They are standard equipment in some RVs.
We have one, and its fine, once you get over the learning curve.
Its gas only, electric ones draw 60 to 90 amps, and only fires up when water is flowing.
We have found that if we the digital control to shower temps and only use the hot faucet, it works good. Trying to mix hot and cold can upset the water flow thru the heater and shut down the burner, blasting you with cold water. Of course that depends on your pump pressure or the CGs pressure when hooked to city water.
If I had a choice, a tank type would be what I'd pick. In my case, it may not fit.
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