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Greentomato is an increasingly recognised brand with a clear mission
based on a strong set of values. The brand makes a compelling
commercial proposition: if all other things are equal, a product that
is also environmentally-friendly has a competitive advantage over the
rest. Do you have an idea that fits this proposition? If so, please get
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My boiler is 90% efficient; there is almost no room for improvement.

Truth: A “heat pump” can produce 4... read more

My boiler is 90% efficient; there is almost no room for improvement.


Truth: A “heat pump” can produce 4 units of heat for every unit of electrical input. Thus by a conventional definition it is 400% efficient, a big improvement on your boiler! (To avoid confusion, a different measure of efficiency called the Coefficient of Performance, or CoP, is used in heat pumps).


However, the really large fuel bill savings will come from insulating, airtighting and replacing windows in a house to mean that the boiler (or heat pump) does not have to produce so much energy in the first place.