![]() If the total developed length of the T&P discharge line exceeds 40 feet, the line size must be increased by one nominal trade size.Īll horizontal runs of the discharge line must be pitched at 1/4" per foot towards the discharge end. The T&P discharge line diameter must be equal to or greater than the diameter of the discharge port. The T&P valve may be discharged into the house DWV system providing it is connected by means of an approved "indirect waste receptor" such as a utility sink or floor drain providing the lowest point of the discharge line must remain a minimum of 4 times the discharge line diameter or 2", whichever is greater, above the flood level rim of the receptor.Ī T&P discharge line SHALL NOT discharge into a water heater drip pan. A Pressure Relief valve is then installed on a hot water line at any convenient point above grade and a discharge line extended outdoors or to an approved indirect waste receptor. ![]() ![]() When a gas water heater is installed in a basement where a T&P gravity flow drain line cannot be achieved the standard Temperature & Pressure Relief Valve (T&P) valve is to be removed and a WATTS 210 gas shutoff valve installed on the water heater vessel. When discharging on a floor the T&P line must extend from the output port of the valve to within 6" of the floor surface and the end of the line must direct the flow downward. In a garage or unfinished basement the T&P line may discharge on the floor providing the said floor is equipped with a floor drain. Under the Uniform Plumbing Code the point of discharge must be greater than 6" but not more than 24" above average terrain. Under the International Residential Code the point of discharge must be within 6" of the average terrain ground level. When discharging outdoors the discharge end of the pipe MUST BE pointed downward. When discharging outside the structure the point of discharge must be at a clearly visible location and may not be obstructed by shrubbery or landscaping materials. The preferred method is to run the line through the wall and discharge outside the structure.
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