Here’s a few basic things to consider about this particular tankless water heater.
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It’s NOT going to replace a typical tank water heater for your whole house. This is for a single area only such as a bathroom or kitchen.
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Unlike what is claimed in the description it is NOT for an RV or camper, because it runs on 220v and RV’s only use 110v (unless you are running a larger generator of more than 6.5kW - preferably MUCH more).
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The plumbing hook-up may be pretty easy, but the electrical will get pricey. Running a dedicated 220v line properly won’t be cheap - plus you have to have room in your breaker box for an additional 30-amp 2-pole breaker (if you don’t have the room, it will get REALLY pricey at that point).
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I would only consider this unit if it were replacing an existing tankless water heater where everything was already run, or for new construction/significant remodel where you have one place you need hot water but it is pretty far away from the main tank such as a detached garage apartment or a new bathroom on an upper floor far away from your water heater in the basement. If that were the case you would only need to run a single cold-water supply instead of both cold and hot water lines.
Hope this helps.