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Give your metal building a tankless water heater

If you were thinking about giving your steel building some hot water, think about considering a tankless water heater.  Just like tank-type heaters, the shorter the hot-water delivery pipe, the less energy is lost to warming up the plumbing. However, if you are willing to throw away the heat energy, and to wait for the hot water to reach the fixture, pipe length doesn't matter. A tankless heater does not need to be installed right at the fixture any more than a storage-type heater. If you are replacing an existing tank-type heater, it is probably most convenient to install the tankless unit in the same space. Your water and gas piping are already in the vicinity and will require only minor plumbing changes. If this is new construction, just pick the most central location. As with all gas appliances, the heater requires venting to the outside. In a retrofit installation the existing flue pipe will probably need to be upsized for the tankless heater. Do not reduce the flue size of the tankless unit to fit a smaller flue already in place. Do not install a tankless heater outside or in an unheated space, unless it never freezes in your climate. The pilot light can be blown out easily if the unit is exposed to the wind.

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 tankless heaters use inexpensive 4-inch single-wall vent pipe, due to their power-vented exhaust. Vent pipe is not included with the 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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