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 to the floor. Additional second heat exchanger as system distributor with circulating pump. Expansion vessel, safety valve for the protection of the heating circuit. Temperature control by means of a zone valve with electric actuating drive. Control valves with return flow temperature limiter for lower heating return temperature.

• Constant readiness for hot water even in summer mode by an optional temperature-controlled summer bypass
• Adaptor for cold water meter
• Zone valve with thermal actuating drive
• 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 (10/50°C)
• Heat exchanger output 45 kW
• Expansion vessel
• Safety relief valve

The following accessories to be ordered separately:

• HERZ pre-mounting unit 1 4008 04
• HERZ flush-mounted body 1 4008 85
• HERZ cover 1 4008 86