Caleffi MixCal™ 521519A 3-Way Adjustable Thermostatic and Pressure Balanced Mixing Valve, 3/4 in, C, 200 psi, 1 gpm, Brass Body

CAL521519A MFG #: 521519A
  • Body Material: Brass
  • End Style: C
  • Flow Capacity: 1 gpm
  • Inlet to Outlet Length: 5 in
  • Manufacturer Name: Caleffi
  • Media: Water/Glycol
  • Nominal Size: 3/4 in
  • Pressure Rating: 200 psi
  • Series: 521
  • Softgoods Material: EPDM Seal
  • Temperature Rating: 85 to 150 deg F
  • Top to Inlet Center: 2-9/16 in
  • Trim Material: Stainless Steel
  • Type: 3-Way Adjustable
The Caleffi MixCal™ 521 series three-way thermostatic mixing valve is used in systems producing domestic hot water or in hydronic and radiant heating systems. It 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 valve has been specifically certified to ASSE 1017 and Low Lead Plumbing Law by IAPMO R&T.
  • Features and More


  • Large mixing chamber and thermostatic cartridge - Enables precise mixed temperature stability during inlet temperature and pressure variations
  • Anti-scale polymer materials - Inhibits scaling on internal sliding surfaces, assuring stable temperature control and long life
  • Tamper-proof adjustment setting lock - Prevents tampering of the mixed water temperature setpoint
  • Peroxide-cured seals - Stands up to treated water, chlorine or chloramines
  • Precisely manufactured - Finely machined threads and double o-rings for smooth knob adjustment
  • Internal anti-scale materials
  • Locking set point knob


  • Domestic Water Systems and Radiant Hydronic Heating Systems


  • Probe and Temperature Gauge


  • ANSI/NSF 372-2011
  • ASSE 1017-2009
  • CSA B125.3-2012
  • FM 21654
  • ISO 9001
  • IPC/IRC/UPC and NPC Compliance
  • Low Lead Certified by ICC-ES File PMG-13
  • ANSI/NSF 372 - 2016 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