Hot water storage tanks and buffers
Storage tanks are cylindrical water tanks usually made of steel or stainless steel. They are insulated with polystyrene or polyurethane foam to minimise heat loss. In addition, the inside of the tank is enamelled to protect it from corrosion. A magnesium anode is also used to provide additional protection against corrosion. Storage tanks can reach a capacity of up to 500 litres and can be mounted standing or hanging. As a standard, the tanks are equipped with a single coil adapted to receive heat from a single source. They are also available with two or three coils for solar sets or water jacket.
The specificity of heat buffer operation is a layered water system. As the hot water is lighter than the cold water, it remains in the upper part of the storage tank, above the cold water. Interestingly, the water in the storage tank is not mixed. Thanks to its thermal insulation, the buffer stores water with low heat losses, allowing it to be used at any time, without the need to heat the entire buffer. Water buffers are usually used in combination with a solid fuel boiler, reaching a capacity of more than 1000 litres.