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Caleffi 520510AX ¾" MNPT TankMixer™ Mixing Valve with Temperature Gauge

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Original price $318.00
Current price $188.89
SKU 520510AX
Currently 4 in stock.

Caleffi 520510AX ¾" MNPT TankMixer™ Mixing Valve with Temperature Gauge

The Caleffi TankMixer™ 520_AX series kit combines a three-way thermostatic mixing valve with a cold water cross and flexible pipe for easy installation directly on a typical gas-fired water heater and other water heaters that now comply with the National Appliance Energy Conservation Act (NAECA). The TankMixer™ maintains the desired output temperature of the mixed water supplied at a constant set value compensating for both temperature and pressure fluctuations of the incoming hot and cold water. The mixing valve hot inlet port closes tight to prevent temperature creep in recirculation applications. Also available as body only, for a wide variety of separately-sourced end connections, the angle style body design offers improved fluid dynamics for better performance and reduces installation labor and materials, eliminating a piping elbow in typical installations. The valve ICC-ES certified to ASSE 1017 and CSA B125.3. It complies with codes IPC, IRC, NPC and UPC for use in accordance with the US and Canadian plumbing codes, and standard NSF/ANSI 372, low lead.


  • Adjustment temp range:  95° - 150°F
  • Max working pressure (static):  150 psi
  • Max working pressure (dynamic):  75 psi
  • Max inlet temp:  195°F
  • Min flow for optimum performance:  0.5 gpm
  • Gauge scale:  30° - 210°F
  • Gauge accuracy:  ±6°F
  • Gauge dial:  2" diameter
  • Inlet:  ¾" NPT female union connections
  • Outlets:  ¾" MNPT

Compliance with the following codes:  IPC, IRC, UPC and NPC for use in accordance with the U.S. and Canadian plumbing codes

Compliance with the following standards:

  • ASSE 1017
  • CSA B125.3
  • NSF/ANSI 372 - Drinking Water System Components - Lead Content
  • Reduction of Lead in Drinking Water Act - California Health and Safety Code 116875
  • S.3874 - Reduction of Lead in Drinking Water Act
  • Vermont Act 193 - The Lead in Plumbing Supplies Law
  • Maryland's Lead Free Law Hb.372 

Kit Includes:

  • Adjustable three-way thermostatic mixing valve with mixed outlet temperature gauge
  • Angle body with cold water cross with check valve and flexible connector pipe
  • Connections ¾" NPT female to water heater and NPT male union mix outlet/cold water inlet

Technical Brochure

Instruction Sheet