Quote:
Originally Posted by villagetinker
As I recall TECO is both a gas and electric company, so is the tankless water heater a gas or electric unit? I am GUESSING that the unit maybe cycling due to an overtemperature condition. Try an internet search on you make and model to see if others have reported the problem and any possible solutions.
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It's gas. I set my shower valve so it draws 3/4 to 1 gpm from the hot water heater (based on the flow meter in the unit). It's minimum flow requirement is 0.4gpm so we draw double that or more. To draw even more, I decreased the output temp on the unit, meaning we have to get more hot water flow to achieve the same temperature in the shower. Amazingly, this caused the problem to occur much more often, which refutes low-flow as a cause! Consequently, I figured it must be related to how the heater cycles on/off during use (to maintain the set output temperature) and must be faulty in not properly cycling back on sometimes. But the company (State) would not authorize the replacement of the motherboard where all the sensors and circuits to do the cycling are located.