The heat pump most suited to each situation is determined by a number of factors such as; floor area, insulation, building structure and climate. For more information about heat pump sizing please contact Hot Water Heat Pumps. As a general guide to heat pump requirements see models listed below:

33KW UNDERFLOOR HEAT PUMP - 7GU33-3 (Three PHASE)

• Underfloor area of up to 664m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 511m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellington.
• Underfloor area of up to 391m² (providing 85 Watts/m²) for the Central Plateau and South Island.

44KW UNDERFLOOR HEAT PUMP - 7GU44-3 (Three PHASE)

• Underfloor area of up to 830m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 638m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellington.
• Underfloor area of up to 488m² (providing 85 Watts/m²) for the Central Plateau and South Island.

63KW UNDERFLOOR HEAT PUMP — 7GU63-3 (THREE PHASE)

• Underfloor area of up to 1254m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 965m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellington.
• Underfloor area of up to 738m² (providing 85 Watts/m²) for the Central Plateau and South Island.

85KW UNDERFLOOR HEAT PUMP — 7GU85-3 (THREE PHASE)

• Underfloor area of up to 1694m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 1303m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellington.
• Underfloor area of up to 996m² (providing 85 Watts/m²) for the Central Plateau and South Island.

95KW UNDERFLOOR HEAT PUMP — 7GU95-3 (THREE PHASE)

• Underfloor area of up to 1898m² (providing 50 Watts/m²) for Northland, Auckland, and Coastal Bay of Plenty.
• Underfloor area of up to 1460m² (providing 65 Watts/m²) for Hamilton, Gisborne, Taranaki, Coastal Hawkes Bay and Wellington.
• Underfloor area of up to 1116m² (providing 85 Watts/m²) for the Central Plateau and South Island.

All of Hot Water Heat Pumps' 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.

These 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.