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Radiant Mixing Block

Radiant Mixing Block

The Taco Radiant Mixing Block ® is a breakthrough in the design, control, and installation of radiant systems. The RMB-1 is a complete injection mixing system, combining a variable speed injection mixing control, injection circulator, system circulator and air elimination all in a single unit. You get unmatched versatility and performance as a result.


  • Use as an outdoor reset control, a set-point control or a delta T limiting control.
  • Requires only four pipe connections for complete installation.
  • Does not require special piping, balancing valve, closely spaced tees, external control or complex wiring
Instruction Sheet
Submittal Data
Wiring Guides
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Performance Data

Flow Range: 0-15.5 GPM
Head Range (ft): 0-15′
HP: 1/40, 1/25 
Max. Fluid Temp.: 185°F (85°C)
Min. Fluid Temp.: 32°F (0°C)
Max. Working Pressure: 125 PSI
Connection Size: ¾” NPT

  • All-in-One Heat Exchanger, Dual-Sided Circulators and Mixing Control Package 
  • Use As Outdoor Reset Control, Setpoint Control or Delta-T Limiting Control 
  • Requires Only Four Pipe Connections for Complete Installation 
  • Doesn’t Require Special Piping, Balancing Valve, Closely Spaced Tees, External Control or Complex Wiring 
  • Plug-In, Low Voltage Connections 
  • Solid Stage Microprocessor 
  • Replaceable Cartridge Design 
  • Maintenance-Free, Wet-Rotor Circulators 
  • Stainless Steel Casing for Open/Closed Systems 
  • Auto Pump Exercise 
  • Adjustable Reset Ratio 
  • Warm Weather Shutdown 
  • Boiler Control or Enable Setting 
  • Boiler Protection 
  • Large LCD Display 
  • Outdoor and 2 Strap-On Sensors Included
  • Outdoor Reset Control
  • Setpoint Control
  • Delta-T Limiting Control 
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