Choosing the right temperature and pressure relief valve (TPR valve) is essential for protecting water heaters, storage tanks, and related plumbing from dangerous over-temperature and over-pressure conditions. This article highlights five reliable options that align with ANSI Z21.22 standards and common installation needs. Each product features robust materials, precise pressure ratings, and practical fittings for American households and RV applications alike. Below you’ll find a quick product overview, followed by in-depth sections to help you compare design, compatibility, and safety considerations.
| Product | Brand | Key Benefit |
|---|---|---|
| Camco Automatic Temperature and Pressure Relief Valve with Extension Probe and Lever (10473) | Camco | All-brass body, stainless steel spring, 150 PSI/210°F factory setting |
| VAV Temperature Pressure Relief Valve, 3/4″ NPT Female, 150 PSI, 4″ Probe | VAV | Dual protection for temperature and pressure with lead-free copper body |
| Cash Acme NCLX-5L Temperature and Pressure Relief Valve | Cash Acme | Inert coating for mineral deposits, bronze/brass/stainless steel internals |
| Watts 0342691 30 PSI Pressure Relief Valve, Bronze | Watts | Bronze body with standard 3/4″ fittings for general relief |
| FOGATTI 3/4″ NPT Temperature and Pressure Relief Valve, 210°F 150 PSI | FOGATTI | Wide compatibility with common threads and 4″ probe |
Camco Automatic Temperature and Pressure Relief Valve
The Camco relief valve features an all-brass body with a stainless steel pressure spring, combining durability with reliable relief performance. It is designed to guard RV and home water heaters against excess temperature and pressure. The valve uses a ¾-inch NPT connection for straightforward installation and includes a 4-inch temperature probe, plus an extension lever for manual testing. Factory settings are 150 PSI and 210°F, balancing typical domestic water heating system needs with safety margins. Its robust construction helps resist corrosion in common water conditions.
VAV Temperature Pressure Relief Valve
The VAV relief valve combines temperature and pressure protection in a single unit with a ¾-inch NPT female thread and a 4-inch temperature probe. Its lead-free copper body, stainless steel spring, and corrosion-resistant components meet modern safety expectations. Calibrated for 150 PSI, the valve is designed to protect water heaters from dangerous conditions while indicating correct inlet orientation for proper installation. The setup aims to minimize mineral buildup and maintain reliable relief performance in domestic water systems.
Cash Acme NCLX-5L Temperature and Pressure Relief Valve
The Cash Acme NCLX-5L combines a rugged bronze body with brass and stainless steel internal parts, a silicone seat disc, and a stainless steel pressure spring. Its design focuses on corrosion resistance and long-term reliability, with an inert thermal element coating to minimize mineral deposits and galvanic corrosion. The valve family is compact and intended to provide reliable pressure relief alongside integrated protection against mineral buildup that can affect performance over time.
Watts 0342691 Bronze Pressure Relief Valve
The Watts 0342691 offers a bronze body with standard 3/4-inch connections, making it a straightforward option for typical water heater setups. It serves as a reliable, general-purpose relief valve that complies with common safety standards and installation practices. Its simplicity can be advantageous in repair jobs where a replacement valve must fit existing piping without modification or adapters.
FOGATTI 3/4″ NPT Temperature and Pressure Relief Valve
FOGATTI’s valve prioritizes compatibility with common thread sizes, ensuring broad fit across many tank water heaters and mini-tank electric heaters. It features a 3/4″ male NPT inlet and a maximum pressure of 150 PSI with a 210°F maximum relief temperature. The inclusion of a 4-inch probe aids accurate sensing while the brass body provides durability in typical residential water systems and RV applications.
Cash Acme RV FWL-2 Pressure Relief Valve
This Cash Acme model is designed for tankless heaters or units with energy cutoffs, featuring a 3/4-inch MIP inlet and a 3/4-inch FIP outlet. It emphasizes protection for hot water supply systems against over-pressure conditions resulting from thermal expansion. Each valve is subjected to performance testing prior to shipping to ensure consistent relief behavior in field installations.
Buying Guide: Key Considerations for ANSI Z21.22 TP Relief Valves
- Pressure and temperature ratings: Compare set pressure (PSI) and relief temperature (°F) to ensure compatibility with your heater or storage tank’s operating range. Look for valves rated around 150 PSI and 180–210°F as common benchmarks for residential systems.
- Material and corrosion resistance: Bronze, brass, and lead-free copper bodies offer different durability levels. Stainless steel springs and silicone seats improve longevity in mineral-rich waters or high-humidity environments.
- Thread size and connection type: Most residential units use 3/4″ NPT. Verify inlet and outlet threading and whether adapters are needed for RV or tankless setups.
- Probe length and placement: A longer 4″ probe can improve sensing accuracy, while extension probes and test levers support maintenance without disassembly.
- Maintenance and testing: Look for valves with easy test features or levers to simulate relief events for regular safety checks. Consider models that resist mineral buildup with protective coatings.
- Certification and standards: Ensure the valve complies with ANSI Z21.22 or equivalent local standards to guarantee reliably engineered relief performance.
- Installation context: Different models suit residential tank-type heaters, RV water heaters, or commercial storage tanks. Choose a valve designed for your specific application and space constraints.
When evaluating options, consider how the valve’s materials, fittings, and maintenance features align with your system’s water quality and usage patterns. A valve with a robust brass or bronze body, a stainless steel spring, and a longer temperature probe can offer longevity in environments with mineral deposits or fluctuating pressures. For RV or mobile installations, compact designs with straightforward NPT connections and accessible testing levers may simplify routine checks. Finally, verify that the valve’s pressure relief setting aligns with your unit’s maximum operating pressure and the manufacturer’s recommendations.
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