Combi Boiler Prices | We Compare 83 Boiler Models!

Quick Guide Summary

Who offers the best combi boiler prices in 2018?

We compare combi boiler prices on 83 models of boilers from 9 manufacturers: Worcester, Vaillant, Baxi, Viessmann, Potterton, Main, Glow-Worm, Ferroli and Ideal in the ULTIMATE guide to combi boilers. Combi boiler prices range from around £600 for a small, entry-level boiler to nearly £2,000 for a large, premium range model. Use our comprehensive guide to find your best value combi boiler based on property size and budget. How else can we help? Research many more heating topics at our Information Hub. Need more help on combi boilers? Try our Combi Boiler Guide where we explain the pros, the cons and when they are suitable.

Overview of Combi Boiler Prices

What is a combi boiler?

A combi boiler (or combination boiler) is a compact, single unit that generates all the heating and instantaneous hot water for the home. It works without a hot water cylinder.

How much does a combi cost?

Between £600 - £2000. We group combi boilers below according to budget and quality. For a fully fitted estimate of cost, try our Boiler Quote Calculator.

Found your boiler? What's next?

Looking for flexible ways to pay? Read our comprehensive guide: Ways to Pay for Your New Boiler. Need to find a local installer? Search our network of great local heating companies.

How to use this Guide

Guide to using the boiler tables

Find your property size

Find your best boiler according to budget

Guide to using the boiler tables

The aim of this guide is to help you find the most suitable combi boiler for your property's size and your budget. This guide considers groups of combi boiler according to budget, we have four: Entry level (cheapest), Economy (one up from entry level), Mid-Range and Premium, the most expensive. The best value combi boiler for your circumstances may not necessarily be the most expensive. In each group we compare - prices, sizes, efficiency, warranty length and hot water performance - from the full range of A-rated condensing boilers from nine manufacturers: Worcester Bosch, Baxi, Viessmann, Potterton, Main, Ideal, Glow-worm, Vaillant and Ferroli, to help you decide.

The tables are arranged so that you can easily find your property size and then find who offers the best boiler package for your budget. The tables show boiler price alongside warranty period and performance so you can find the best value boiler. Where there is a clear 'best buy' we have highlighted that boiler.

In the example table below, it is easy to see that the Glow Worm Ultimate is great value at £694 with a five year warranty and hot water flow rate of 12.5 litres per minute. It is £100 less than the Glow Worm Energy with a 2 year warrant and the Baxi Duotec which has a 7 year warranty but lower hot water flow rate.

Manufacturer/Model

Code

Price

Standard Warranty

Free Extended Warranty

Heating output (Size)

Litres per minute for hot water

Efficiency

Baxi/Duotec

28

£795

7

7

24KW

11.5

89%

Glow Worm/Energy

30KW

£787

2

2

25KW

12.5

89%

Glow Worm/Ultimate 2

30

£694

5

5

25KW

12.5

89%

In all cases we have considered only wall hung combination boilers. Floor standing and boilers
combined with a hot water tank are not included here.

Best Buys and Best Performance

We have weighed up the boiler warranty, price, output and efficiency to see if there are any clear 'best buys' in each group. In both the Entry Level and Economy groups there are clear winners that offer a great all round package at a great price. In the Mid Range and Premium groups there are clear best buys but there are also some Best Performance category boilers. These offer amazing technological features and long warranties, but are not necessarily the cheapest.

Entry Level Combi Boilers

The majority of our entry level combi boilers range between £600 - £700, with only some of the larger models coming in over £700. Many offer free extended warranties of 5 years when you use an approved installer.

Small
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi 200 224 £629 3 3 20KW 9.8 89%
Baxi 400 424 £663 5 5 20KW 9.8 89%
Ideal Independent C24 £607 5 5 24KW 9.9 89%
Main Eco Elite 25 £606 5 5 24KW 10.1 90%
Glow Worm/Easicom 24 £570 2 4 26KW 10 90%
Glow Worm/Essential 24 £618 3 3 20KW 10 89%
Potterton/Gold 24 £628 2 2 20KW 9.8 91%
Medium
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi 200 228 £651 3 3 20KW 11.5 89%
Baxi 400 428 £699 5 5 20KW 11.5 89%
Ideal Independent C30 £651 5 5 24KW 12.4 89%
Main Eco Elite 30 £668 5 5 30KW 12.3 88%
Glow Worm/Easicom 28 £605 2 4 24KW 11.7 90%
Glow Worm/Essential 28 £658 3 3 25KW 11.7 89%
Ferroli/Modena 27KW £577 5 5 24KW 1.1.1 89%
Large
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Ideal Independent C35 £727 5 5 24KW 14.5 89%
Potterton/Gold 28 £696 2 2 24KW 13.3 91%
Ferroli/Modena 32KW £632 5 5 28KW 13.1 89%
Extra Large
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Potterton/Gold 33 £764 2 2 28KW 15.7 91%
Ferroli/Modena 38KW £764 5 5 34KW 16 89%

Results Overview

We have found that not all manufacturers produce a boiler model for each of our budget groups. Where a manufacturer is not listed in the group they quite simply do not have a boiler in that price range. For example, Vaillant do not produce an Entry Level or Economy boiler model whilst Ferroli only produce an Entry Level boiler model.

The tables below also include some key data on heating out puts and domestic hot water flow rates. It is important to remember that for many combination boilers the heat output is the same for all of the model sizes, it is only the hot water flow rate that increases on the ‘larger’ models. So for example, the Ideal Independent comes in C24, C30 and C35 models. The heating output is 24kW for all of them, only the hot water flow rates vary: 9.9 LPM, 12.4 LMP and 14.5 LPM respectively. In other words, the model ‘number’ is not always an indication of heat output, although it occasionally is (confusing we know).

Economy Combi Boilers

The majority of our Economy combi boilers range between £700 and £800 for the smaller models and £800 and £900 for the larger models, with only the very large 32kW boilers going a bit higher.  Warranty cover varies wildly in this range. The Baxi and Potterton ranges offer a great 7 year warranty and the Glow Worm Energy, a similar priced boiler, offering only 2 years.

Small
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%
Glow Worm/Energy 25KW £700 2 2 18KW 10.4 89%
Potterton/Titanium 24 £738 7 7 20KW 9.8 91%
Medium
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi/Duotec 28 £795 7 7 24KW 11.5 89%
Glow Worm/Energy 30KW £787 2 2 25KW 12.5 89%
Glow Worm/Ultimate 2 30 £694 5 5 25KW 12.5 89%
Potterton/Titanium 28 £798 7 7 24KW 11.5 91%
Large
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi/Duotec 33 £915 7 7 28KW 13.5 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/Titanium 33 £858 7 7 28KW 13.5 91%
Extra Large
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 31KW 16.4 89%
Potterton/Titanium 40 £930 7 7 32KW 16.4 91%

Mid Range Combi Boilers

We have found Mid Range boilers a much harder group to define. Prices for the small and medium models vary between £800 and £1100 and for the larger models between £900 and £1150. Almost all come with at least a 7 year warranty. It seems that the manufacturers that offer 10 year warranties do charge more for their boilers in these groups. Across the board boiler warranties are much better. Most come with a standard warranty of at least 5 years with free extensions of up to 10 years.

Small
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Bosch/Greenstar 25i £875 5 7 24KW 9.8 94%
Worcester Bosch/Si 25S1 £1,010 7 9 24KW 9.8 94%
Baxi/Eco Blue + Compact 24 £810 7 7 20KW 9.8 89%
Valliant/EcoTEC pro 24 £865 2 5-10 19KW 9.6 89%
Ideal/Logic + Combi C24 £794 7 7 24KW 9.9 90
Potterton/Promax 24 Plus £833 2 2 20KW 9.8 89%
Viessmann/Vitodens 100 26KW £1,050 5 10 24KW 8.9 89%
Medium
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Bosch/Greenstar Professional 30i £990 5 7 24KW 11.5 94%
Worcester Bosch/Si 30Si £1115 7 9 >24KW 11.5 94%
Baxi/EcoT Blue + Compact 28 £885 7 7 24KW 11.5 >89%
Vaillant EcoFIT Pure 830 £896 2 7-10 18KW 12.4 89%
Vaillant EcoTEC Pro 28 £934 2 5-10 19KW 11.1 89%
Vaillant EcoTEC Pro 30 £1021 2 5-10 24KW 12.3 89%
Ideal/Logic + Combi C30 £830 7 7 24KW 12.4 90%
Potterton/Promax 28 Plus £877 2 2 25KW 11.5 89%
Viessmann/Vitodens 050 29KW £827 3 7 22KW 12.4 89%
Viessmann/Vitodens 100 30KW £1100 5 10 27KW 11.2 89%
Large
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Baxi/EcoT Blue + Compact 33 £955 7 7 28KW 13.5 89%
Valliant/EcoFITpure 835 £1098 2 7-10 25KW 14.4 89%
Ideal/Logic + Combi C35 £985 7 7 24KW 14.5 90%
Potterton/Promax 33 Plus £1,045 2 2 29KW 13.5 89%
Viessmann/Vitodens 050 35kW £906 3 7 30KW 14.5 89%
Viessmann/Vitodens 100 35kW £1,160 5 10 32KW 13.5 89%

Premium Combi Boilers

The Premium boiler group sees some much bigger variations in price. For the smaller models, prices range from £850 to around £1100, with only the Viessmann going significantly higher due to, we understand, technological superiorities. At the larger end, prices range between £1,200 and nearly £2,000. Model in this range of boilers are high performance and often aimed at larger properties. Nearly all come with a standard warranty of over 7 years.

Small
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Greenstar Compact 28CDi £1,045 7 10 24KW 10.0 94%
Baxi Ecoblue Advance 24 £920 10 10 20KW 9.8 89%
Baxi Platinum 24 £850 10 10 24KW 9.8 89%
Vaillant ecoTEC plus 825 £1,107 5 7-10 19KW 10.5 89%
Viessmann Vitodens 200 26KW £1,358 3 5 26KW 10.7 90%
Ideal/Vogue C26 £1,056 8 10 18KW 10.6 91%
Medium
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Greenstar Compact 32CDi £1,140 7 10 24KW 11.5 94%
Worcester Greenstar Classic 29CDi £1,100 7 10 30KW 11.0 92%
Worcester Greenstar Compact 36CDi £1,285 7 10 24KW 12.9 94%
Worcester Greenstar Classic 34CDi £1,225 7 10 30KW 12.0 92%
Baxi Ecoblue Advance 28 £1,060 10 10 24KW 11.5 89%
Baxi Platinum 28 £955 10 10 28KW 11.5 89%
Ideal/Vogue C32 £1,245 8 10 26KW 13.1 91%
Viessmann Vitodens 200 30KW £1,435 3 5 30KW 12.3 90%
Large
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Worcester Greenstar Classic 38CDi £1,395 7 10 30KW 14.0 92%
Baxi Ecoblue Advance 33 £1,175 10 10 28KW 13.5 89%
Baxi Platinum 33 £1,110 10 10 33KW 13.5 89%
Viessmann Vitodens 200 35KW £1,620 3 5 35KW 14.3 90%
Vaillant ecoTEC plus 832 £1,226 5 7-10 24KW 13.0 89%
Vaillant ecoTEC plus

OVERALL BEST BUY

835 £1,110 5 7-10 30KW 14.3 89%
Vaillant ecoTEC Green iQ 835 £1,651 5 7-10 25KW 14.5 94%
Extra Large
Manufacturer/Model Code Price Standard Warranty Free Extended Warranty Heating output (Size) Litres per minute for hot water Efficiency
Vaillant ecoTEC plus 838 £1,570 5 7-10 29KW 15.9 89%
Worcester Greenstar Classic 42CDi £1,665 7 10 30KW 15.0 92%
Baxi Ecoblue Advance 40 £1,240 10 10 32KW 16.4 89%
Baxi Platinum 40 £1,225 10 10 40KW 16.4 89%
Vaillant ecoTEC Green iQ 843 £1,979 5 7-10 33KW 17.8 94%
Ideal/Vogue C40 £1,399 8 10 32KW 16.4 91%

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