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Heat Traps

Larry Spielvogel
Larry Spielvogel Member Posts: 1
in THE MAIN WALL
In ASHRAE Standard 90 there is a requirement for heat traps on both residential and commercial water heaters, but no specifics about what type or size. Are you aware of any text or reference that describes quantitatively how a heat trap should be configured and built, with dimensions, for various pipe sizes and hot water temperatures? The provisions are:
"7.2.6 Heat Traps. Vertical pipe risers serving storage water heaters and storage tanks not having integral heat traps and serving a nonrecirculating system shall have heat traps on both the inlet and outlet piping as close as practical to the storage tank. A heat trap is a means to counteract the natural convection of heated water in a vertical pipe run. The means is either a device specifically designed for the purpose or an arrangement of tubing that forms a loop of 360 degrees or piping that from the point of connection to the water heater (inlet or outlet) includes a length of piping directed downward before connection to the vertical piping of the supply water or hot water distribution system, as applicable."

Comments

  • Earthfire
    Earthfire Member Posts: 543
    heat traps

    All connections to the water heater & the trap itself should be copper not cpvc or pex. We usually connect to the waterheater with a 24in. riser, 90 over to a 2-3in. stub, 90 down to a 18in. nipple, 90 over to another short stub, 90 again straight up and connect to the respective hot & cold lines.
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