Can Mini Split Heat Pumps Handle Hot Water Heating?

Hot Water Heating Capacity

Mini split heat pumps can efficiently provide hot water heating when the temperature difference between the source water and the desired hot water temperature is relatively small. For example, if the source water temperature is around 50°F (10°C) and the desired hot water temperature is around 104°F (40°C), a well-designed mini split heat pump system can provide the necessary heat with an efficiency of around 2-3 units of electricity per unit of heat. However, if the temperature difference is large, such as 50°F (10°C) to 140°F (60°C), the system may become less efficient.

System Design Considerations

When designing a mini split heat pump system for hot water heating, it’s essential to consider the system’s capacity, which is typically measured in British Thermal Units (BTUs) per hour. For example, a 12,000 BTU system can provide around 10 gallons of hot water per hour at a temperature difference of 50°F (10°C). Additionally, the system’s defrosting cycle should be considered, as it can significantly impact the system’s performance during cold outdoor temperatures. Proper system design can ensure efficient and reliable hot water heating with a mini split heat pump system.

Power Requirements

The power requirements of a mini split heat pump system for hot water heating depend on the system’s capacity and the temperature difference between the source water and the desired hot water temperature. As a general rule, a well-designed system can operate within the power range of 1-5 kW, depending on the system’s size and the temperature difference. For example, a 12,000 BTU system operating with a temperature difference of 50°F (10°C) may require around 2-3 kW of power to provide the necessary heat.