I am a contractor and use residential (electrical) versions similar to this unit on most of my projects. My only complaint is that it can take up to 5 seconds for the unit to boot up, but it shuts off almost immediately as soon as you turn off the water. This leads to cycles of heat, cold, heat and cold, for example when washing dishes. It's just something you have to get used to. However, it beats my old electric/gas appliance by a whopping 10 gallons! A 15-20 minute shower in an RV is definitely a luxury. In addition, a door sold separately must be included and costs too much compared to the cheap price of a heater. Therefore only 4 stars.
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