The heat pump most suited to each situation is determined by a number of factors; the surface area of the pool, pool use, whether the pool has a cover and the time the pool is covered, local temperature and weather conditions. 

For heat pump sizing for the duration of use your require, please contact Hot Water Heat Pumps. As a general guide to heat pump requirements for an extended season of swimming from mid October to mid April: 

7kW Heat Pump - 7GP7-1 

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 35m² for most of the North Island, up to 29m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 26m² for most of the North Island, up to 21m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 23m² for most of the North Island, up to 12m² for the Central North Island and South Island. 

11kW Heat Pump - 7GP11-1 

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 55m² for most of the North Island, up to 50m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 40m² for most of the North Island, up to 33m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 33m² for most of the North Island, up to 17m² for the Central North Island and South Island. 

14kW Heat Pump - 7GP14-1

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 65m² for most of the North Island, up to 60m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 48m² for most of the North Island, up to 43m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 38m² for most of the North Island, up to 22m² for the Central North Island and South Island. 

Ideal applications

• Swimming pool
• Spa heating
• Hydroponics

All of Hot Water Heat Pumps' residential heat pump pool heater models carry a comprehensive two year parts and labour warranty, including the compressor, evaporator coils, heat exchanger and refrigeration systems. The titanium tube within the heat exchanger is covered against corrosion for 30 years for residential use and 10 years for commercial use.

The heat pump water heaters are fitted with protection systems to prevent damage in the event of a malfunction. Such as a flow switch to ensure the heat pump cannot operate without water flow and other refrigeration safeties. If a problem is identified, the unit automatically shuts down before damage can occur.