Tankless Water Heater Valve Kits | Pressure Relief Valves

Gas tankless water heaters require regular maintenance to ensure optimal performance and long service life. Isolation valves—also known as service valves, maintenance valves, or flush kits—are mechanical devices designed to isolate tankless water heaters from the surrounding plumbing system for cleaning and maintenance. Relief valves also play an important role in tankless water heater maintenance by preventing pressure build-up that could lead to premature failure.

Tankless Water Heater Maintenance Valve Kits

At RED-WHITE VALVE CORP., we supply several valve solutions to simplify maintenance and optimize the performance of gas tankless water heaters. Our maintenance valve kits allow water heaters to be internally maintained without requiring a full-system shutdown, while integral relief valves ensure the safe release of excess system pressure. By supporting maintenance tasks and alleviating pressure-related stress, these valve kits keep gas tankless water heaters running smoothly and safely.

Our lead-free (LF) maintenance valve kits for tankless water heaters include:

• 350R/352R Tankless Contractor Kit with Gas Accessories: CSA-certified for indoor and outdoor use, our 350R/352R kit includes 3400RAB or 3420RAB configurations, a gas valve, and a polymer-coated flexible gas connector.
• 3300AB LF Brass Solder Water Heater Isolation Valve Kit: Our 3300AB LF kit features 3301AB or 3302AB configurations with adjustable packing and blow-out proof stems.
• 3320AB LF Brass Solder Water Heater Isolation Valve Kit: The 3320AB LF kit includes 3321AB or 3322AB configurations, blow-out proof stems, and virgin PTFE seats.
• 3330AB LF Brass Solder Water Heater Isolation Valve Kit: Our 3330AB LF kit includes 3331AB or 3332AB configurations with blow-out proof stems and EzPress x EzPress connections.
• 3400AB LF Tankless Water Heater Valve Kit: Our 3400AB LF kit includes 3401AB or 3402AB valve configurations, integral base drains, integral relief valves, and capped purge ports. Integral relief valve port configurations include:
  • 3400RAB: 200K BTU/hr relief
  • 3400SAB: 500K BTU/hr relief
  • 3400TAB: 2.7M BTU/hr relief
• 3400LAB LF Solder Tankless Water Heater Valve Kit: Our 3400LAB LF kit includes 3401LAB or 3402AB valve configurations, integral base drains, integral relief valves, and capped purge ports. Integral relief valve port configurations include:
  • 3400LRAB: 200K BTU/hr relief
  • 3400LSAB: 500K BTU/hr relief
  • 3400LTAB: 2.7M BTU/hr relief
• 3420LAB LF Threaded Tankless Water Heater Valve Kit: Features of our 3420LAB LF kit include 3421LAB or 3422AB configurations, an integral hose-end drain/purge valve, and the following integral relief valve port configurations:
  • 3420LRAB: 200K BTU/hr relief
  • 3420LSAB: 500K BTU/hr relief
  • 3420LTAB: 2.7M BTU/hr relief
• 3420RAB/TAB LF Tankless Water Heater Valve Kit: Our 3420RAB/TAB LF kit includes 3421AB or 3422AB configurations, integral base drains, capped purge ports, and the following integral relief valve configurations:
  • RAB: 200K BTU/hr relief
  • TAB: 2.7M BTU/hr relief
• 3430LAB LF EzPress Tankless Water Heater Valve Kit: The 3430LAB LF kit features valves with FNPT x EzPress connections, integral base drains, capped purge ports, and the following integral relief valve configurations:
  • RAB: 200K BTU/hr relief
  • SAB: 500K BTU/hr relief
  • TAB: 2.7M BTU/hr relief
• 3430RAB LF EzPress Tankless Water Heater Valve Kit: Our 3430RAB LF kit comes with 3431AB or 3432AB valve configurations with FNPT x EzPress connections and integral hose-end drain/purge valves. Integral relief valve port configurations include:
  • 3430RAB: 200K BTU/hr relief
  • 3430SAB: 500K BTU/hr relief
  • 3430TAB: 2.7M BTU/hr relief
• 3450RAB LF EzGRIP Tankless Water Heater Valve Kit: The 3450RAB LF kit includes 3451AB or 3452AB valve configurations with FNPT x EzGRIP connections, an integral hose-end drain/purge valve, and the following integral relief valve configurations:
  • 3450RAB: 200K BTU/hr relief
  • 3450SAB: 500K BTU/hr relief
  • 3450TAB: 2.7M BTU/hr relief

Tankless Water Heater Pressure Relief Valve Kits

Well-designed isolation and pressure relief valve kits preserve the efficiency and longevity of gas tankless water heaters by supporting routine maintenance activities and relieving internal pressures. At RED-WHITE VALVE CORP., our wide selection of industry-compliant maintenance valve kits allows us to find effective and affordable valve solutions for even the most challenging tankless water heater designs.

To learn more about our tankless water heater isolation valve kits, please contact us today or request a quote.