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Bronze temperature and pressure relief valve with 3/4 inch NPT connections, 125 psi setting, 210 degrees F maximum temperature

Apollo

Apollo 18C40229 T&P Relief Valve 3/4 In Outlet 125 psi 210 Degrees F

SKU CH-J3JG-WVBR5 MPN 18C40229

A temperature and pressure relief valve with a 125 psi factory setting and 210 degrees F maximum temperature

  • TypeDrain Components
  • Factory-set 125 psi protects systems from over-pressure
  • Auto re-seating restores seal after discharge without manual reset
  • Bronze body with stainless-steel spring resists corrosion in hot water
  • 105,000 BtuH capacity matches high-output water heaters
  • Certified to ANSI Z21.22, ASME HV and CSA 4.4 standards

What This Valve Does

The Apollo 18C40229 is a temperature and pressure relief valve designed for water-heating equipment. It protects tanks by automatically discharging water when pressure reaches 125 psi or temperature hits 210 degrees F. The bronze body and stainless-steel spring meet ANSI Z21.22 and ASME HV codes for reliable over-pressure protection.

Check Your Installation First

Verify that the system uses 3/4 inch male NPT inlet and 3/4 inch female NPT outlet connections. Confirm the thermostat probe length of 3 inches suits the tank tapping. Ensure the 105,000 BtuH rating matches the heater input and that local codes accept the listed standards before fitting the valve.

Build Quality and Daily Use

The bronze body resists corrosion while the stainless-steel spring maintains consistent set pressure over time. Auto re-seating allows the valve to close again after a relief event without manual intervention. Standard shank length fits common tank openings, and the 1 1/8 inch body width keeps the profile compact for tight mechanical rooms.

Highlights

  • Factory-set 125 psi protects systems from over-pressure
  • Auto re-seating restores seal after discharge without manual reset
  • Bronze body with stainless-steel spring resists corrosion in hot water
  • 105,000 BtuH capacity matches high-output water heaters
  • Certified to ANSI Z21.22, ASME HV and CSA 4.4 standards

Specifications

TypeDrain Components
BrandApollo
Model18C40229

Questions about this item

What comes in the box and what extra parts are needed for installation?

The box contains the valve only; you must supply 3/4 inch NPT pipe or fittings and thread sealant to connect the inlet and outlet.

Which specification should I match when selecting this valve for my water heater?

Choose this model when the system requires a 125 psi factory-set pressure and a 210 °F temperature limit with a 105,000 BtuH rating.

How does the 125 psi setting work once the valve is installed on a hot-water system?

When system pressure reaches 125 psi the bronze body and stainless-steel spring open the valve, then automatically re-seat once pressure drops below that level.

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