Gas-fired boilers and systems

Our Greenstar gas condensing boilers run at 90% efficiency or over and have been designed to blend in with other domestic appliances.

The gas condensing boilers are listed below. If you’d like to know more about which boiler would suit your requirements please use our Find a Boiler search.

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Combi

What is a
Combi boiler?

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Product	Features
Greenstar 42CDi	90.1% A
Greenstar 37CDi	90.1% A
Greenstar 30CDi	90.1% A
Greenstar 27CDi	90.2% A
Greenstar 30Si	90.1% A
Greenstar 25Si	90.1% A
Greenstar 28i junior	90.1% A
Greenstar 24i junior	90.1% A
Greenstar Highflow 550CDi	90.4% A
Greenstar Highflow 440CDi	90.4% A

Regular

What is a
Regular boiler?

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Product	Features
Greenstar 40CDi Conventional	90.2% A
Greenstar 30CDi Conventional	90.3% A
Greenstar FS 42CDi Regular	90.3% A
Greenstar FS 30CDi Regular	90.5% A
Greenstar 24Ri	90.2% A
Greenstar 18Ri	90.1% A
Greenstar 15Ri	90.1% A
Greenstar 12Ri	90.1% A