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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.

greentomatoenergy can help you with: working for a clean energy future, about us, frequently asked questions, generate, save energy, build, Work with us, privacy, Solar case studies, contact us, your home, your business, your community, large scale developments, installers, values, environmental policy, environment, credentials, greentomatogroup, press, solar thermal, solar pv, wind energy, air source heat pumps, ground source heat pumps, consultancy, ventilation and heat recovery, insulation, windows, money matters, water, new build, what is passivhaus?, retrofit, techy stuff, is solar thermal for you?, money matters, why greentomatoenergy, techy stuff, is solar pv for you?, is an air source heat pump for you?, techy stuff, why greentomatoenergy?, money matters, money matters, why greentomatoenergy?, techy stuff, Is a ground source heat pump for you?, why greentomatoenergy?, techy stuff, is consultancy right for you?, why greentomatoenergy?, techy stuff, is mvhr right for you?, why greentomatoenergy?, techy stuff, is insulation right for you?, why greentomatoenergy?, techy stuff, is double-glazing for you?, why greentomatoenergy?, techy stuff, is water conservation for you?, feedback, solar pv questionnaire, solar thermal questionnaire, installers questionnaire, website terms and conditions, terms and conditions of sale, meet the team, Energy Company PV Registration Forms, consultancy case studies