Originally Posted By: away
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I can't help you on the solar systems, if I come across one I defer it to someone who knows about them. I only know they use the sun to heat the water. ![icon_biggrin.gif](upload://iKNGSw3qcRIEmXySa8gItY6Gczg.gif)
As for a recirc pump, one way to see if it is operating is to check for hot water at the furthest faucet from the water heater, if it is hot or relatively warm and heats up quickly chances are the pump is operational. This can be tricky if the pump is on a timer or if homeowner had just run the hot water at all the faucets right before you check.
Keep in mind that some brands are thermostatically controlled and may not have cooled enough to trigger the pump to run.
I think that check valves need to be installed on systems that have a return line (as opposed to the ones that use the cold water line to recirculate water back to the WH). At least I think I remember reading that somewhere here.
I would also see if there were shut off valves before and after the pump so that replacement or repair can be done without having to first turn off the water to the home and/or drain the lines.
And of course check the wiring for proper protection and installation as well as the plumbing connections.
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