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Addressing environmental issues is a big topic. There are many different ways to approach these issues, some based on individual actions and others on collective actions, some passive, some active. the greentomato way is to live our lives and build businesses according to a set of values that we think are pragmatic and can make a real difference. But we are always keen to hear new ideas, to challenge our assumptions and to improve and accelerate our progress. We think improving the world should be an inclusive, democratic process underpinned by transparency and debate. We believe any genuine attempt to improve the world we live in should be listened to and discussed. We provide a platform for these debates through an open blog.  Let us know what you think on our blog page.

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.