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Best Gas System Boilers

Best Gas System Boilers

The best gas system boilers on the market


1. Vaillant ecoTEC Plus 612

Our score rating: 95.72%

Efficiency rating
92%
Band rating
A
Output in kW
12 kW
Height
720 mm
Width
440 mm
Depth
372 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

2. Vaillant ecoTEC Plus 615

Our score rating: 95.20%

Efficiency rating
93%
Band rating
A
Output in kW
15 kW
Height
720 mm
Width
440 mm
Depth
338 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

3. Vaillant ecoTEC Plus 618

Our score rating: 94.37%

Efficiency rating
94%
Band rating
A
Output in kW
18 kW
Height
720 mm
Width
440 mm
Depth
372 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,100

4. Vaillant ecoTEC Plus 624

Our score rating: 93.33%

Efficiency rating
94%
Band rating
A
Output in kW
24 kW
Height
720 mm
Width
440 mm
Depth
372 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,300

5. Worcester Bosch Greenstar i System 9i

Our score rating: 92.89%

Efficiency rating
93%
Band rating
A
Output in kW
9 kW
Height
710 mm
Width
400 mm
Depth
330 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

6. Vaillant ecoTEC Plus 630

Our score rating: 92.75%

Efficiency rating
94%
Band rating
A
Output in kW
30 kW
Height
720 mm
Width
440 mm
Depth
372 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,400

7. Worcester Bosch Greenstar 4000 12kW

Our score rating: 92.50%

Efficiency rating
94%
Band rating
A
Output in kW
12 kW
Height
724 mm
Width
400 mm
Depth
310 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

8. Vaillant ecoTEC Exclusive IQ 627

Our score rating: 92.42%

Efficiency rating
94%
Band rating
A
Output in kW
27 kW
Height
720 mm
Width
440 mm
Depth
338 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,400

9. Vaillant ecoFIT Pure 612

Our score rating: 92.38%

Efficiency rating
94%
Band rating
A
Output in kW
12 kW
Height
700 mm
Width
390 mm
Depth
295 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

10. Vaillant ecoFIT Pure 615

Our score rating: 92.36%

Efficiency rating
94%
Band rating
A
Output in kW
15 kW
Height
700 mm
Width
390 mm
Depth
295 mm
Mounting
Wall
Fuel
Gas
ERP Rating
A

Supply and installation around £2,000

Other gas system boilers to consider

Range and model Rating Estimated price
Vaillant ecoTEC Plus 637 92.05% £2,500
Worcester Bosch Greenstar i System 12i 91.98% £2,100
Worcester Bosch Greenstar 4000 15kW 91.93% £2,100
Vaillant ecoFIT Pure 618 91.68% £2,100
Worcester Bosch Greenstar i System 27i 91.58% £2,100
Worcester Bosch Greenstar i System 15i 91.55% £2,100
Worcester Bosch Greenstar 8000 Life System 30kW 91.40% £2,300
Worcester Bosch Greenstar i System 30i 91.19% £2,100
Ferroli Bluehelix 18S 91.17% £1,600
Worcester Bosch Greenstar i System 18i 91.13% £2,200
Vaillant ecoTEC Plus 637
PP Score 92.05% Est price

£2,500

Worcester Bosch Greenstar i System 12i
PP Score 91.98% Est price

£2,100

Worcester Bosch Greenstar 4000 15kW
PP Score 91.93% Est price

£2,100

Vaillant ecoFIT Pure 618
PP Score 91.68% Est price

£2,100

Worcester Bosch Greenstar i System 27i
PP Score 91.58% Est price

£2,100

Worcester Bosch Greenstar i System 15i
PP Score 91.55% Est price

£2,100

Worcester Bosch Greenstar 8000 Life System 30kW
PP Score 91.40% Est price

£2,300

Worcester Bosch Greenstar i System 30i
PP Score 91.19% Est price

£2,100

Ferroli Bluehelix 18S
PP Score 91.17% Est price

£1,600

Worcester Bosch Greenstar i System 18i
PP Score 91.13% Est price

£2,200

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    The best gas system boilers on the market

    1. Vaillant ecoTEC Plus 612

    Our score rating: 95.72%

    Efficiency rating
    92%
    Band rating
    A
    Output in kW
    12 kW
    Height
    720 mm
    Width
    440 mm
    Depth
    372 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,000

    2. Vaillant ecoTEC Plus 615

    Our score rating: 95.20%

    Efficiency rating
    93%
    Band rating
    A
    Output in kW
    15 kW
    Height
    720 mm
    Width
    440 mm
    Depth
    338 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,000

    3. Vaillant ecoTEC Plus 618

    Our score rating: 94.37%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    18 kW
    Height
    720 mm
    Width
    440 mm
    Depth
    372 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,100

    4. Vaillant ecoTEC Plus 624

    Our score rating: 93.33%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    24 kW
    Height
    720 mm
    Width
    440 mm
    Depth
    372 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,300

    5. Worcester Bosch Greenstar i System 9i

    Our score rating: 92.89%

    Efficiency rating
    93%
    Band rating
    A
    Output in kW
    9 kW
    Height
    710 mm
    Width
    400 mm
    Depth
    330 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,000

    6. Vaillant ecoTEC Plus 630

    Our score rating: 92.75%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    30 kW
    Height
    720 mm
    Width
    440 mm
    Depth
    372 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,400

    7. Worcester Bosch Greenstar 4000 12kW

    Our score rating: 92.50%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    12 kW
    Height
    724 mm
    Width
    400 mm
    Depth
    310 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,000

    8. Vaillant ecoTEC Exclusive IQ 627

    Our score rating: 92.42%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    27 kW
    Height
    720 mm
    Width
    440 mm
    Depth
    338 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,400

    9. Vaillant ecoFIT Pure 612

    Our score rating: 92.38%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    12 kW
    Height
    700 mm
    Width
    390 mm
    Depth
    295 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,000

    10. Vaillant ecoFIT Pure 615

    Our score rating: 92.36%

    Efficiency rating
    94%
    Band rating
    A
    Output in kW
    15 kW
    Height
    700 mm
    Width
    390 mm
    Depth
    295 mm
    Mounting
    Wall
    Fuel
    Gas
    ERP Rating
    A

    Supply and installation around £2,000

    Other gas system boilers to consider

    Range and model Rating Estimated price
    Vaillant ecoTEC Plus 637 92.05% £2,500
    Worcester Bosch Greenstar i System 12i 91.98% £2,100
    Worcester Bosch Greenstar 4000 15kW 91.93% £2,100
    Vaillant ecoFIT Pure 618 91.68% £2,100
    Worcester Bosch Greenstar i System 27i 91.58% £2,100
    Worcester Bosch Greenstar i System 15i 91.55% £2,100
    Worcester Bosch Greenstar 8000 Life System 30kW 91.40% £2,300
    Worcester Bosch Greenstar i System 30i 91.19% £2,100
    Ferroli Bluehelix 18S 91.17% £1,600
    Worcester Bosch Greenstar i System 18i 91.13% £2,200
    Vaillant ecoTEC Plus 637
    PP Score 92.05% Est price

    £2,500

    Worcester Bosch Greenstar i System 12i
    PP Score 91.98% Est price

    £2,100

    Worcester Bosch Greenstar 4000 15kW
    PP Score 91.93% Est price

    £2,100

    Vaillant ecoFIT Pure 618
    PP Score 91.68% Est price

    £2,100

    Worcester Bosch Greenstar i System 27i
    PP Score 91.58% Est price

    £2,100

    Worcester Bosch Greenstar i System 15i
    PP Score 91.55% Est price

    £2,100

    Worcester Bosch Greenstar 8000 Life System 30kW
    PP Score 91.40% Est price

    £2,300

    Worcester Bosch Greenstar i System 30i
    PP Score 91.19% Est price

    £2,100

    Ferroli Bluehelix 18S
    PP Score 91.17% Est price

    £1,600

    Worcester Bosch Greenstar i System 18i
    PP Score 91.13% Est price

    £2,200

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