The heat pump most suited to each situation is determined by a number of factors. When combining the heating for a underfloor heating and domestic hot water, sizing priority is given to the underfloor as it has the greatest load requirement. These factors include; 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:

5KW Underfloor & 4kW Domestic Hot Water HEAT PUMP - 7GU5D4-1 or 7GP5UbD4-1 (Ub model includes buffer tank & circulation pump)

• 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 Wellington.
• Underfloor area of up to 61m² (providing 85 Watts/m²) for the Central Plateau and South Island.

8KW Underfloor & 6kW Domestic Hot Water HEAT PUMP - 7GU8D6-1 or 7GP8UbD6-1 (Ub model includes buffer tank & circulation pump)

• 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 Wellington.
• Underfloor area of up to 91m² (providing 85 Watts/m²) for the Central Plateau and South Island.

9KW Underfloor & 8kW Domestic Hot Water HEAT PUMP - 7GU9D8-1 or 7GP9UbD8-1 (Ub model includes buffer tank & circulation pump)

• 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 Wellington.
• Underfloor area of up to 106m² (providing 85 Watts/m²) for the Central Plateau and South Island.

Ideal applications

• Underfloor and domestic hot water

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.