The Watts 100XL-150 3/4 is a 3/4" temperature and pressure (T&P) relief valve for residential water heater service, factory set at 150 psi. It features a brass body. Rated to 150 psi.
This 3/4 inch temperature and pressure relief valve is used to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU/hr. It features a brass body with NPT male inlet and NPT female outlet connections, unique thermostat with special thermo-bonded coating, and a test lever. This valve is ASME rated and CSA listed. Temperature relief is 210 degree F (99 degree C). Pressure relief is set at 150 psi.
Features
- Required safety device on all water heaters
- Prevents water heater from blowing up
- Brass body construction
- Temperature relief is 210 degree F (99 degree C)
- Used to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 105,000 BTU/hr
- ASME rated, CSA Listed
- Features unique thermostat with special thermo-bonded coating
- Includes test lever and stainless steel spring
- ANSI Z21.22 certified
Common Questions
- What pressure is this valve set to?
- It is factory set to relieve at 150 psi. The setting is fixed and is not field-adjustable.
- Will it fit my water heater — what BTU input does it cover?
- This valve is rated for 105,000 BTU/hr on the CSA temperature-steam basis. Code requires the relief valve's discharge capacity to equal or exceed the input of the appliance it protects, so the number on your heater or boiler nameplate must be at or below that figure. Compare it against the input rating on the water heater's data plate.
- Is this ASME rated?
- Yes. It is ASME rated and carries the "HV" code symbol under ASME BPVC Section XIII (the section that replaced Section IV for overpressure protection), and it is National Board (NBBI) certified. It is also ANSI Z21.22 / CSA 4.4 approved, which is the listing water heater relief valves are required to carry. Inspectors look for that stamp on the valve body, and it is there.
- Can I use this on potable water?
- No. This model is not certified lead-free, so it cannot be installed in a potable (drinking) water line under the NSF/ANSI 372 weighted-average lead rule. Use it on non-potable service, or order the "LF" version of this model for potable water.
- Does the discharge have to be piped?
- Yes. Codes require the outlet to be piped full-size to a safe point of discharge, terminating with an air gap and no valve, cap, or reducer anywhere in the line — a relief valve that cannot discharge freely is not protecting anything. The manual test lever should be operated at least annually to confirm the valve is not seized.
Specifications
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Type: Relief
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Size: 3/4"
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Inlet Size: 3/4"
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Outlet Size: 3/4"
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Connection: NPT
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Body Material: Brass
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Max Pressure (psi): 150
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Pack Quantity: 50
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: 100XL-150 3/4
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Certifications: ASME Section XIII (HV), NBBI, ANSI Z21.22, CSA 4.4
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Lead-Free: No
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Relief Type: Temperature & Pressure
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Factory Set Pressure (psi): 150
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Discharge Capacity (BTU/hr): 105000
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BTU Rating Basis: CSA Temperature Steam
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ASME Code Rating: ASME Section XIII (HV)
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Application: Residential Water Heater
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Shank Length: Standard
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Connection Configuration: MNPT inlet x FNPT outlet
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Automatic Reseating: No
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Manual Test Lever: Yes
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Approved for Potable Water: No
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SentryPlus Alert Flood Sensor: No
