Distribution modules for combined heating systems (high + low temperature) with mixing valve, electronic circulation pumps and open manifold, to manage zoned heating systems requiring large flows of water with consistent feed temperatures or mixed temperatures (high and low temperature for radiator/fan coil systems and radiant panels).
The main feature is the "modular" construction which allows to assemble one or more modules as required.
The mixing system with thermostatic head for fixed-point control (heating only), or with an electric servomotor for temperature control (heating and/or cooling), reacts to any change in flow or heat emission and keeps the temperature of the fluid of the radiant panel system constant.
The unit, which comes with the Wilo Para RS 25/7 electronic circulator, should be completed with the installation of a thermostatic head with a remote sensor (for fixed-point operation in heating mode only), or an electric servomotor (3-point floating, or 0-10 Vdc modulating) combined with a temperature controller for heating and/or cooling.
The open Manifold module (hydraulic separator), allows the modules to be fed with heat sources equipped with a circulator, avoiding any mutual interference between the primary and secondary circuits.

The system is composed of:
- open manifold
- no.1-2 High temperature distribution manifolds
- no.1-2 Low temperature distribution manifolds
- no.1-2 Mixing valves ready for thermostatic head or servomotor
- no.1-2 Calibration and bypass valves
- no.2-3 Wilo PARA 25/7 electronic circulators
- Monitoring thermometers
- no.1-2 Lockshields
- Manual air vent valves
- Fill and drain valve

Technical specifications:
- Distribution manifold head threads: 1”1/4 M - 1” F
- Distribution manifold outlet threads: nut 1” F
- Single zone outlet threads: 1” F
- Distribution manifold maximum temperature: 110 °C
- Maximum pressure: 10 bar
- Circulator connections: pipe union 1”1/2 - spacing 130 mm.

Technical specifications of low temperature mixing unit:
- Max temperature on primary circuit: 90 °C
- Max operating pressure: 10 bar
- Δpmax on primary circuit: 1 bar
- Exchangeable heat output (∆T 7 °C, ∆p effective 0.25 bar)
fixed-point regulation: 10 kW bypass pos.0
fixed-point regulation: 12.5 kW bypass pos. 5
- Mixing valve pressure drops (fixed-point regulation): Kv = 3
- Kv with bypass valve in open position: max 4.9