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Old 03-19-2018, 09:37 AM   #1
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Tankless water heater

Just returned from maiden trip in our 2011Wildcat 5th wheel 302RLS. I have a question about my tankless water heater. First, after de-winterizing and sanitizing the fresh water tank, i filled it back up. I then went out and flipped switch on outside inside water heater panel. Is there anything else i needed to do before getting hot water? I ask because when turned on hot water. The water heater started making a loud noise when it kicked on. Is it normal to be so loud? I immediately cut it off because wasn't sure i had done everything correctly.

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Old 03-20-2018, 09:24 AM   #2
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Did you ensure that after de-winterizing that you had water flow?

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Old 03-20-2018, 11:24 AM   #3
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Most tankless water heaters are louder than you expect if you never used one. So making noise is good thing.

In ours the noise is somewhere between the sound of the water pump and the propane heater burner (before the fan comes on).

If water is not flowing, or the burner does not ignite (no propane), the unit will not function. So sounds like you have the bypass valves set correctly and water is going through the on demand.
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