Tankless Water Heater Valves
Tankless Water Heater Valve Kits — Red-White Isolation & Drain Valves
Red-White tankless water heater valve kits put full port lead-free brass isolation and drain valves where tankless units need them, with FNPT, sweat, EzPress, and PEX configurations plus complete Super Kits. PVFPro stocks the full line with fast shipping from multiple U.S. warehouses.
What Is a Tankless Water Heater Valve Kit?
A tankless valve kit installs the isolation and drain connections a tankless water heater needs: full port shutoff valves on the hot and cold sides, and a drain/purge point for flushing the heat exchanger. Isolation matters on tankless units because routine service — flushing scale from the exchanger, replacing the unit — requires positive shutoff on both lines. Red-White tankless valves are lead-free brass, full port, with blow-out proof stems, so you get full flow through the valve and years of cycling without stem failure.
Red-White Tankless Valve Families
- 3300 / 3301 / 3302 isolation valve kits — Lead-free brass (ASTM B927 C27450) full port valves with integral drain, for FNPT x sweat and FNPT x FNPT installations. Cold-side variants ship with color-coded handles.
- 3400 / 3410 / 3420 series — FNPT x sweat and FNPT x FNPT kits with integral hose end drain/purge valves for fast flushing connections.
- 3460RAB / 3470RAB PEX kits — PEX F1807 and PEX F1960 x FNPT versions with relief valve capability and union tailpieces for PEX-fed installations.
- 350R2 / 352R2 / 353R2 Super Kits — Complete tankless Super Kits in FNPT x solder, FNPT x FNPT, and FNPT x EzPress configurations.
- 8080FT / 8080MT expansion tank valves — DZR lead-free brass expansion tank valves with EPDM-sealed drain caps for tankless and expansion tank installations.
Applications
- Residential and light commercial tankless water heater installs and service
- Retrofit isolation for existing tankless units that need flushing capability
- PEX-fed tankless installations requiring F1807 or F1960 x FNPT connections
- Expansion tank tie-ins on tankless and standard water heaters
- Press-fit copper installs using EzPress Super Kit configurations
How to Choose a Tankless Valve Kit
- Match the connection to the piping. Sweat (solder) ends for copper, FNPT for threaded pipe, EzPress for press copper, PEX F1807 or F1960 to match your PEX fitting system.
- Hot and cold sides. Order the matched pair; cold-side variants carry a blue handle so the hookup is obvious on the jobsite.
- Plan for flushing. Kits with integral hose-end drain/purge valves make routine heat exchanger flushing a two-minute job instead of a re-piping exercise.
- Check relief requirements. The PEX kits include relief capability; verify local code requirements for T&P and isolation on tankless installs.
Technical Specifications Overview
- Body: Lead-free brass (ASTM B927 C27450) full port valves on 3300/3320/3400/3420/3430 and PEX kits; DZR lead-free brass (ASTM B927 C27453) on 8080 expansion tank valves.
- Operation: Full port flow path, blow-out proof stems, chrome-plated balls with PTFE seats on the ball valve kits.
- Drain/purge: Integral hose-end drain and purge valves on the 3400 series for flush-pump connections; EPDM-sealed drain caps on 8080 expansion tank valves.
- End connections: FNPT x sweat, FNPT x FNPT, EzPress, PEX F1807 x FNPT (3460RAB), and PEX F1960 x FNPT (3470RAB).
- Certifications: AB1953 with NSF/ANSI/CAN 61 and 372 lead-free listings on the AB series.
- Identification: Color-coded hot and cold handles (cold side blue) for fast, correct jobsite installation.
Flushing Workflow With Tankless Valves
The point of an isolation kit with drain/purge ports is the flush cycle. Close both isolation valves, connect a recirculating flush pump to the hose ends, run the descaler through the heat exchanger in a closed loop, then purge and reopen. With Red-White kits the connections are built into the valve bodies, so there is no cutting pipe, no hunting for drain fittings, and no air in the line afterward — the same valves that isolate the unit for service give you the ports to maintain it.
Frequently Asked Questions
- Do I really need isolation valves on a tankless water heater? Yes. Tankless units require periodic flushing, and service calls otherwise mean shutting down the whole system. Isolation valves with drains turn a flush into a quick connect-and-pump job.
- What is a Super Kit? Red-White Super Kits bundle the hot and cold isolation valves with drain and purge capability in a single boxed kit, matched by connection type.
- Are these lead-free certified? The AB series are lead-free brass (ASTM B927 C27450) with NSF/ANSI 61 and 372 certification. Verify listings on the specific product page.
- Can I use these on a standard tank water heater? Isolation and drain valves work for tank units too, though tank installs typically only need the drain side. Boiler drains are also stocked for tank service.
Why Buy from PVFPro
- In stock — fast shipping from multiple U.S. warehouses
- Full Red-White tankless line: threaded, sweat, press, and PEX configurations
- Specs straight from factory documentation on every page
- Bulk pricing available for plumbing contractors doing multi-unit work
