How to run or set your central heating is one of those age old questions that doesn't have a simple answer. Many people advocate that you should only use your heating when you need it, others say it should be on at a low level all the time and then increased when it is particularly cold. While we can't give you a definitive answer there are some simple guidelines that can really help get the best out of your central heating.
1. If you have a home with a high thermal mass then having it on low 24 hours a day is a god thing. High thermal mass means that it takes a long time for your house to fully warm up, so letting it cool completely isn't a good idea. Generally your home will have a high thermal mass if it is old, has solid walls (rather than cavity walls) or is susceptible to damp. Homes like this generally don't like being left to completely cool down so, if you can, it's best to leave your central heating ticking over at a low level 24 hours a day (thermostat set to 15 °C) and then warmer when you're in or feel you need it.
2. If you're living in a home with a low thermal mass, like a new-build home or one with lots of insulation then your best bet is to only have the heating on when you need (or want it) and then leave it off the rest of the day. These homes need considerably less energy to heat up compared to those above and so running your heating at a low level 24 hours a day just isn't required.
In either case, the best thing is to make sure your home is well insulated and you've excluded all those pesky draughts, otherwise you're just leaking heat needlessly - and of course, with our warmer home guarantee, buying a Radfan is a particularly good, risk free, idea.