District heat is the most common form of heating in Finland. Almost half of the heating and hot tap water required by all buildings in the country is produced with district heat. Customers appreciate district heating due to its competitive price and excellent features, such as security of supply and ease of use.
District heat is produced in combined heat and power (CHP) plants or in heating plants. District heating fuels include wood and other renewable energy sources, as well as natural gas, coal, peat and, to a lesser extent, oil.
Heat is conducted to customers as hot water in a dual-pipe district heating network located underground, usually under streets and cycle paths. The hot water in the supply pipe releases heat to the heating and hot water networks of the property through the customer’s heat exchanger. Once cooled down, the water in the district heating network returns from the heat exchanger to the production plant for reheating.