This week DH measured the amount of heating oil in the tank, we haven't had a delivery since March. Instead we use the wood burning stove, lit from about 3.30 p.m. with the boiler on in the background. Once the room heats up, the thermostat is switched down. The boiler heats the bathroom so we don't leave it on to heat the radiators until we are up each morning.
In the Summer we use the immersion heater for hot water bathing. All year we use the kettle to wash up in the sink, make tea/coffee etc.. Rarely do I run hot water from the tank for washing up.
My biggest problem is the small cloakroom sink which is as far away from the hot water tank as is possible! I would like to put a small heater-unit, similar to that in showers, so that I don't have to run lots of cold water away to get it warm enough to wash hands. Hints on a postcard please