HERZ underfloor heating manifold 1" × G3/4", 0–3 l/min, 3 circuits, 1863203

HERZ 1 8632 03 / 1863203 is a high-quality DN25 stainless-steel manifold set for 3 heating circuits, designed primarily for underfloor and other radiant heating systems.

The supply manifold is equipped with adjustable 0–3 l/min flow meters, allowing the required flow rate to be set individually for each of the three heating circuits.

The return manifold incorporates thermostatic valve inserts with M28 × 1.5 threads. Compatible HERZ electrothermal actuators can be fitted for individual room-by-room control.

Both supply and return bars are equipped with air vents and filling/draining valves. The supplied mounting brackets incorporate sound-insulating elements and allow installation on a wall or inside a manifold cabinet.

The main system connection is a G1" female thread, while each heating circuit uses a G3/4" male connection with conical sealing.

The manifold body is manufactured from X5 CrNi 18 10 stainless steel. Valve components are brass according to EN 12164, seals are EPDM and springs are stainless steel.

For versions equipped with flow meters, HERZ specifies a maximum operating pressure of 6 bar and an operating-temperature range of +2 to +70 °C.

Suitable heating medium is heating water complying with ÖNORM H5195 or VDI 2035. Ethylene- or propylene-glycol mixtures of 25–50% by volume may also be used subject to the fluid manufacturer's instructions.

The 3-circuit version has an installation length of 244 mm. The current HERZ dimensional drawing specifies an overall height of 333.6 mm and a 200 mm centre distance between the supply and return bars.

HERZ 1863203 provides accurate hydraulic balancing, robust stainless-steel construction and straightforward automation for a professional three-zone underfloor heating installation.

Key advantages

• For 3 heating circuits.
• DN25 / 1" stainless-steel manifold.
• 0–3 l/min flow meter on each circuit.
• Individual hydraulic balancing.
• M28 × 1.5 thermostatic valve inserts.
• Compatible with HERZ thermal actuators.
• Integrated air vents.
• Integrated filling and draining valves.
• Mounting brackets with sound insulation included.
• G1" main connection.
• G3/4" circuit connections with conical sealing.
• Maximum operating pressure 6 bar.
• Operating temperature +2...+70 °C.

Technical information