SOURCE: Bosch 125 Tankless Water Heater - Water not hot enough
Sounds more like the venturi in the watervalve of the tankless water heater is clogged. I would recommed rebuilding it and paying close attention to properly relubing the pushrod and cleaning the venturi.
SOURCE: no hot water, pilot light lights but no burner ignition
Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.
SOURCE: The Pilot burner flame is large & yellow
the pilot is getting too much air and is an indicaiot of dirty or air/ fuel ratio imbalance. The pilot is wimpy and the thermocoupler has alot to do with the gas . Make sure your thermocoupler is on the tip of the flame. You may end up replacing it. because it is showing signs of eminnt failure. When it fals your curners won't fire up. Good luck.
SOURCE: Looking for Outdoor Tankless propane water heaters
it will tell you right on the box if it for indoors or out doors either way they have to have a cover over them,,
SOURCE: Bosch tankless GWH 2400 ELP in use 2-1/2 years.
are u using well water or hooked up to city line if well water --may be to cold for unit if water is below a certain temp unit usually goes into error or shuts down if un heated space where water heater is u may have to warm [ insulate ,heat tape etc]the incoming water usually water that around 40 degrees causes problems
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