Watts 0066100 3/4 In Brass Sel...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$90.00
$48.91
Watts 0066100 3/4 In Brass Self Closing Temperature And Pressure Relief Valve, 150 psi, 210 degree F, Test Lever, Extension Thermostat

Watts 0066100 3/4 In Brass Self Closing Temperature And Pressure Relief Valve, 150 psi, 210 degree F, Test Lever, Extension Thermostat

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Model: W66100
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$90.00
$48.91
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3/4 In Brass Self Closing Temperature And Pressure Relief Valve, 150 psi, 210 degree F, Test Lever, Extension Thermostat

0066100 - spec sheet

Manufacturer Resources

Product Specs

Application:
Water Heater
Body Material:
Brass
Country Of Origin:
United States
Inlet Connection Size:
3/4 IN
Inlet Connection Type:
Male Threaded
Inlet Thread Type:
NPT
Maximum Temperature:
210°F
Maximum Working Pressure:
150
Outlet Connection Size:
3/4 IN
Outlet Connection Type:
Female Threaded
Outlet Thread Type:
NPT
Pressure Range:
75 to 150 PSI
Pressure Relief Setting:
150 PSI
Pressure Steam Discharge Capacity:
105,000 BTU per hour
Protection Type:
Temperature And Pressure
Series:
100XL
Shank Length:
1 1/8 IN
Temperature Relief:
210°F
Temperature Steam Discharge Capacity:
105,000 BTU per hour
Test Lever:
Yes
Thermostat Material:
Copper
Thermostat Probe Length:
3 IN
Department:
Plumbing
Product Group:
Plumbing
Product Subgroup:
Valves
Product Type:
Relief Valve

Watts W66100 – Frequently Asked Questions

1) Will the Watts 0066100 T&P relief valve thread into a 3/4 inch water heater tapping?
Yes. The Watts 100XL 0066100 has a 3/4 inch male NPT inlet that screws into the heater tapping, and a 3/4 inch female NPT outlet for the discharge tube. The shank measures 1-1/8 inches, so it suits a standard tapping depth rather than an extended-shank application.
2) What pressure and temperature does this Watts 100XL relief valve open at?
It relieves at 150 psi and at 210 degrees F. That 150 psi is also the maximum working pressure, so the heater and system it sits on must be rated at or above that figure. Do not fit it to a tank with a lower pressure rating.
3) Is a 150 psi T&P valve right for my residential water heater, or do I need a 75 psi one?
The 0066100 is the 150 psi setting within a 100XL pressure range that runs 75 to 150 psi. Match the valve setting to the tank's rated working pressure, not to your incoming water pressure. Most residential tanks are stamped 150 psi, which is what this valve suits; lower-rated tanks need the lower-set version.
4) What BTU rating water heater will this Watts T&P valve handle?
Discharge capacity is 105,000 BTU per hour on both the pressure and temperature sides, so it covers heaters up to that input. A larger commercial heater above 105,000 BTU/hr needs a valve with a higher rated capacity.
5) What does the extension thermostat on this relief valve do, and how far does it reach into the tank?
The copper thermostat probe extends 3 inches past the shank so it sits in the heated water inside the tank rather than in the fitting, which is what lets it sense 210 degrees F and dump. Before you order, confirm you have 3 inches of clear depth at the tapping and nothing obstructing the probe.
6) Does this Watts valve have a test lever for annual maintenance checks?
Yes, it has a manual test lever, which is what a maintenance tech uses to flush the seat and verify the valve is free each year. It is also self closing, so it reseats after the lever is released or after a relief event.
7) Can I use the Watts 0066100 on a boiler or an expansion tank instead of a water heater?
No. The 0066100 is a combination temperature and pressure valve built for water heater service, set at 150 psi and 210 degrees F. Boilers and other vessels take a valve matched to that vessel's rated pressure and function, not this one.
8) Is this a brass-bodied T&P valve, and is it made in the USA?
The body is brass and the valve is made in the United States. Brass body with a copper thermostat is the usual combination on potable hot water service.
How fast can I get the Watts W66100 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 W66100 come with a warranty?
Absolutely. The Watts W66100 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 W66100?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Watts W66100 from ZenSupply?
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