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May I ask you to temper or clarify one adjective? Is this water literally BOILING hot (hotter than the tanks) or only SCALDING hot (as hot as the tanks, about 120*F)? If the tanks are also used for heating, then perhaps 180*F? If the tanks are used both for heating and domestic hot water, then you have several large tempering valves, correct? These ...


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Jimmy's answer covers gas water heaters pretty well. But there are two other points I'd like to address in regards to "what can I do?" Heat Pump Water Heaters are electric water heaters with significantly higher efficiency than normal resistance water heaters, generally rated in the range of 200% to 275% efficiency. Reducing your hot water usage can be ...


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Only "power-vent" type gas water heaters can be vented with plastic pipe. These are gas water heaters with a fan on top which blows the flue gas (and cools it by mixing surrounding cool air with it, hence plastic vent is OK) out of the house. Most can be vented with 3" PVC (white), ABS (black), or CPVC (kinda tan colored). These vents can be run horizontally ...



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