Combi Boiler Prices - We Compare 83 Boiler Models!

Who offers the best combi boiler prices in 2018? We compare combi boiler prices on 83 models of boiler including Worcester, Vaillant, Baxi and Ideal in the ULTIMATE guide to UK new boiler prices, sizes, efficiencies and warranties. 

The aim of this guide is to help you find the most suitable gas boiler for your property's size and your budget. We have looked in detail at the full range of A-rated condensing boilers from eight manufacturers: Worcester Bosch, Baxi, Viessmann, Potterton, Main, Ideal, Glow-worm, Vaillant and Ferroli. Well it’s about time!

Use our comprehensive tables below to find the perfect gas combi boiler price for you. We have broken the boiler ranges down as follows:

We have first divided the combi boilers into four price groups:

 Entry level (cheapest)
 Economy (one-up from Entry level)
 Mid-Range
​ Premium, the most expensive

We have then sub-divided each price group into four combi boiler sizes:

​The four sizes are governed by the heating output and hot water flow rates – very roughly - to show: Small, Medium, Large and Extra Large capacity boilers.

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. Prices are accurate as of January 2018 and are reviewed periodically.

Results Overview

We have found that not all manufacturers produce a boiler model for each of our budget groups or in each size of boiler. Where a manufacturer is not listed in the group they quite simply do not have a boiler model 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.

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. 

A few technical considerations

The tables below include key data on 1) heating out puts and 2) domestic hot water flow rates - expressed as Litres Per Minute (LPM). It is important to remember that for SOME combination boilers the heating 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 models, only the hot water flow rates vary: 9.9 LPM, 12.4 LPM and 14.5 LPM respectively.

In other words, the model ‘number’ is not always an indication of heating output, although it occasionally is (confusing we know). To make sizing clearer, we have included a separate column called ‘Heating Output (Size)’ which lists the actual heating output.

How much does it cost to install a boiler?

​This Guide focuses on boiler prices according to budget. For an estimate of installation costs you can use our other great tools (NB these tools give estimates, use the tables below for specific boiler prices):

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. 

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

OVERALL BEST BUY

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%

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

OVERALL BEST BUY

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%

Manufacturer/Model

Code

Price

Standard Warranty

Free Extended Warranty

Heating output (Size)

Litres per minute for hot water

Efficiency

Ideal Independent

OVERALL BEST BUY

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%

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

OVERALL BEST BUY

38KW

£764

5

5

34KW

16

89%

 

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.

Manufacturer/Model

Code

Price

Standard Warranty

Free Extended Warranty

Heating output (Size)

Litres per minute for hot water

Efficiency

Baxi/Duotec

OVERALL BEST BUY

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%

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

OVERALL BEST BUY

30

£694

5

5

25KW

12.5

89%

Potterton/Titanium

28

£798

7

7

24KW

11.5

91%

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

OVERALL BEST BUY

33

£858

7

7

28KW

13.5

91%

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

OVERALL BEST BUY

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.

Manufacturer/Model

Code

Price

Standard Warranty

Free Extended Warranty

Heating output (Size)

Litres per minute for hot water

Efficiency

Worcester Bosch/Greenstar

BEST PERFORMANCE

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

OVERALL BEST BUY

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%

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

BEST PERFORMANCE

30

£1021

2

5-10

24KW

12.3

89%

Ideal/Logic + Combi

OVERALL BEST BUY

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%

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

OVERALL BEST BUY

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

BEST PERFORMANCE

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.

Manufacturer/Model

Code

Price

Standard Warranty

Free Extended Warranty

Heating output (Size)

Litres per minute for hot water

Efficiency

Worcester Greenstar Compact

BEST PERFORMANCE

28CDi

£1,045

7

10

24KW

10.0

94%

Baxi Ecoblue Advance

24

£920

10

10

20KW

9.8

89%

Baxi Platinum

OVERALL BEST BUY

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%

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

BEST PERFORMANCE

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

OVERALL BEST BUY

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%

Manufacturer/Model

Code

Price

Standard Warranty

Free Extended Warranty

Heating output (Size)

Litres per minute for hot water

Efficiency

Worcester Greenstar Classic

BEST PERFORMANCE

38CDi

£1,395

7

10

30KW

14.0

92%

Baxi Ecoblue Advance

33

£1,175

10

10

28KW

13.5

89%

Baxi Platinum

OVERALL BEST BUY

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%

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

OVERALL BEST BUY

40

£1,225

10

10

40KW

16.4

89%

Vaillant ecoTEC Green iQ

BEST PERFORMANCE

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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