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:

100kW Heat Pump - 7GP100-3 & 7GP100-3v (3 Phase) 

Note: v model is taller and narrower than standard models

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 450m² for most of the North Island, up to 420m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 427m² for most of the North Island, up to 322m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 290m² for most of the North Island, up to 240m² for the Central North Island and South Island. 

120kW Heat Pump - 7GP120-3 & 7GP120-3v (3 Phase) 

Note: v model is taller and narrower than standard models

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 540m² for most of the North Island, up to 500m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 466m² for most of the North Island, up to 396m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 350m² for most of the North Island, up to 297m² for the Central North Island and South Island. 

140kW Heat Pump - 7GP140-3 & 7GP140-3v (3 Phase) 

Note: v model is taller and narrower than standard models

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 630m² for most of the North Island, up to 580m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 547m² for most of the North Island, up to 448m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 360m² for most of the North Island, up to 350m² for the Central North Island and South Island. 

For Heat Pumps suitable for larger pools please contact us. 

Ideal applications

• Swimming pool
• Spa heating
• Hydroponics

All 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.

Heat pump water heaters are fitted with protection systems to prevent damage in the event of a malfunction. For example 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.