sharing resources

as part of our work to make greentomato a reference point in the green
industry, we undertake research, meet a lot of people and have generally
gathered quite a lot of information about green issues. we would like to
share this information and our network with people and organisations
that would like to do the same with us. let us know if this is of interest to you.

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.