The Watts DP1L-TT-125210 is a 1/2" temperature and pressure (T&P) relief valve for residential water heater service, factory set at 125 psi and 210°F. It features a bronze body. Rated to 150 psi and up to 210°F.
This 1/2 inch temperature and pressure relief valve is used in water heater and hot water storage tank applications to provide automatic temperature and pressure protection to hot water supply tanks and hot water heaters up to 15,000 BTU/hr. It features a bronze body with NPT threaded male inlet and NPT threaded female outlet connections, 2 inch short thermostat with special thermo-bonded coating and test lever. It is CSA listed. Temperature relief at 210 degrees F (99 degree C), pressure relief range is 75 to 150 psi. The standard pressure settings is 125 psi.
Features
- Stainless steel spring
- Solid bronze body construction
- Unique thermostat with special thermo-bonded coating
- ASME rated and CSA listed
Common Questions
- What pressure is this valve set to?
- It is factory set to relieve at 125 psi and 210°F. The setting is fixed and is not field-adjustable. Note the 150 psi figure in the specifications is the maximum of the series' pressure range — the ceiling the body is built for, not this valve's relief point. This valve opens at 125 psi. Match it to the appliance nameplate: the relief setting must not exceed the working pressure stamped on the vessel you are protecting.
- Will it fit my water heater — what BTU input does it cover?
- This valve is rated for 15,000 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.
- What thermostat length do I need?
- This valve has a 2" thermostat probe. The probe must reach into the top 6" of the tank's stored water to sense temperature, so it has to match the depth of your tapping — too short and the valve never sees the overheat it exists to catch. Watts builds this series in several probe lengths; measure before ordering.
- 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: 1/2"
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Inlet Size: 1/2"
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Outlet Size: 1/2"
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Connection: NPT
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Body Material: Bronze
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Max Pressure (psi): 150
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Pack Quantity: 12
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Country of Origin: United States
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Warranty: 1 Year Limited
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MPN: DP1L-TT-125210
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Temperature: up to 210°F
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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): 125
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Temperature Setting (°F): 210
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Discharge Capacity (BTU/hr): 15000
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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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Thermostat / Element Length (in.): 2
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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
