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Does anyone monitor collector water flow?
I feel uncomfortable hearing pumps run without knowing they are pumping water. My grundfos supposedly pumps water up to my collector, and an erie motorized check valve is supposed to open and let the solar hot water pass back down to the top of my hwh tank. If the water doesn't flow, the grundfos just swirls the water, and the motor and surrounding pipes get hot. But the water isn't getting hot from the collector. Maybe the mcv isn't opening, or is restricted.
Does anyone use a sight-glass or something to monitor water flow? Is there any way to tell (by listening?) if water is flowing thru a pipe?