Energy · IECC 2021 §R403.5.3
Drain Water Heat Recovery Unit Piping
Shower drain passing through a heat recovery unit that preheats cold water for the water heater, with the potable-side pressure loss limits: under 3 psi for one or two showers, under 2 psi for three or more.. Referenced to IECC 2021 §R403.5.3.
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