Inline water heater – what does it do? Why is an immersion heater not being used as the primary domestic hot water system?
A 4,200 litre water battery is being used as the primary energy store for the under floor heating system. This tank is constructed from GRP and is insulated with 200mm Celotex foam insulation. This will only lose 0.5 of a degree over 100 hours if left unused. To take advantage of this energy resource we are using a large Titanium coil to preheat the domestic hot water. The coil is sited in the top part of the tank and takes advantage of heat convection. The water main passes through the coil and is forced upstairs by gravity pressure into the insulated stainless steel tank. When you turn on a hot water tap or shower, the inline water heater samples the incoming temperature 12 times a second and raises the water temperature on demand to the required preset temperature. This system removes the need for a cold water header tank.
