Quote:
Originally Posted by dougawhite
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.
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My tankless unit (electric) also has a *maximum* flow rate which, if reached, errors out and everything goes cold. I don't know if that is what is happening to you or not - don't know if gas units act the same way. My unit has worked great otherwise for the last 5 years. I just can't open the tub valve (the largest flow in the house) full blast. But I also didn't order the biggest unit. Mine was a 15kW.