The g-save was tested by Good Housekeeping Magazine (February 2009), where savings were 31% during the week tested

A gadget to cut heating bills

What is it?

The g-save is a small device that wires into your central heating to optimise the amount of fuel the boiler uses. Often there's a time lag between the thermostat signalling the need for heat and the system registering the temperature has been reached, resulting in overheating and wasted energy. The manufacturer claims it can reduce running costs by 17% to 31%.

How does it work?

The g-save has two timers, usually connected to the room thermostat and hot water cylinder thermostat. They monitor the heat already circulating in the system to ensure the boiler fires only when necessary.

How much does it cost?

£99 (incl VAT and p+p) unfitted.

Why would I want it?

Anything that helps cut costs has to be worth considering. It should also reduce carbon dioxide emissions from your home.

Is it any good?

We monitored the gas consumption of a four-bedroom house for two weeks, with and without the g-save. Gas consumption was 31% lower in the g-save week, which would work out at a saving of £165 over a year if it was maintained.

NOTE: Pricing has been reduced to £99. For more information about the g-save Economiser .