Thursday, January 10, 2013
Our solar water heater will use standard parts. It will include two standard electric water heaters, one will be used as a solar tank. The heat will be transferred to the main water heater with a heat exchanger. The two electric heating elements will be removed from the solar tank, providing two access ports to connect the heat exchanger. The lower heating element on the main tank will also be removed, and a special tee will be connected to provide inlet and outlet to the heat exchanger. The upper heating element will stay for backup. The temperature settings will be 140F for the solar tank, and 130F for the main tank. A mixing valve will keep the hot water going out at 100F. The electric element will be set at 100F, which will be the min hot water temperature. Total cost (not counting the existing water heater) is about $1200. Payback is 2 years, assuming $50/month savings.
Posted by Andre Lochin at 9:28 AM