Thermosyphone solar water heater
A solar water heater is a device that uses sunlight (rather than the heat of the sun) to heat water. It enables substantial energy savings, as the sun shining on 1m² of roof replaces 100 l of heating oil or 100 m³ of natural gas (approximately 1 000 kWh) a year. Generally speaking, it is possible to heat 50 to 70 % of the water used in the kitchen and the bathroom in this way.
Supplying a washing machine or dishwasher with this hot water also cuts out the electricity used by these appliances to heat the water and shortens the washing cycles.