Stainless steel 4 way manifold for underfloor heating

Product detailed description

Four-way manifolds are essential components in underfloor heating systems, particularly in residential and commercial buildings where precise zoning is required. These devices enable independent control of multiple heating circuits, ensuring balanced heat distribution. Installers working with radiant floor systems commonly encounter such manifolds during new builds, renovations or system upgrades. They are typically found in bathrooms, living rooms, offices or large open-plan spaces where thermal comfort is critical.

The AVANSA HR1103-4 is designed for use with both heating and cooling applications, making it suitable for systems requiring seasonal reversal or dual-purpose use. Its construction allows integration with various pipe types, including multi-layer plastic and copper. The inclusion of flow meters and thermostatic valves ensures accurate regulation of flow rates and temperature per circuit. This makes the manifold ideal for systems where energy efficiency and occupant comfort are priorities.

Technical parameters

Valve body	Pressed brass Ms 58, nickel-plated
Length without globe valves	295mm
Length with globe valves	345mm
Fluids	Heating water, cooling water, water mixtures with standard anti-corrosion non-freezing additives
Material	Brass, heat-resistant plastics, stainless steel 1.4301
Maximum working pressure	4 - 6 bar
Maximum allowable operating temperature	+80°C
Maximum allowable operating pressure	6 bar
Maximum test pressure	10 bar
Recommended pipe	PEX-AL-PEX 16 x 2
Recommended connection	Push-fit compression fitting on ALPEX 16 x 2 ALU-EK pipe
Recommended junction boxes	Junction boxes for manifolds
Flat gasket	WS 3825
Number of circuits	Four
Measurement accuracy	+/- 10%
Flow rate	1.12 m³/h
Flow meters	Dual-regulation with locking capability
Branch connections	Eurocone
Inlet and outlet connection	1"
Allowable fluid temperatures	-10°C to 120°C
Measurement range	0–5 L/min
Sealing	EPDM
Application	Heating and cooling systems
Thread	DIN ISO EN 228-1
Sound insulation	DIN 4109
Country of origin	Germany
EAN	5999093608925
Code	HR1103-4
Brand	AVANSA

The technical parameters of the AVANSA HR1103-4 define its operational range and compatibility with different systems. For example, the maximum allowable operating pressure of 6 bar indicates the manifold’s suitability for low-pressure systems typical in radiant floor heating. The temperature range of -10°C to 120°C allows it to function in both heating and cooling environments. The recommended pipe size (PEX-AL-PEX 16 x 2 mm) helps ensure proper flow and minimises pressure drop when designing a system layout.Installation and connection The AVANSA HR1103-4 is installed using standard piping methods. The inlet and outlet connections are 1 inch internal thread (DIN ISO EN 228-1), while branch connections use Eurocone fittings. Prior to installation, the manifold should be positioned in an accessible location near the floor slab or within a dedicated junction box. Each branch is connected using push-fit compression fittings suitable for ALPEX 16 x 2 mm tubing. To avoid leaks and flow imbalances, all connections must be tightened according to the manufacturer’s torque specifications. A key step is the alignment of the flow meters and thermostatic valves, which should be oriented vertically for consistent readings. During commissioning, each circuit should be checked for air pockets using the built-in automatic bleed valves. Common installation errors include incorrect orientation of the flow meters and failure to bleed the system after filling, which can lead to inaccurate readings and uneven heat distribution.

Compatibility and accessories

The manifold is compatible with most underfloor heating systems using PEX-AL-PEX 16 mm pipes. It requires the use of dedicated junction boxes to protect the manifold and provide secure mounting. While no specific accessories are listed, the use of insulation around the manifold can help reduce noise transmission and improve thermal efficiency. The manufacturer recommends pairing the manifold with compatible thermostats and control systems for fully automated regulation of individual zones.

Technical background for designers

The AVANSA HR1103-4 operates by dividing the primary flow from the central heating unit into four separate circuits. Each circuit is equipped with a thermostatic valve and a flow meter, allowing for precise adjustment of water flow and temperature. The use of stainless steel and brass ensures long-term durability, especially in environments with chemically treated water. The EPDM sealing material resists degradation from antifreeze mixtures and hot water. The design incorporates sound insulation features compliant with DIN 4109 standards, reducing noise from water flow through the manifold. The combination of pressure ratings (up to 6 bar) and temperature tolerance (-10°C to 120°C) makes it adaptable to a wide range of system designs. For optimal performance, the manifold should be placed in a location with minimal thermal interference and good access for maintenance.

Service and operation

Routine maintenance involves checking for leaks, verifying the operation of the thermostatic valves and ensuring that the flow meters remain unobstructed. The automatic bleed valves should be inspected periodically to confirm their functionality. No scheduled service intervals are specified in the technical documentation, but any visible signs of corrosion or blockage should prompt immediate inspection. During system shutdown, the manifold can be drained using the integrated drain cocks, which also serve as emergency shut-off points.

Frequently asked questions

Can the AVANSA HR1103-4 be used with non-standard pipe diameters?
No, the manifold is specifically designed for PEX-AL-PEX 16 x 2 mm pipe. Using other diameters may affect flow balance and pressure drop.

Are the flow meters adjustable for different flow rates?
Yes, the flow meters have a measurement range of 0–5 L/min and allow for fine-tuning of each circuit’s flow rate.

Can the thermostatic valves be locked in position?
Yes, each thermostatic valve includes a locking mechanism to prevent tampering and maintain set temperatures.

Is the manifold compatible with glycol-based fluids?
Yes, the materials used in the manifold are resistant to standard antifreeze mixtures containing glycol, provided the concentration remains within acceptable limits.