The Taco XPB-1 X-Pump Block Mixing System is a compact, all-in-one unit designed to integrate heat generation and heat delivery systems in hydronic applications. By combining key components like a variable speed mixing control, heat source circulator, system circulator, and a brazed plate heat exchanger, it isolates the boiler or water heater from the heating distribution system (radiant tubing, snowmelt, or baseboard heating). This design simplifies installation with just four pipe connections required.

Key features include:

• Multiple operation modes: outdoor reset, setpoint, and delta T control
• Solid-state microprocessor with large LCD display
• Maintenance-free wet-rotor circulators with replaceable cartridges
• Bronze housing suitable for open and closed systems
• Automatic pump exercise and warm weather shutdown
• Adjustable reset ratio for optimized performance
• Includes outdoor sensor and two strap-on sensors
• Plug-in low voltage connections and line cord (hardwire optional)
• Flow range: 0–7.5 GPM; Head range: 0–15.5 feet; Max pressure: 125 psi

Replacement parts such as the 193-025RP System Pump Kit, 193-024RP Heat Source Pump Kit, and 008-045RP Bronze Cartridge Assembly are available to maintain or upgrade system performance.