We are going on our 3rd tankless hot water heater. The last 2 worked for a short time and then they kept tripping out once the hot water was turned off. This happened consistently about 35 seconds after the hot water was turned off. Once it was reset it was fine for the next use but tripped off immediately after. The manufacturer just sent us another new one saying that the "just got a new batch in from Germany." I want to know if these things are inherently bad and if they're known to have this type of problem. Although the unit is still in warranty we're paying the plumber electrician to keep installing them. Beside it's really inconventient and unsafe to keep resetting this thing! thanks.

Our tankless water heater has no fan. it has elec connections and in /out water.what hose has a pin hole leak? it is like the flow sensor does not communicate with the shut off and the water gets very hot like the heat stays on without flow and of course trips the heater off.we were concerned that after 3 replacements there could be a local answer such as high voltage.the supplier keeps giving us new units but we pay yhe plumber and electrician and it is inconvenient to throw the breakers and open the box to reset overload buttons. Our tankless water heater has no fan. it has elec connections and in /out water.what hose has a pin hole leak? it is like the flow sensor does not communicate with the shut off and the water gets very hot like the heat stays on without flow and of course trips the heater off.we were concerned that after 3 replacements there could be a local answer such as high voltage.the supplier keeps giving us new units but we pay yhe plumber and electrician and it is inconvenient to throw the breakers and open the box to reset overload buttons.