Valve Location:

Valve thermostat sensor rod must be immersed in tank water and located in top 6” of tank to accurately sense temperature.


Discharge Line:

Discharge line must be installed to avoid water damage and scalding injury, when valve operates.
Discharge line must be same size as valve outlet, be pitched down for free draining, and have no shut-off valve or obstructions throughout its entire length. Discharge line termination point should be visible to observe any discharge.

see: [media.wattswater.com]

Quote

25. Should the drain pipe from relief valves be reduced in size
less than drain opening size in valve?

No. The relieving capacity of relief valves is based on a full size
discharge line. Furthermore, there should be no shutoff valves in this
line and it is essential that the drain line be piped to a safe place of
disposal. The drain line must pitch downward. The function of a T&P
valve is to operate by discharging water and, therefore, means must
be provided to eliminate possible scalding and water damage during
periods of relief.

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638



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