The heat pump most suited to each situation is determined by a number of factors. When combining the heating for a swimming and underfloor, sizing priority is given to the area 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, underfloor area, building structure 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 and underfloor area based on modern insulated houses with a 2.4m stud as listed:

7KW Pool & 5kW Underfloor HEAT PUMP - 7GP7U5-1 or 7GP7Ub5-1 (Ub model includes buffer tank & circulation pump)

• 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. 
• Underfloor area of up to 104m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 80m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellingon.
• Underfloor area of up to 61m² (providing 85 Watts/m²) for the Central Plateau and South Island.

11KW Pool & 8kW Underfloor HEAT PUMP - 7GP11U8-1 or 7GP11Ub8-1 (Ub model includes buffer tank & circulation pump)

• 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. 
• Underfloor area of up to 154m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 118m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellingon.
• Underfloor area of up to 91m² (providing 85 Watts/m²) for the Central Plateau and South Island.

14KW Pool & 9kW Underfloor HEAT PUMP - 7GP14U9-1 or 7GP14Ub9-1 (Ub model includes buffer tank & circulation pump)

• Residential Pool (up to 4 hours per day uncovered) with a surface area up to 65m²for 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. 
• Underfloor area of up to 180m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 138m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellingon.
• Underfloor area of up to 106m² (providing 85 Watts/m²) for the Central Plateau and South Island. 

Ideal applications

• Swimming pool and underfloor
• Indoor pool heating and air heating

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.