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While it does work fine in 'normal' mode, it does not in 'efficiency' mode -- one of the reasons for using such a water heater. I called Rheem and they sent out a replacement circuit board -- but the problem was not solved. The problem is that as the water temperature drops (either due to water usage or just over time), the heater does not start up again until the water temperature drops to 80 degrees. This is regardless of ambient temperatures. Try to wash dishes or take a shower when the water temperature is 82 degrees and you wouldn't be happy with such a heater. The manufacture's tech people tell me that it is working according to specifications. I don't think this is the case. And if that were the case, don't buy a water heater with such ridiculous specifications.