Talking about the space heater, not the water heater, I installed a small Rinai direct vent model, about 20,000 btu, about twenty years ago, and it has worked perfectly ever since with no nothing needed. Just turn it on, and it works using 110v, propane, and air to make hot air heat ...... warm, dry, and totally clean to breath... installed in the living room, on the north side, tucked away from the wind.
Have great faith in the Rinai direct vent space heaters, but would not use a non-vented or ventless Rinai space heater, no matter what anybody claims.
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 .... Banned for life from local thrift store!
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