Section 325.01. Plumbing.

 

(1)   General. The design, construction, and installation of plumbing shall comply with the requirements of the Wisconsin Plumbing Code, chs. SPS 382 to 387 , except as provided in this section.

(2)   Tankless water heaters.

(a) The minimum flow rate of a tankless type water heater may be obtained by multiplying 0.65 by the calculated hot water gallons per minute demand, as determined by SPS 382 Tables 382.40–1b and 382.40–3, provided the heater will achieve a water temperature of 110 ° F at the terminal fitting or faucet.

(b) The sizing method in par. (a) may not be used for sizing a water heater serving a high-flow fixture, a hose bibb, a hydrant, or a fixture that is required to have a supply line with a diameter larger than one-half inch.

(c) For the purposes of this subsection, "high-flow fixture" means a fixture with a flow rate of more than 4 gallons per minute, at 80 pounds per square inch, and a water velocity not exceeding 8 feet per second.

(3)   Local waste piping. A trap may be omitted in local waste piping having a length of up to 20 feet.

(4)   Floor drains for garages.

(a) A trap may be omitted for a garage-floor drain that discharges to the ground surface.

(b) The sediment trap for a garage-floor drain shall be removable.

(c) The grate for a garage-floor drain may be nonmetallic if it has a thickness and strength that will withstand the anticipated loads.