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Water heater vents should be run to the outside of
your home All models come with draft diverter installed. Aquastar tankless heaters use conventional double-wall Type B vent pipe. This is the same type of vent used with conventional water and space heaters. Tagaki tank less heaters use inexpensive 4-inch single-wall vent pipe, due to their power-vented exhaust. Vent pipe is not included with the water heater, but is easily available at plumbing, building supply, or hardware stores. The vent piping used with most of these heaters is larger than tank-type vent piping. Do not adapt down to an existing vent size! Replace the vent and cut larger clearance holes as necessary if doing a retrofit. Venting may be run horizontally as much
as 10 feet. Maintain 1-inch rise per foot of run. Aquastar recommends
ten feet of vertical vent at some point in the system to promote good
flow.
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