I am about to build my first solar water heating system my design will be a pumped sytem solar powered.I would like to heat the water to the maximum temp possible with a cut out below boiling and would have the system pump when the temp in the collector is above the storage tank temp and stop when tank temp is above collector temp.Because the system is not passive (syphonic) I can put my tank anywhere may be under the house and because I live in a frost prone area the collector would have a thermostatically switched pump to feed water into the collector when the collector temp aproaches freezing.
My problem is I need a temperature differential controller (when collector is above tank temp pump when tank temp is above collector stop) there are no set temps as they would float up to a max temp preset as a stop to prevent boiling. Does anyone know of a unit of this type could they point me in the right direction to buy one.
My problem is I need a temperature differential controller (when collector is above tank temp pump when tank temp is above collector stop) there are no set temps as they would float up to a max temp preset as a stop to prevent boiling. Does anyone know of a unit of this type could they point me in the right direction to buy one.