![]() An air gap eliminates the possibility of backflow from the drain into the discharge piping. And, unfortunately, we have an abundance of examples of how not to do it.ġ) The discharge pipe cannot be directly connected to the home’s plumbing drainage system, but an air gap located in the same room as the water heater can used to connect to the drainage system. So, both the International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC P2804.6.1) have the following requirements to make sure that there are no obstructions or the possiblity of injury from the scalding water if the valve opens. Super-hot and high-pressure water gets released to keep the tank from exploding like a bomb. Temperature-Pressure Relief (TPR) valves rarely go off but, if one does, it’s a big deal.
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