How it works:

The system operates on the same principle as an air conditioner

instead of cooling it works in reverse and heat is transfered instead. The basic principle is this:The fan forces out the air by doing this the heat of the is suck through the air evaporator coil transfers the heat to the refrigerator liquid. This is pumped through the system with the compressor this transfers the heat inside the heat exchanger and heats up the water as it passes through to the system to the geyser. This system is the most economical and logical way to heat up your geyser as an alternate way  to use than solar heating but this methord is only efficient if the sun is shining where as the heat pump worked 265 days of the year