How does a heat pump heater work

A Heat Pump operates on electricity, but sun-warmed air contributes
to their efficiency because the heat extracted from the air is
upgraded with a compressor and then transferred to the water, heating
it.
 

• How do heat pump heaters work?
• Heat pump energy rating and efficiency
• Cost to operate a heat pump heater
• The size heat pump heater required
• Longevity and maintenance of your heat pump