compact residential unit, hydraulic interface unit for hot water production by continuous flow principle and of heat to radiator heaters via separate heat exchanger. Installation as surface-mounted version with cover. The pipe connection to the residential unit hydraulic interface unit is created using a patented installation system with pre-installation bracket.

Consisting of:

• Copper-soldered asymmetrical stainless steel plate heat exchanger
• Second heat exchanger for system separation on the secondary heating circuit
• HERZ pressure and temperature controller for central regulation of the hot water temperature with a hot water priority circuit
• Fixed value control with setting range 40°C – 70°C consisting of zone valve, thermostat with contact sensor, safety thermostat and circulating pump
• Constant readiness for hot water production even in summer, operating mode due to temperature-regulated bypass switching, permanently set to 45°C
• Cold water meter adapter 110 mm – G 3/4 made of dezincificationresistant brass, also suitable for continuous operation
• Heat meter adapter 110 mm – G 3/4 made of dezincificationresistant brass, also suitable for continuous operation
• Automatic air vent in secondary circuit
• Diaphragm expansion tank secondary
• Diaphragm safety valve 3 bar secondary
• Strainer with fine mesh in primary supply line
• Strainer with fine mesh in secondary return line
• Differential pressure controller (25 - 60 kPa) in the primary circuit
• HERZ drinking water mixing valve
• BESA Tested

Max. operating pressure on primary circuit 16 bar
Max. heating power 15 kW
Tapping rate 20 l/min (10/55°C) – 1 4023 56 or 26 l/min (10/55 °C) – 1 4023 60
Heat exchanger output 63 kW – 1 4023 56 or 82 kW – 1 4023 60
Max. differential pressure 2 bar
Recommended min. differential pressure DP 55 kPa

Accessories to be ordered separately:

- HERZ- pre-installation bracket 1 4023 39
- HERZ flush bypass primary 1 4018 88