Compact substation for drinking water systems and radiator heating utilising a countercurrent heat exchanger made of Cu brazed stainless steel. Central controller for hot water only operates as a pressure drop is detected when a hot tap is opened. Assembly is available in surface-mounting or flush-mounted versions. Pipe connection to an HIU is realised by means of a patented mounting system with pre-mounting unit. This unique installation system saves the installer the often complicated and time-consuming calibration and adjustment measures required on existing (pre-) installations. Ball valves can be connected optionally to the wall or to the floor. Control valves with return flow temperature limiter for lower heating return temperature.

• Constant readiness for hot water even in summer mode by temperature-controlled summer bypass optional
• Differential pressure controller with fixed DP fitted on the heating circuit can be operated as a zone valve with a thermo electric drive for regulating the room temperature.
• Adaptor for cold water meter
• Adaptor for heat meter
• Strainer with fine-mesh screens for heating systems on the supply primary pipe and return secondary pipe.
• Max. operating temperature 90°C
• Max. operating pressure 10 bar
• Min. static cold water pressure 2.8 bar
• Tap output 15 l/min (10/52°C)
• Heat exchanger output 35 kW

The following accessories to be ordered separately:

• HERZ pre-mounting unit 1 4008 53
• HERZ flush-mounted body 1 4008 40
• HERZ cover 1 4008 42