I can't help with your issue. But your issue is exactly why I'd never consider a tankless water heater. Until someone figures out how to regulate input water temperature, I think tankless heaters will continue to disappoint.
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2012 Dodge C3500 DRW 4x4 Long Box, WeatherGuard 90 Gal transfer tank, B&W Companion Hitch
2012 Keystone Montana 3100RL, 520W Solar, 460AH batteries, Morningstar MPPT 45 CC, Bogart 2030RV monitor.
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