Is a hand pump compatible with a solar water heating system?

Choosing the Right Hand Pump

When selecting a hand pump for use with a solar water heating system, consider a pump with a low flow rate (less than 10 gallons per minute) to prevent overloading the solar system. A good option is a manual or diaphragm pump, which can handle low water pressures and flow rates. For example, the Boyer Manual Pump (flow rate: 3-5 GPM) or the DAB Diaphragm Pump (flow rate: 4-8 GPM) are suitable choices.

System Design Considerations

To ensure compatibility, the solar water heating system should be designed to provide a backup source of heat during periods of low solar radiation or nighttime. This can be achieved by implementing a thermal storage tank that can store excess heat generated during the day. The hand pump can then be used to circulate the stored hot water to the point of use, such as a shower or washing machine. A good rule of thumb is to have a minimum of 80 gallons of thermal storage capacity to provide 2-3 days of backup heat.

Installation and Maintenance

Proper installation and maintenance are crucial to ensure the hand pump and solar water heating system operate efficiently and safely. The hand pump should be installed at the highest point in the system to facilitate gravity-driven flow, and the system should be sized to accommodate the flow rate of the pump. Regular maintenance tasks, such as inspecting the pump and system components for wear and tear, should be performed to ensure reliable operation.