The Herz 1853193 is a genuine Herz expansion set designed for single-group underfloor heating systems, connecting directly to a Herz underfloor heating manifold. This comprehensive unit includes a Herz 3-way mixing valve, an actuator, a high-efficiency circulation pump (e.g., WILO Yonos PICO 25/1-6), a precise temperature sensor, and a safety temperature limiter set at 60 °C. It also features essential components like ball valves, a thermometer, vent, drain valve, and a protective insulation shell. Engineered for reliable performance with a maximum operating temperature of 90 °C and a maximum operating pressure of 6 bar. Electrical specifications are 230V, 50Hz. The manifold side connection is G 1 inch, and the primary side connection is G 3/4 inch.