Baxi 400 Heat 15 £691.00 5 5 16kW 89%
Viessmans Vitodens 100-W Regular 16 £841.00 5 5 16kW 90%
Baxi Ecoblue Heat 15 £843.00 2 2 16kW 89%
Baxi Ecoblue Advance Heat 16 £855.00 7 7 16kW 89%
18-21kW boilers
18-21kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Main heat only boiler 18 £539.00 2 2 18kW 89%
Glow Worm Energy Regular 18 £755.00 2 2 18kW 89%
Ideal Logic Heat 18 £763.00 2 2 18kW 89%
Potterton Promax SL Heat 18 £780.00 2 2 18kW 89%
Vaillant ecoFIT pure regular 18 £802.00 2 7-10 18kW 89%
Worcester Bosch Greenstar Ri 18 £859.00 7 8 18kW 91%
Vaillant ecoTEC plus regular 18 £894.00 5 7-10 18kW 89%
Baxi 200 Heat 18 £708.00 3 3 19kW 89%
Baxi 400 Heat 18 £720.00 5 5 19kW 89%
Baxi Ecoblue Heat 18 £860.00 2 2 19kW 89%
Baxi Ecoblue Advance Heat 19 £908.00 7 7 19kW 89%
Viessmans Vitodens 100-W Regular 19 £858.00 5 5 19kW 90%
Baxi 200 Heat 24 £749.00 3 3 21kW 89%
Baxi Ecoblue Heat 21 £913.00 2 2 21kW 89%
22-24kW boilers
22-24kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Promax SL Heat 24 £822.00 2 2 22kW 89%
Main heat only boiler 24 £593.00 2 2 24kW 89%
Ideal Logic Heat 24 £796.00 2 2 24kW 89%
Ideal Logic + Heat 24 £828.00 7 7 24kW 89%
Worcester Bosch Greenstar Ri 24 £909.00 7 8 24kW 92%
Vaillant ecoTEC plus regular 24 £959.00 5 7-10 24kW 89%
25-27kW boilers
25-27kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Baxi 200 Heat 30 £756.00 3 3 25kW 89%
Baxi 400 Heat 24 £763.00 5 5 25kW 89%
Glow Worm Energy Regular 24 £788.00 2 2 25kW 89%
Vaillant ecoFIT pure regular 25 £874.00 2 7-10 25kW 89%
Baxi Ecoblue Heat 24 £1,103.00 2 2 25kW 89%
Baxi Ecoblue Advance Heat 25 £925.00 7 7 25kW 89%
Viessmans Vitodens 100-W Regular 26 £915.00 5 5 26kW 90%
Worcester Bosch Greenstar Ri 27 £1,021.00 7 8 27kW 92%
30kW boilers
30kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Glow Worm Energy Regular 30 £826.00 2 2 30kW 89%
Baxi 400 Heat 30 £834.00 5 5 30kW 89%
Ideal Logic Heat 30 £905.00 2 2 30kW 89%
Vaillant ecoFIT pure regular 30 £932.00 2 7-10 30kW 89%
Baxi Ecoblue Advance Heat 30 £981.00 7 7 30kW 89%
Ideal Logic + Heat 30 £889.00 7 7 30kW 89%
Vaillant ecoTEC plus regular 30 £1,000.00 5 7-10 30kW 89%
Worcester Bosch Greenstar Ri 30 £1,065.00 7 8 30kW 93%
Worcester Bosch Greenstar Classic Cdi 30 £1,141.00 7 10 30kW 92%
35kW - 41kW boilers
35kW- 41kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Viessmans Vitodens 100-W Regular 35 £1,325.00 5 5 35kW 90%
Vaillant ecoFIT pure regular 35 £1,449.00 2 7-10 35kW 89%
Vaillant ecoTEC plus regular 35 £1,535.00 5 7-10 35kW 89%
Worcester Bosch Greenstar Classic Cdi 40 £1,589.00 7 10 41kW 92%

Sizing a system boiler

Like a heat only boiler, a system boiler can be sized for heating only. Use the table below to find the right size based on 1) property size and 2) property age factoring in insulation levels. If you house has seen standard levels of improvements, such as loft insulation or double glazing, then go with its age bracket. If it has been heavily improved then consider moving one column to the right.

System Boilers
Age of property pre 1900 1920s-1930s 1950-1980s 1990s 2000 onwards
Insulation levels Poorly insulated Some insulation Moderately insulated Reasonably insulated Well insulated
Number of bedrooms          
1 15kW 15kW 12kW 12kW 12kW
2 18kW 18kW 15kW 15kW 12kW
3 20kW 20kW 18kW 18kW 15kW
4 24kW 24kW 20kW 18kW 18kW
5 35kW 30kW 24kW 20kW 18kW
5+ 37kW 35kW 30kW 25kW 20kW

Now find your system gas boiler according to brand and budget:

Now you know roughly what size boiler you need, use the tables below to find a suitable model. The tables are ordered in boiler size and closely sized boilers are grouped together in a size bracket, say 24-26kW. If the size table above recommends at 24kW boiler for example, then all the boilers in the size group of 24-26kW are suitable.

12-13kW boilers
12-13kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Glow Worm Energy System 12 712 2 2 12kW 89%
Vaillant ecoTEC plus system 12 772 5 7-10 12kW 89%
Potterton Promax System 12 794 2 2 12kW 89%
Vaillant ecoFIT pure system 12 812 2 7-10 12kW 89%
Worcester Bosch Greenstar System i 12 879 7 8 12kW 94%
Baxi Ecoblue System 12 901 7 7 13kW 89%
15-17kW boilers
15-17kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Glow Worm Energy System 15 £731.00 2 2 15kW 89%
Ideal Logic System 15 £741.00 2 2 15kW 89%
Potterton Promax System 15 £808.00 2 2 15kW 89%
Ideal Logic + System 15 £809.00 7 7 15kW 89%
Vaillant ecoTEC plus system 15 £858.00 5 7-10 15kW 89%
Vaillant ecoFIT pure system 15 £875.00 2 7-10 15kW 89%
Worcester Bosch Greenstar System i 15 £926.00 7 8 15kW 94%
Ideal Vogue System 15 £944.00 8 10 15kW 93%
Baxi Ecoblue System 15 £923.00 7 7 17kW 89%
Ferroli Modena HE 18S 18 £575.00 5 5 17kW 89%
18-21kW boilers
18-21kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Gold System 18 £566.00 2 2 18kW 88%
Glow Worm Energy System 18 £757.00 2 2 18kW 89%
Ideal Logic System 18 £810.00 2 2 18kW 89%
Potterton Promax System 18 £825.00 2 2 18kW 89%
Ideal Logic + System 18 £841.00 7 7 18kW 89%
Vaillant ecoFIT pure system 18 £931.00 2 7-10 18kW 89%
Vaillant ecoTEC plus system 18 £954.00 5 7-10 18kW 89%
Worcester Bosch Greenstar System i 18i £974.00 7 8 18kW 94%
Ideal Vogue System 18 £1,015.00 8 10 18kW 93%
Viessmann 100-W System 19 £1,032.00 5 5 19kW 90%
Viessmann 200-W System 19 £1,296.00 5 5 19kW 90%
Baxi Ecoblue System 18 £962.00 7 7 20kW 89%
Worcester Bosch Greenstar System i 21 £1,014.00 7 8 21kW 94%
24-24kW boilers
24-25kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Gold System 21 £589.00 2 2 24kW 88%
Ideal Logic System 24 £844.00 2 2 24kW 89%
Ideal Logic + System 24 £872.00 7 7 24kW 89%
Worcester Bosch Greenstar System i 24i £1,035.00 7 8 24kW 94%
Vaillant ecoTEC plus system 24 £1,137.00 5 7-10 24kW 89%
Ferroli Modena HE 25S 25 £588.00 5 5 25kW 89%
Glow Worm Energy System 25 £809.00 2 2 25kW 89%
Potterton Promax System 24 £863.00 2 2 25kW 89%
Vaillant ecoFIT pure system 25 £1,100.00 2 7-10 25kW 89%
Main System Eco Elite 24 £617.00 3 3 26kW 92%
Viessmann 100-W System 26 £1,068.00 5 5 26kW 90%
Ideal Vogue System 26 £1,169.00 8 10 26kW 93%
Viessmann 200-W System 26 £1,410.00 5 5 26kW 90%
26-29kW boilers
26-29kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Worcester Bosch Greenstar System i 27i £1,042.00 7 8 27kW 92%
Baxi Ecoblue System 24 £1,053.00 7 7 27kW 89%
Vaillant ecoTEC exclusive 27 £1,438.00 5 7-10 27kW 90%
Potterton Gold System 24 £609.00 2 2 28kW 88%
Main System Eco Elite 28 £680.00 3 3 29kW 92%
30-32kE boilers
30-32kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Glow Worm Energy System 30 £833.00 2 2 30kW 89%
Ideal Logic System 30 £877.00 2 2 30kW 89%
Ideal Logic + System 30 £902.00 7 7 30kW 89%
Viessmann 100-W System 30 £1,100.00 5 5 30kW 90%
Worcester Bosch Greenstar System i 30i £1,112.00 7 8 30kW 92%
Worcester Bosch Greenstar System Cdi 30 £1,132.00 7 10 30kW 92%
Vaillant ecoTEC plus system 30 £1,173.00 5 7-10 30kW 89%
Vaillant ecoFIT pure system 30 £1,207.00 2 7-10 30kW 89%
Viessmann 200-W System 30 £1,519.00 5 5 30kW 90%
Ferroli Modena HE 32S 32 £669.00 5 5 31kW 89%
Baxi Ecoblue System 28 £1,087.00 7 7 31kW 89%
Ideal Vogue System 32 £1,256.00 8 10 32kW 93%
34-37kW boilers
34-37kW Code Price Standard warranty Free extended warranty Central heating output Efficiency
Potterton Promax System 32 £948.00 2 2 34kW 89%
Worcester Bosch Greenstar System CDI 35 £1,245.00 7 10 34kW 92%
Baxi Ecoblue System 30 £1,137.00 7 7 35kW 89%
Viessmann 100-W System 35 £1,511.00 5 5 35kW 90%
Viessmann 200-W System 35 £1,571.00 5 5 35kW 90%
Vaillant ecoTEC plus system 37 £1,312.00 5 7-10 37kW 89%

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