Plate to Plate Heat Exchangers
Plate to Plate Heat Exchangers have a series of stainless steel plates running along side each other - one plate carries primary water, the other carries domestic water. These plates are layered alternatively so that a number of plates will form the primary circuit and an equal number will form the domestic circuit. The more plates there are the quicker the heat transfer. The domestic and primary water pass through the plate heat exchanger in opposite directions to maximise heat transfer. Because of the size of each plate they are prone to being blocked by debris - more often than not because the heating system has not been properly flushed. It is unusual for calcium to build up in the domestic plates as the domestic water is heated from the primary water when there is a hot water demand.