It's the two cars and the very thirsty Mitsubishi Ecodan 14kW heat pump. It's very efficient, giving a COP of 2.4 to 2.5 on average (for every 1kW of electric used it generates approximately 2.5kW of heat) but does use a lot of electricity to do that. And we need a lot of heat for the bungalow... No gas means all electric cooking too and those sausage rolls don't cook themselves!