Heat pumps are widely accepted as the most economic method of reliably heating your swimming pool to a constant temperature. Unlike fuel boilers, a heat pump will produce up to five times the energy it consumes. For every one kilowatt of power consumed, a heat pump can produce up to five kilowatts of energy. The heat pump principle is based upon refrigeration technology. This technology has a unique ability to absorb energy from atmospheric air which it can then convert into useful heat.