Reliance 100108456 Water Heater Temperature & Pressure Valve — 2in Long Shank, 3/4in Male NPT

Reliance Temperature & Pressure Valve for Water Heaters

The Reliance 100108456 Temperature & Pressure Valve is designed to help manage heat and pressure within standard residential water heaters. Rather than relying on guesswork, this safety component provides a dedicated venting path when the system experiences higher temperatures or increased pressure. Think of it as a proactive safeguard that supports steady performance and reduces stress on the appliance during busy mornings or high-demand periods.

Key design details include a 3/4" male NPT inlet paired with a female outlet, and a 2" long shank. The longer shank offers a secure connection and straightforward alignment with typical heater fittings, which can simplify installation and help maintain a reliable seal over time.

What it offers

• Direct-fit installation on most standard water heaters
• 2" long shank for a robust, aligned connection
• 3/4" male NPT inlet/outlet for compatibility with common plumbing layouts
• Protection against overheating and over-pressurization to support safe operation

Practical use and benefits

In everyday use, you may notice more consistent water temperatures as the system responds to fluctuations in demand. While outcomes vary by setup, the valve provides a practical option for maintaining the heater’s safe operating range and potentially reducing nuisance safety trips.

Because it is designed to fit directly onto the heater, this valve can reduce the need for additional adapters and fittings, helping to streamline replacement or upgrade projects. The combination of a direct connection and a sturdy shank can contribute to a cleaner installation and durable performance in busy households.

Installation and compatibility tips

• Ensure your water heater uses a 3/4" male NPT inlet for a proper match
• Install per local codes and the water heater manufacturer’s guidance for safe operation