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Manufacturer Resources
Product Specs
- Application:
- Boiler
- Body Material:
- Iron
- Country Of Origin:
- United States
- Inlet Connection Size:
- 3/4 IN
- Inlet Connection Type:
- Female Threaded
- Inlet Thread Type:
- NPT
- Maximum Temperature:
- 250°F
- Maximum Working Pressure:
- 38
- Outlet Connection Size:
- 1 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Pressure Range:
- 30 to 75 PSI
- Pressure Relief Setting:
- 50 PSI
- Pressure Steam Discharge Capacity:
- 1,352,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 740
- Test Lever:
- Yes
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 382328 – Frequently Asked Questions
1) What size pipe does the Watts 740 relief valve (0382328) connect to?
Inlet is 3/4 inch female NPT and the outlet is expanded to 1 inch female NPT. So you thread it into a 3/4 inch tapping on the boiler and run the discharge line in 1 inch pipe. Don't reduce the discharge below the 1 inch outlet size.
2) At what pressure does the Watts 0382328 boiler relief valve open?
It's factory set to relieve at 50 psi. That's a fixed setting, not field adjustable in the sense of re-ranging on the job, so the boiler you're protecting needs a maximum allowable working pressure at or above 50 psi. The 740 series is offered across a 30 to 75 psi range if 50 isn't your setting.
3) Is the Watts 740 a temperature and pressure (T&P) valve for a water heater?
No. This is a pressure-only relief valve for a hot water boiler, with no temperature probe. If you're protecting a domestic water heater you need a T&P valve with an extension element instead. Use the 740 where the code calls for pressure protection on a boiler.
4) What is the maximum temperature the Watts 740 iron relief valve is rated for?
250 degrees F maximum. That covers normal hydronic hot water boiler service. The body is cast iron, which is why it's suited to closed-loop heating rather than potable water duty.
5) Does the Watts 0382328 have a test lever for annual maintenance?
Yes, it comes with a manual test lever so a maintenance tech can lift and flush the seat during routine service without pulling the valve. That matters for facilities running a scheduled boiler PM.
6) Can I use this iron boiler relief valve on a potable hot water line?
No. It's a cast iron body built for closed hydronic boiler systems, and it protects against pressure only. Potable water service calls for a bronze T&P valve rated for drinking water contact.
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Can I return it if it doesn’t work for me?
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 382328 come with a warranty?
Absolutely. The Watts 382328 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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