I am planning a possible house selfbuild (yes, I know the economic climate is dodgy but thats another story) and as the location is rural the only options I have for a wet central heating system are oil, LPG or electric. I have used oil and LPG in the past and the prices of both can fluctuate wildly as you would expect. I have been toying with the idea of an electric combi boiler but am aware that running costs could be high but do not know exactly how high that would be (in comparison to to oil or LPG). The advantages would be no outside tank or associated pipework, no flue poking out of the roof and not having to remember to order a top-up. Does anyone actually have an electric combi (or has had one in the past)? If so how were the running costs?