I wish I could put this in “Device Detection” to show you the clean signature, but after two months the water heater has not been detected. The house is not occupied yet so we are in shakedown cruise mode. I was very interested to see the electricity use with and without the recirculator pump going.
With the pump running constantly, the water heater turns on 5 minutes out of every 15. It has a 3800 watt element so this dumb human can easily recognize the signature (ahem). Once I turned the pump off the heater came on for 5 minutes every half hour. Still a lot for a zero water demand situation, IMHO. At $0.10/kwh, it works out to $555/year with NO use…
Rheem advertises in their product brochure that the temperature drops only 5 deg. F in 24 hours when in “standby.” I cut the power and the temperature dropped from 133 to 104 in 24 hours, nearly 30 deg. Hmmmm.
At a minimum I will put some smarts on the recirculator, which my plumber did not feel the need to do.