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Manufacturer Resources
Product Specs
- Application:
- Water Heater
- Body Material:
- Lead Free Brass
- Country Of Origin:
- China
- Inlet Connection Size:
- 1/2 IN
- Inlet Connection Type:
- Male Threaded
- Inlet Thread Type:
- NPT
- Maximum Temperature:
- 250°F
- Maximum Working Pressure:
- 15
- Protection Type:
- Pressure
- Series:
- LFN36
- Test Lever:
- No
- Department:
- Plumbing
- Product Group:
- Plumbing
- Product Subgroup:
- Valves
- Product Type:
- Relief Valve
Watts 556030 – Frequently Asked Questions
1) What does a vacuum relief valve like the Watts 0556030 actually do on a water heater?
The Watts LFN36 (model 556030) is a vacuum relief valve for water heater installations. It opens to admit air when a vacuum forms in the tank or supply piping, so the heater does not siphon back or collapse under negative pressure when the cold supply drains down. It is not a T&P valve and it does not relieve excess pressure out of the tank; the listed protection is against vacuum conditions on a water heater system.
2) Can I use the Watts 556030 instead of a temperature and pressure relief valve?
No. This is a vacuum relief valve, rated to a 15 psi maximum working pressure, and it carries no test lever. A water heater still requires its own T&P relief valve sized and rated for the tank. The 556030 is an addition to that, commonly required where the heater can be subjected to a vacuum from a drained cold supply.
3) Is the Watts 556030 vacuum relief valve lead free for potable water?
The body is lead free brass, which is what a potable hot water line calls for on residential and commercial water heater work. Country of origin is China.
4) Does the Watts 0556030 have a test lever?
No test lever on this one. The valve is supplied with a protective cap over the air inlet instead, so there is no manual lift-and-flush check. If your inspector or facility PM program requires a lever for periodic testing, you need a different valve.
5) Where should a 1/2 inch vacuum relief valve be installed on a water heater?
It goes in the cold water inlet piping to the heater, above the top of the tank, mounted upright so the air inlet faces up. The 1/2 inch male NPT end threads into a tee or a tapping at that point. The protective cap keeps debris out of the air port; leave it in place and keep the port clear so air can be drawn in when the line drains.
How fast can I get the Watts 556030 delivered?
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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 556030 come with a warranty?
Absolutely. The Watts 556030 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 556030?
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