Water heater overflow pipe code1/14/2024 The Drip Leg shall be secured in a manner which prevents movement, and the 3/8 inch opening in the Drip Leg shall be directed away from access to the water heater controls. Provide a Drip Leg, as shown in the illustration, when such rise and consequent trapping cannot be avoided. Re-pipe the existing Relief Line, if possible, to prevent any rise above the Relief Valve.ģ. Relocate the water heater so that such trapping is not necessary.Ģ. When replacing a water heater where such a trapped Relief Line was legally installed in the past, it is now necessary to exercise one of three options:ġ. Prior to Plumbing Codes permitted the trapping of Relief Lines. The end of the Discharge Line may not be capped or threaded and must point downward to the ground. The relief valves shall have a cross sectional area at the valve seat that is not less than one pipe size smaller than the cold water supply or the tank drain. Such drains must terminate at the minimum of 1 inch above the rim of the sink, trap or train to prevent back syphonage.Ħ. The Discharge Line may drain to a utility, sink, trap or floor drain. The Discharge Line must terminate at the outside of the building, at a point not higher than 2 inches or less that 6 inches from ground level. The drain shall run continuously downward from the outlet opening of the Pressure Relief Valve.ĥ. The Pressure Relief Valve Drain shall be of galvanized steel, copper pipe, or flexible copper tubing. The Pressure Relief Valve's sensing element shall be immersed in the top 6 inches of the tank.Ĥ. The Pressure Relief Valve shall be installed on the hot water side at the top of the water heater or at the location designated by the manufacturer.ģ. The Relief Valve shall be located in a manner that does not obstruct the valve lever.Ģ. All water heaters shall be provided with an AGA or UL Approved Pressured Relief Valve. Temperature and Pressure Relief Valve Including Discharge Line Requirementsġ. trical circuitry from the disconnecting means to a water heater and electrical connec-tions to the water heater as long as the disconnect is in sight from the unit and the cir-cuit from the disconnecting means to the water heater is no more than fifty (50) feet long.
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