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CHAPTER 2 - HOT WATER PIPING - RESIDENTIALINDIRECT DOMESTIC HOT WATER PIPING1. APPLICATIONA. Tankless Heater: Piping below is essential for safe and .reliable operation.B. Storage Heater: If the storage water temperature is .maintained at or below 120°F, piping below is unnecessary.If there is need to increase the storage, this can be accomplishedby storing hotter water then tempering it. This will necessitate thepiping below.2. PIPING SCHEMATIC(1) Preferably the mixing valve should be set no higher than 120°F.Install mixing valve 15" below H.W. outlet. This will create abeneficial cooling leg.(2) Automatic Flow Regulator (tankless only) must match GPM ratingof the tankless. If piped downstream of mixing valve, GPM flowwill increase if heater water is hotter than 120°F.(3) Placement of hose bibs will permit periodic back flushing ofheater (coil).40
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