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Cont. Sanden recommends that the heat pump set-point should be at a minimum of 150°F for the combination of maximum hot water production and system efficiency. This setting will increase the total delivered recovery of the tank as the hot water from the tank will be mixed with cold water to provide the lower delivered water temperature to the home, to prevent scalding and potential injury. The ratio of hot water and cold water used can be calculated using this formula which was developed by ASPE. Heat pump set-point and average tank temperature 150°F Incoming Cold Water Temp 130°F Mixed Delivered Water Temp 125°F Mixed Delivered Water Temp 120°F Mixed Delivered Water Temp 115°F Mixed Delivered Water Temp 110°F Mixed Delivered Water Temp 40°F 0.82 0.77 45°F 0.81 0.76 50°F 0.80 0.75 55°F 0.79 0.74 60°F 0.78 0.72 0.73 0.68 0.64 0.71 0.67 0.62 0.7 0.65 0.6 0.68 0.63 0.58 0.67 0.61 0.56 For example: A 3 GPM hot water flow 120°F, and a cold incoming water temperature of 50°F will need 2.1 GPM of tank water and 0.9 GPM of cold water. This reduction in water usage from the tank results in greater hot water production from the tank and increased recovery rate of the DHW system when viewed as a whole. into the home with the mixing valve set for a temperature of 12PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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