When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Example 1: Solar hot water circulation, high temperature sensor — low temperature sensor> 5.0 degrees, action relays, the difference back to 4.5 degrees is off. The low temperature sensor is larger than the high temperature sensor and the relay does not move.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.