The heat pump most suited to each situation is determined by a number of factors. When combining the heating for a swimming pool and domestic hot water, sizing priority is given to the pool as it has the greatest load requirement. These factors include things such as; surface area of the pool, whether the pool has a cover and the time it is covered, and local temperature and weather conditions.

For more information about heat pump sizing 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 as listed:

20KW POOL & 10KW DOMESTIC HOT WATER HEAT PUMP - 7GP20D12-1 (SINGLE PHASE) & 7GP20D12-3 (THREE PHASE)

• 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. 

23KW Pool & 13kW Domestic Hot Water HEAT PUMP - 7GP23D13-1

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 110m² for most of the North Island, up to 95m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 80m² for most of the North Island, up to 71m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 68m² for most of the North Island, up to 58m² for the Central North Island and South Island. 

25KW Pool & 15kW Domestic Hot Water HEAT PUMP - 7GP25D15-3 (Three Phase)

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 105m² 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 85m² for most of the North Island, up to 75m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 74m² for most of the North Island, up to 63m² for the Central North Island and South Island. 

30KW Pool & 18kW Domestic Hot Water HEAT PUMP - 7GP30D18-3 (Three Phase)

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 150m² for most of the North Island, up to 125m² for the Central North Island and South Island.
• School Pool (up to 6 hours per day uncovered) with a surface area up to 113m² for most of the North Island, up to 102m² for the Central North Island and South Island.
• Commercial Pool (up to 12 hours per day uncovered) with a surface area of up to 91m² for most of the North Island, up to 75m² for the Central North Island and South Island. 

Ideal applications

• Swimming or spa pool.
• Swimming pool and domestic hot water.

All heat pump 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. 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.