Water Heating and Cooking
Water heating uses 4000 to 4500kWh/year in the typical home with mains gas. This is about one third of the gas used for space heating. In terms of kilowatt hours, water heating is more important than the entire electricity consumption of the home. However, the cost of water heating will be lower because heat is generally provided by gas, and not by the more expensive electricity. This chapter assumes that both cooking and water heating use mains gas.