HIU flexUFH, compact hydraulic interface unit for hot water production by continuous flow principle and transfer of heat to low-temperature heating. Installation as flush mounted version with flush box or as surface-mounted version with cover. The pipe connection to the hydraulic interface unit is created using a patented installation system with pre-installation bracket. Option to connect the pre-installation bracket from below.

Consisting of:

• Copper-soldered asymmetrical stainless steel plate heat exchanger;
• HERZ pressure and temperature controller for central regulation of the hot water temperature;
• Constant readiness for hot water preparation even in summer operation due to temperature-controlled bypass circuit, fixed at 45 °C;
• Warm and cold water meter adapter piece 80/110/130 mm – G 3/4", also suitable for continuous operation;
• Heat meter adapter 110 mm – G 3/4", also suitable for continuous operation;
• Strainer with fine mesh in the primary supply line and secondary return line;
• Fixed value control with setting range 20 °C – 42 °C;
• Differential pressure controller (20 kPa) in the secondary circuit;
• Differential pressure controller (25–60 kPa) in the primary circuit;
• Connection option for a bathroom radiator via T-pieces
• Empty weight module: 17 kg;
• Connection: MT 3/4" flat sealing;
• Max. operating pressure: 10 bar;
• Max. supply temperature: 85 °C;
• Min. drinking water flow pressure: 2.8 bar;
• Circulation pump space heating: Wilo Para RS 15/6 (SCU) or similar;
• Thermal readjustment;
• Circulation set: 1 4028 57;
• Flush cabinet short: 1 4028 47;
• Front frame with door short: 1 4028 48;
• Flush cabinet long, pre-assembly strip and connection piping for heating circuit distributor: 1 4028 49;
• Front frame with door long: 1 4028 50;
• Cover HIU flexUFH: 1 4028 54;
• Pre-assembly strip HIU flexUFH: 1 4028 55;
• Adapter piece for heat meter sensor M 10 × 1 mm: 1 4022 46.