freezing weather

The freezing weather is playing havoc with my budget - normally we never have the heating on before January except as a treat on Christmas day - now as I write I hear the massive boiler pumping hot water round the system as it is based next door to my office - this is not just to heat the house - that is a minor consideration - it is to ensure that the pipes don't freeze and that we don't have a water disaster when the thaw sets in.  we have already had two burst pipes with consequent damage and I don't want a third.