I have one of the Chinese units I bought off ebay. It has battery operated ignition. It is a vent free model.
I bought it for the greenhouse. Most of these will not provide hot water more than 15-20 min at a time then they need a rest and they shut down.
Others have built closed loop heaters and they put them on a timer to rest them then run them again.
If you have any question on it or need pictures I have not installed it yet.
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Current project Aquaponics system , Passive Solar Greenhouse build
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