A BOILER expert has revealed how two secret buttons on your boiler could save you up to £325 a year on your energy bills. Around 80% of new boilers sold in the UK are combi boilers, according to ...

But less than 1% currently have these installed, while 80% of UK homes have a gas boiler. Whether you're considering making the switch to a heat pump now, or just interested in how they work, here's ...