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Heat Pumps
The Science behind heat pumps...

The principle is very similar to the operation of a refrigerator, but in reverse. There is latent heat energy in the air and this is transferred to the heating system.

The heat pump system contains extremely cold liquid refrigerant, which travels through a copper pipe. The air passing through this evaporator contains latent heat which is absorbed by the refrigerant. A compressor then pulls the refrigerant inside where it is naturally compressed.

As the pressure rises, the temperature increases. From here the refrigerant travels to the condenser, where the heat from the refrigerant is transferred to the water tank.

An expansion valve finally provides the pressure reduction to the refrigerant and the cycle starts again.

Heat pumps are easy to install as they just replace the old electric system. They have a fan that runs 6 to 7 hours a day and this can be at night. Noise would be the greatest complaint from users of these systems.

Warranty for heat pumps is generally 5 years on the tank and 2 years on the compressor unit.  Installation and other parts are warranted for 12 months.