M-SS25 Stainless Steel Manifold
Legom M-SS25 Stainless Steel Manifold is a precision-engineered distribution manifold for underfloor heating and hydronic HVAC systems, manufactured from 304 stainless steel for outstanding corrosion resistance, high strength, and hygienic, lead-free water contact. It distributes heated water from a single supply into 2 to 12 individually controllable branch circuits, with a protective chromium-rich oxide film on the body for long service life in residential and commercial installations.
With a maximum working pressure of 16 bar, a working temperature up to 110°C, and 3/4″ male Eurocone branch outlets compatible with 20×2.0mm and 16×2.0mm pipe, the M-SS25 connects directly to Legom floor heating pipe and accepts Legom thermal actuators on the branch valves for automatic zone control. The main pipe carries a high maximum flow coefficient of 20 Kv (m³/h) and each branch 1.5 Kv (m³/h), with branches spaced 50mm apart and available in 2 to 12 port configurations.
Key Benefits
- 304 stainless steel body: Built from 304 austenitic stainless steel for outstanding corrosion resistance, high mechanical strength, and dependable performance in pressurized hot water circuits
- Chromium-rich oxide film: The passive chromium-rich oxide layer on the stainless surface is self-repairing, protecting the manifold from corrosion throughout its service life
- Lead-free and hygienic: Stainless steel contains no lead, making the M-SS25 a clean choice for potable water and hygiene-sensitive heating systems
- 2 to 12 branch configurations: Available in eleven sizes from 2 to 12 ports, covering small apartments through to large multi-zone commercial floor heating layouts
- High main pipe flow capacity: A main pipe flow coefficient of 20 Kv (m³/h) supports larger systems and higher branch counts with even water distribution
- 16 bar working pressure: Rated to a maximum working pressure of 16 bar for secure operation in residential and commercial hydronic systems
- 110°C working temperature: Handles working temperatures up to 110°C, suitable for underfloor heating and medium-temperature hydronic distribution
- Eurocone branch outlets: The 3/4″ male Eurocone outlets connect to 20×2.0mm and 16×2.0mm pipe using standard compression unions, simplifying connection to floor heating loops
- Thermal actuator ready: Branch valves accept Legom thermal actuators for automatic per-zone temperature control from a room thermostat or controller
- OEM and ODM customization available: Branch count, connection thread, and finish can be customized for distributor and system integrator requirements
Technical Specifications
| Product Parameter | Specification |
|---|---|
| Main Material | 304 stainless steel |
| Connection Spec. | F1″ * M3/4″ |
| Maximum Working Pressure | 16 bar |
| Working Temperature | 110°C |
| Working Medium | Water |
| Surface Treatment | Chromium-rich oxide film |
| Max. Flow Rate of Main Pipe | 20 Kv (m³/h) |
| Max. Flow Rate of Branch Pipe | 1.5 Kv (m³/h) |
| Branches | 2 to 12 |
| Eurocone | 20*2.0, 16*2.0 |
| Distance Between Branches | 50mm |
Dimensions
| Branches | No. of Branches | L (mm) |
|---|---|---|
| 2 ports | 2 | 126 |
| 3 ports | 3 | 176 |
| 4 ports | 4 | 226 |
| 5 ports | 5 | 276 |
| 6 ports | 6 | 326 |
| 7 ports | 7 | 376 |
| 8 ports | 8 | 426 |
| 9 ports | 9 | 476 |
| 10 ports | 10 | 526 |
| 11 ports | 11 | 576 |
| 12 ports | 12 | 626 |
Application & Use Cases
- Underfloor heating distribution: The primary application. The manifold splits supply and return water into individual floor heating loops, with each branch controlled separately for room-by-room temperature management
- Large multi-zone systems: The 2 to 12 branch range and high 20 Kv main pipe flow make the M-SS25 well suited to large houses and light commercial buildings with many heating zones
- Potable and hygiene-sensitive systems: The lead-free 304 stainless steel body suits domestic hot water and applications where water purity and hygiene are priorities
- Commercial hydronic systems: The corrosion resistance and strength of stainless steel support demanding commercial heating distribution over a long service life
- Heat pump and boiler systems: Connects the heat source to multiple low-temperature floor loops, distributing flow evenly across circuits served by a heat pump or condensing boiler
- Radiant wall and ceiling heating: Distributes water to radiant panel circuits where independent zone control and balanced flow are design requirements
Installation Notes
- Mount the manifold horizontally on a wall bracket or inside a manifold cabinet positioned above the floor loops, leaving clearance for actuators and pipe connections
- Connect the supply and return lines to the 1″ female main connections on each end of the manifold body
- Connect each floor heating loop to the 3/4″ male Eurocone branch outlets using compression unions sized for 20×2.0mm or 16×2.0mm pipe
- Fit Legom thermal actuators to the branch valve heads for automatic zone control driven by a room thermostat or controller
- Flush the system thoroughly before commissioning to remove installation debris that could obstruct flow or damage valves
- Conduct a pressure test at a minimum of 1.5 times the intended working pressure before screed or concrete is poured, and confirm all connections are leak-free
- Balance the loops and label each branch at the manifold to simplify commissioning and future maintenance
- Maintain the 50mm branch spacing clearance so each thermal actuator can be installed and removed without obstruction
Frequently Asked Questions
What is 304 stainless steel and why is it used for the manifold body?
304 is an austenitic stainless steel widely used in plumbing and heating because it combines high strength with outstanding corrosion resistance and a hygienic, lead-free surface. For a manifold that carries pressurized hot water continuously, these properties give a long service life with minimal risk of corrosion or contamination. The body is finished with a protective chromium-rich oxide film.
What is the chromium-rich oxide film?
Stainless steel naturally forms a thin, passive chromium-rich oxide layer on its surface when exposed to oxygen. This film is what makes stainless steel corrosion resistant, and it is self-repairing: if the surface is scratched, the exposed chromium reacts with oxygen and reforms the protective layer. On the M-SS25 this passive film protects the manifold against corrosion throughout its working life.
Should I choose a stainless steel or a brass manifold?
Both perform well for underfloor heating. Stainless steel is lead-free, offers excellent corrosion resistance through its passive chromium oxide film, and the M-SS25 provides a higher main pipe flow (20 Kv) and a wider branch range (2 to 12 ports), making it a strong choice for larger or hygiene-sensitive systems. Brass manifolds such as the M-B25 and the nickel-plated M-BN25 remain a cost-effective and proven option for standard residential systems.
What does the connection spec F1″ * M3/4″ mean?
The main supply and return connections at each end of the manifold are 1″ female (F1″), and the branch outlets that feed each floor loop are 3/4″ male (M3/4″). The 3/4″ branch outlets use the Eurocone standard, so they connect to floor heating pipe through standard 3/4″ compression unions.
How many branches are available and what are the lengths?
The M-SS25 is available in eleven branch configurations from 2 to 12 ports. The body length grows by 50mm per branch, from 126mm for 2 ports up to 626mm for 12 ports. Select the branch count to match the number of heating zones in your project.
What is a Eurocone connection and which pipe sizes fit?
Eurocone is a common 3/4″ union standard used to connect floor heating pipe to a manifold branch outlet. The M-SS25 supports Eurocone connections for 20×2.0mm and 16×2.0mm pipe, where the figures are the pipe outer diameter and wall thickness. This makes it compatible with standard Legom floor heating pipe in those sizes.
Can I fit thermal actuators to this manifold?
Yes. The branch valve heads accept Legom thermal actuators, which open and close each loop in response to a room thermostat or controller for automatic zone control. Maintain the 50mm branch spacing clearance so each actuator can be installed and serviced without obstruction.
What is the maximum working pressure and temperature?
The M-SS25 is rated for a maximum working pressure of 16 bar and a working temperature up to 110°C, with water as the working medium. This covers standard underfloor heating and medium-temperature hydronic distribution in residential and commercial systems.
Can the M-SS25 manifold be customized for OEM or private-label supply?
Yes. Legom supports full OEM and ODM services for the M-SS25 Stainless Steel Manifold, including customization of branch count, connection thread, and finish. All customization projects are handled under strict confidentiality. Contact our team to discuss your requirements.
OEM & ODM Customization
Legom is a direct manufacturer offering full OEM and ODM services for the M-SS25 Stainless Steel Manifold. Our manufacturing team can customize branch count, connection threads, surface finish, and packaging to match your product and brand requirements. All customization projects are handled with strict confidentiality. Contact us via WhatsApp or info@legomsmart.com.
Product information last reviewed by the Legom Technical Team. For the most current specifications, refer to the official datasheet or contact our sales team.
Custom OEM & ODM Solutions
Legom is a direct manufacturer offering end-to-end OEM and ODM services. With our in-house engineering and production capabilities, we work closely with distributors and system integrators to deliver fully customized solutions under strict NDA.
