I don't believe it's cheaper to heat water by gas any more (unless the central heating is on anyway) as you end up heating the water in the whole system, which is let cool down again and therefore a waste.
It requires energy to heat a tank of water, this is the same amount of energy whether you are using gas or electricity. When you run this off the central heating, the temperature of the water being circulated to the rads drops as it travels through the coil in the water tank. So you end up needing to leave the central heating on that bit longer to raise the temperature of the house to the required level.
Leo
Have you thought about getting a timer on the immersion?
Most houses have the ability to just heat hot water only from the central heating boiler. I.E the radiator circuit is shut down. I rarely use my immersion. Next time you have it on watch your meter spin.
If you turn of all the rads and turn on the boiler does this use the same amount of gas as if you had a seperate setting on your boiler for turning off the central heating circuit?
Any mathematicians?
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