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Discover our wide range of system gas boilers, designed to be mounted on walls or standing freely on floors. Up to 10-years warranty available on selected items.

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Built on all the tried, tested and much-loved features of the Greenstar i, the Greenstar 4000 is instantly familiar and yet totally transformed in appearance, performance and installer plus points. We’ve raised the bar with the speed and ease of installation, commissioning and servicing, alongside improvements in efficiency and control.
Boiler Type
Combi
Maximum Vertical Flue 125mm
21m
Manufacturer Model No
7733600385
Brand Name
Worcester Bosch

£1,569.71

each (Inc. VAT)
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The Ultimate 3 Combi Boiler is Glow-worm’s high performance, ErP A rated boiler range developed for the one off installer market, and exclusively manufactured for Travis Perkins. Available in a choice of 30kW and 35kW models and offers both high DHW flow rates and flexible flue options. The high performance model features a manual pressure gauge for easy installation and a modern, bright, LCD display with a simple-to-use interface
Boiler Type
Combi
Depth
300 mm
Height
740 mm
Width
418 mm
Maximum Horizontal Flue 100mm
9 m
Maximum Horizontal Flue 125mm
25 m
Maximum Vertical Flue 100mm
9 m
Maximum Vertical Flue 125mm
25 m
External or Internal
Internal
DHW Flow Rate at 35 Degree Rise
10.4 L/min
SEDBUK SAP 2009 Rating
89.20%
SEDBUK SAP 2005 Rating
90.90%
CH Condensing Max Output
26.5 kW
Heat Output
30 kW
Fuel Type
Natural Gas
Includes
Boiler Only
Noise Level
51 dB
Nox Class
5
Solar Compatible
N
Type
Boiler
Years Guaranteed
5
Registered with the Energy Savings Trust
Y
Made To Order
N
Manufacturer Model No
10016124
Country Origin
Germany
Brand Name
Glow-Worm
Range Description
Ultimate2 Range

£917.77

each (Inc. VAT)
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The Ultimate3 regular (open vent) boiler is suitable for homes with high hot water demands. The Ultimate3 regular heat only boiler is available in a 25kW output and has been designed to be light and compact with cupboard fit dimensions. The boiler features flexible flue options and an aluminium heat exchanger for proven reliability and performance. Parts and labour are guaranteed for 5 years.
ERP Rating
A
ERP Efficiency
94%
Boiler Type
Heat Only
Depth
300 mm
Height
740 mm
Width
418 mm
Maximum Horizontal Flue 100mm
10 m
Maximum Horizontal Flue 125mm
10 m
Maximum Vertical Flue 100mm
10 m
Maximum Vertical Flue 125mm
25 m
External or Internal
Internal
SEDBUK SAP 2009 Rating
89%
SEDBUK SAP 2005 Rating
91%
CH Condensing Max Output
26.5 kW
Heat Output
30 kW
Fuel Type
Natural Gas
Includes
Boiler Only
Noise Level
51 dBA
Solar Compatible
N
Type
Boiler
Years Guaranteed
5
Made To Order
N
Manufacturer Model No
10021408
Brand Name
Glow-Worm
Range Description
Ultimate3

£1,020.00

each (Inc. VAT)
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With a central heating output of 25 kW and a hot water flow rate of 10.4 litres/min the Glow-worm Energy 25C combi boiler is a popular choice for use in smaller properties such as flats, apartments and houses with 1-2 bedrooms and 1 bathroom. As a new ErP compliant boiler, the 25C has been built to meet the new EU regulations concerning energy efficiency and, as an A-rated boiler model, you can rest assured you will be getting a high efficiency heating performance, something that can be seen in utility bills benefit in the long run. The Energy 25C model features a super-efficient aluminium heat exchanger that is designed to last a lot longer than your typical copper or alloy heat exchangers. The innovatively designed heat exchanger is extremely quiet and emits little sound during operation. The 25C boiler model is nice and compact too so can fit in most typical kitchen cupboard spaces, helping to free up room in the home by hiding the boiler away out of sight.
ERP Efficiency
93%
ERP Rating
A
Boiler Type
Combi
Depth
280 mm
Height
700 mm
Width
390 mm
Maximum Horizontal Flue 100mm
10 m
Maximum Horizontal Flue 125mm
25 m
Maximum Vertical Flue 100mm
10 m
Maximum Vertical Flue 125mm
25 m
External or Internal
Internal
DHW Output
25.2 kW
DHW Response 1m from Tap
5 secs
DHW Flow Rate at 35 Degree Rise
10.4l/min
DHW Output Min and Max
5 kW
SEDBUK SAP 2009 Rating
A
SEDBUK SAP 2005 Rating
90.90%
CH Condensing Max Output
19.1 kW
Heat Output
25 kW
Fuel Type
Natural Gas
Includes
Boiler Only
Noise Level
49 dB
Nox Class
5
Solar Compatible
N
Type
Boiler
Years Guaranteed
7
Registered with the Energy Savings Trust
Yes
Made To Order
N
Manufacturer Model No
10015652
Brand Name
Glow-Worm

£1,233.28

each (Inc. VAT)
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Worcester Greenstar 4000 24kW System 7733600385
Worcester Greenstar 4000 24kW System 7733600385
Built on all the tried, tested and much-loved features of the Greenstar i, the Greenstar 4000 is instantly familiar and yet totally transformed in appearance, performance and installer plus points. We’ve raised the bar with the speed and ease of installation, commissioning and servicing, alongside improvements in efficiency and control.
£1,569.71 each (Inc. VAT)
Glow-worm Ultimate3 Combi 30kW Gas Boiler
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The Ultimate 3 Combi Boiler is Glow-worm’s high performance, ErP A rated boiler range developed for the one off installer market, and exclusively manufactured for Travis Perkins. Available in a choice of 30kW and 35kW models and offers both high DHW flow rates and flexible flue options. The high performance model features a manual pressure gauge for easy installation and a modern, bright, LCD display with a simple-to-use interface
£917.77 each (Inc. VAT)
Glow-worm Ultimate3 25kW Heat Only Gas Boiler ErP
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The Ultimate3 regular (open vent) boiler is suitable for homes with high hot water demands. The Ultimate3 regular heat only boiler is available in a 25kW output and has been designed to be light and compact with cupboard fit dimensions. The boiler features flexible flue options and an aluminium heat exchanger for proven reliability and performance. Parts and labour are guaranteed for 5 years.
£1,020.00 each (Inc. VAT)
Glow-worm Energy Combi 25kW Gas Boiler
Glow-worm Energy Combi 25kW Gas Boiler
With a central heating output of 25 kW and a hot water flow rate of 10.4 litres/min the Glow-worm Energy 25C combi boiler is a popular choice for use in smaller properties such as flats, apartments and houses with 1-2 bedrooms and 1 bathroom. As a new ErP compliant boiler, the 25C has been built to meet the new EU regulations concerning energy efficiency and, as an A-rated boiler model, you can rest assured you will be getting a high efficiency heating performance, something that can be seen in utility bills benefit in the long run. The Energy 25C model features a super-efficient aluminium heat exchanger that is designed to last a lot longer than your typical copper or alloy heat exchangers. The innovatively designed heat exchanger is extremely quiet and emits little sound during operation. The 25C boiler model is nice and compact too so can fit in most typical kitchen cupboard spaces, helping to free up room in the home by hiding the boiler away out of sight.
£1,233.28 each (Inc. VAT)