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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:
- 56
- Outlet Connection Size:
- 1 IN
- Outlet Connection Type:
- Female Threaded
- Outlet Thread Type:
- NPT
- Pressure Range:
- 30 to 75 PSI
- Pressure Relief Setting:
- 75 PSI
- Pressure Steam Discharge Capacity:
- 1,886,000 BTU per hour
- Protection Type:
- Pressure
- Series:
- 740
- Test Lever:
- Yes
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 382456 – Frequently Asked Questions
1) What size pipe does the Watts 740 relief valve 0382456 thread into?
The inlet is 3/4 inch female NPT and the outlet is 1 inch female NPT. That expanded outlet is normal on a boiler relief valve: you pipe the discharge line in 1 inch and never reduce it. So you tap into a 3/4 inch NPT male fitting on the boiler and run 1 inch pipe to within a few inches of the floor.
2) At what pressure does the Watts 0382456 boiler relief valve open?
It is factory set to relieve at 75 psi and is not field adjustable. If your boiler nameplate lists a maximum allowable working pressure below 75 psi, this is the wrong setting for that vessel. Watts builds the 740 series across a 30 to 75 psi range, so match the setting to the boiler rating.
3) Is this valve for a hot water boiler or a potable water heater?
Boiler service. The 0382456 is a pressure-only relief valve for a closed hydronic boiler, with an iron body rated to 250 degrees F. It has no temperature element, so do not use it on a domestic water heater, which needs a combination temperature and pressure (T and P) relief valve with a probe in the tank.
4) Will a 75 psi relief valve handle the output of my boiler?
The rated steam discharge capacity is 1,886,000 BTU per hour. Compare that to the boiler's gross input or output rating on the nameplate: the relief valve capacity has to equal or exceed it. Anything up to roughly 1.8 million BTU/hr is covered by this single 3/4 inch valve.
5) Does the Watts 740 relief valve come with a test lever?
Yes, a manual test lever is included. That matters for MRO and facility crews on a periodic inspection schedule, since the lever lets you lift the disc and verify the valve is free without pulling it off the boiler.
6) What temperature can the Watts 0382456 handle?
250 degrees F maximum on the iron body. Standard closed hydronic loops run well below that, so it suits a typical hot water heating boiler.
How fast can I get the Watts 382456 delivered?
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U.S.
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Watts 382456 come with a warranty?
Absolutely. The Watts 382456 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Watts 382456?
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