Worcester Bosch Greenstar 25Si

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Greenstar 25Si Reviews (Combi Condensing)

Our rating: 5/5
Efficiency rating: 90.1%* A Rating

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Worcester-Bosch Greenstar 25Si

The Worcester-Bosch Greenstar 25Si is a small stylish domestic hot water and central heating boiler suitable for hanging on a kitchen wall, for example, in a small or medium-sized property. The Greenstar 25Si boiler offers a central heating output between 7.2kW and 24kW and hot water at a rate of 10.2 litres.

Being a combination condensing boiler the Greenstar 25Si provides rapid heating response and instant hot water but is also more than 90% efficient – compared to 75% or even 50% in some older types of boiler – and is rated "A" according to the SEDBUK ("Seasonal Efficiency in Domestic Boilers in the United Kingdom" database). This means that not only is the Worcester-Bosch Greenstar 25Si more economical to run but it reduces the amount of carbon dioxide (CO2) – the main "greenhouse" gas – that your household releases into the atmosphere. The Greenstar 25Si is available in a choice of natural gas-fired or LPG-fired models, LPG or "Liquified Petroleum Gas" being the generic name for propane and butane gases.

Other features of the Worcester-Bosch Greenstar 25Si are:

Compact dimensions of just H710mm x W440mm x D330mm and a weight of just 27kg allowing installation by just one individual in a variety of possible locations
Multi directional flue options – in 100mm and 125mm sizes – to add flexibility to installation
Worcester-Bosch 3 series heat cell constructed from cast aluminium and silicon
"Keep hot" facility to maintain the temperature of the primary heat cell
Low carbon dioxide (CO2) and nitrogen oxide(s) (NOx) emissions
Pump seizure protection during periods of inactivity

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* When review applies to a range of boilers, efficiency applies to best model in range. Always check with manufacturer.