Eco cleaning products: Tried and Tested

g-save Economiser

Green credentials: The g-save unit cleverly connects to your central heating system and monitors the heat circulating through the pipes to optimise the amount of fuel the boiler uses by ensuring it fires only when necessary.

Good Housekeeping Green Living Awards verdict: In a two-week trial carried out in a four-bedroom house during winter, the gas consumption was 31% lower during the week the g-save was in use, which would work out at a saving of £165 in heating bills over a year if it was maintained. It can be used with gas, oil and liquid petroleum gas (LPG) boilers, including combination and condensing types.

£156 unfitted, £216 including installation: 0800 587 0666; www.gas-elec.co.uk