910018CC Solar Water Heater Thermostatic Mixing Valve
The Legom 910018CC Thermostatic Mixing Valve is a multi-size thermostatic mixing valve available in DN15, DN20, DN25, and DN40, certified to EN1111, EN1999, and QB2606-2006 — covering European sanitary and solar thermal standards alongside the Chinese national thermostatic mixing valve standard. The valve delivers a controlled outlet temperature across a 30–65°C adjustment range at ±2.0°C accuracy, with a maximum working temperature of 95°C making it suitable for direct installation on high-temperature solar thermal storage systems as well as conventional hot water supply circuits.
The valve body is manufactured from nickel-plated brass with a copper valve core, retardant ABS handle, and SUS304 stainless steel spring. A single-piece thermostatic cartridge with integral check valves and strainers on both inlets provides automatic shutoff on hot or cold water supply failure, and the high-flow, low-pressure-drop hydraulic design scales across all four pipe sizes. The 910018CC is factory preset at 40°C for DN15 and DN20 and at 50°C for DN25 and DN40, with field adjustment available across the full 30–65°C range.
Key Benefits
- EN1111, EN1999, and QB2606-2006 triple certification – EN1111 covers thermostatic mixing valves for sanitary use at mains pressure; EN1999 addresses valves for solar and storage water heating applications; QB2606-2006 is the Chinese national standard for thermostatic mixing valves. Triple certification confirms the 910018CC meets the regulatory requirements for both European export markets and the domestic Chinese market within a single product platform
- Four pipe sizes in a single product series — DN15 to DN40 – The 910018CC is available in DN15 (G1/2), DN20 (G3/4), DN25 (G1), and DN40 (G1-1/2), covering individual fixture supply connections at the small end and central mixing stations for multi-fixture or commercial distribution circuits at the large end. All four sizes share the same thermostatic cartridge specification and certifications, simplifying specification across a complete building hot water system
- 95°C maximum working temperature for solar thermal compatibility – The 95°C maximum working temperature accommodates the high-output conditions of evacuated tube solar collectors and pressurized flat-plate systems at peak irradiance. This makes the 910018CC directly suitable for installation at solar storage tank outlets without requiring a separate upstream temperature limiting device under normal solar operating conditions
- Single-piece thermostatic cartridge for simplified servicing – The self-contained single-unit cartridge can be removed and replaced as a complete assembly without dismantling the valve body or disturbing the installed pipework connections. This reduces service time and eliminates the risk of incorrect reassembly of individual internal components during maintenance
- Automatic shutoff on hot or cold water supply failure – If either the hot or cold water supply fails during operation, the thermostatic element automatically closes the valve, preventing delivery of scalding untempered hot water (on cold supply failure) or cold-only water (on hot supply failure) to the outlet. This fail-safe behavior is a requirement of EN1111 and provides essential scald protection at the point of use
- Integral check valves and strainers on both inlets – Built-in check valves on both the hot and cold inlets prevent cross-flow between supply circuits, and integrated strainers protect the thermostatic cartridge from particulate debris. No separate inline backflow prevention or filtration is required upstream of the valve, reducing the total component count and installation complexity
- High flow rate with low pressure drop across all four sizes – The hydraulic design of the 910018CC is optimized for high flow capacity relative to pressure drop across all four sizes, from DN15 to DN40. At DN40, the valve handles flow rates above 8000 L/h at 3 bar pressure differential, making it suitable for central mixing stations serving multiple fixtures or large commercial hot water distribution circuits
- Nickel-plated brass body with copper valve core and SUS304 spring – The nickel-plated brass body provides corrosion resistance and an aesthetically clean external finish for exposed installations. The copper valve core maintains dimensional stability under repeated thermal cycling, and the SUS304 stainless steel spring resists corrosion in hot water service over the full service life of the valve
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 910018CC |
| Standards | EN1111, EN1999, QB2606-2006 |
| Valve Body Material | Nickel-plated brass |
| Valve Core Material | Copper |
| Handle Material | Retardant ABS |
| Spring Material | SUS304 stainless steel |
| Temperature Adjustment Range | 30–65°C |
| Temperature Control Accuracy | ±2.0°C |
| Highest Working Temperature | 95°C |
| Maximum Static Pressure | 10 bar |
| Maximum Dynamic Pressure | 5 bar |
| Minimum Dynamic Pressure | 0.5 bar |
| Extreme Differential Pressure Ratio | 1:6 (H:C or C:H) |
| Integral Features | Check valves + strainers on both inlets; single-piece thermostatic cartridge |
| Factory Preset — DN15 & DN20 | 40°C |
| Factory Preset — DN25 & DN40 | 50°C |
| Size | Connection | A | B | C | D |
|---|---|---|---|---|---|
| DN15 | G1/2 | 110mm | 108mm | 52mm | 33mm |
| DN20 | G3/4 | 134mm | 115mm | 60mm | 38mm |
| DN25 | G1 | 165mm | 135mm | 70mm | 45mm |
| DN40 | G1-1/2 | 229mm | 163mm* | 90mm | 45mm |
*DN40 dimension B — refer to official datasheet for confirmed value.
Application & Use Cases
- Solar water heating system outlet mixing – The 95°C maximum working temperature makes the 910018CC directly suitable for installation at the outlet of solar thermal storage tanks, including evacuated tube systems that produce high storage temperatures during peak irradiance. The valve blends solar-heated water with cold supply to deliver a controlled outlet temperature in the 30–65°C range to the domestic hot water distribution system
- Central hot water mixing for multi-fixture residential and commercial systems – The DN25 and DN40 sizes — preset at 50°C and rated for flow rates above 4000 L/h (DN25) and 8000 L/h (DN40) at 3 bar — are suited to central mixing station installations serving multiple fixtures or entire building hot water distribution circuits in hotels, apartment buildings, and commercial facilities
- Point-of-use anti-scald protection at individual fixtures – The DN15 and DN20 sizes — preset at 40°C — are suited to point-of-use installation at individual showers, washbasins, and baths in residential and light commercial applications where the water heater storage temperature is maintained above the safe delivery temperature for Legionella control
- Electric storage water heater installations – Where electric storage tanks are set above 60°C for hygiene, the 910018CC installed at the tank outlet blends down the storage temperature to a safe delivery temperature for distribution, eliminating scald risk at fixtures while maintaining the tank temperature required for Legionella suppression
- High-temperature industrial and process hot water supply – The 95°C maximum working temperature and DN40 size availability make the 910018CC suitable for industrial hot water mixing applications where supply temperatures and flow rates exceed the range of standard domestic TMV products
- Chinese market and export projects requiring QB2606-2006 compliance – QB2606-2006 certification confirms the 910018CC meets the Chinese national standard for thermostatic mixing valves. Combined with EN1111 and EN1999, this makes the series suitable for both domestic Chinese projects and export projects requiring European standard compliance from a single product
Installation Notes
- Before installation, calculate the total hourly water consumption of all connected fixtures to select the correct DN size. If a single valve cannot meet the peak flow demand, multiple valves of the same DN size can be installed in parallel on a shared supply manifold — minimum flow accumulates across parallel units
- Thoroughly flush all pipework before installing the valve. Connect the inlet marked “H” to the hot water supply and the inlet marked “C” to the cold water supply. Install stop valves, strainers, and union fittings at both inlets to allow the valve to be isolated and serviced without draining the system
- Verify that both hot and cold supply temperatures and pressures are within the valve’s operating range before commissioning. Minimum dynamic pressure at both inlets must be at least 0.5 bar. The extreme differential pressure ratio between hot and cold inlets must not exceed 1:6 — if the ratio is exceeded, install a pressure-reducing valve on the higher-pressure supply upstream
- The temperature adjustment handle is factory preset at 40°C for DN15 and DN20, and at 50°C for DN25 and DN40. Do not rotate the handle before installation and commissioning are complete. After water supply is confirmed normal, slowly rotate the handle in the direction of the hot or cold arrow indicators on the handle top until the outlet temperature is correct. Verify with a calibrated thermometer
- Factory commissioning conditions are hot water at 65°C, cold water at 15°C, and supply pressure at 3 bar on both inlets. If actual site conditions differ from these parameters, some initial deviation between the handle position and the actual outlet temperature is normal and will stabilize as the system reaches steady state
- If outlet temperature is persistently higher than the set value, check cold water supply pressure (must be above 0.5 bar) and confirm the cold water pipework is not blocked. If outlet temperature is persistently lower than set, check hot water supply pressure and confirm hot water pipework is not blocked. A pressure drop across the valve exceeding 0.5 bar when both supply pressures are at or above 2.0 bar is abnormal and indicates a flow restriction in the valve body requiring service
- When the cold water supply is isolated, the hot water flow should reduce to near-zero within 8 seconds. If hot water continues to flow beyond this time, check that the inlet strainers are clean and that the hot water source temperature is above 50°C — the thermostatic fail-safe requires adequate temperature differential to function correctly
Frequently Asked Questions
How does the 910018CC differ from the 910010CC and 910011CC in the Legom TMV lineup?
The 910010CC (15mm) and 910011CC (22mm) are certified specifically to TMV3 Specification D 08 for UK healthcare premises, with fixed TMV3 application codes defining maximum outlet temperatures for specific fixture types. They are designed to meet the requirements of NHS Health Technical Memorandum HTM 04-01 and require annual testing to maintain TMV3 scheme approval. The 910018CC is certified to EN1111, EN1999, and QB2606-2006 — a different certification set suited to general European and Chinese market applications rather than the UK healthcare-specific TMV3 scheme. The 910018CC also covers a wider size range (DN15 to DN40 vs 15mm and 22mm only), offers a broader temperature adjustment range (30–65°C vs TMV3 fixed application codes), has a higher maximum working temperature (95°C), and uses a nickel-plated brass body rather than DR brass.
Why does the factory preset temperature differ between DN15/DN20 and DN25/DN40?
The smaller sizes (DN15 and DN20) are typically used for point-of-use installation at individual fixtures such as showers and washbasins, where a 40°C outlet temperature aligns with comfortable and safe delivery temperatures for personal hygiene use. The larger sizes (DN25 and DN40) are more commonly used as central mixing valves supplying hot water distribution circuits for multiple fixtures or entire building sections, where a 50°C preset provides a higher distribution temperature that accommodates heat loss along the distribution pipework before the water reaches individual outlets. Both factory presets are adjustable across the full 30–65°C range after commissioning.
What does EN1999 certification add beyond EN1111?
EN1111 covers thermostatic mixing valves for mains-pressure sanitary use up to 1000 kPa (10 bar), specifying requirements for temperature control accuracy, fail-safe shutoff, and endurance. EN1999 specifically addresses thermostatic mixing valves for use with solar and electric storage water heaters, including performance requirements under the higher inlet temperature conditions these systems produce. The 910018CC’s EN1999 certification confirms it meets the additional requirements for solar thermal applications — including operation at the elevated inlet temperatures that evacuated tube and flat-plate collectors produce — beyond what EN1111 alone covers for standard sanitary applications.
What does the 1:6 extreme differential pressure ratio mean?
The 1:6 extreme differential pressure ratio means the pressure on either the hot or cold inlet must not exceed the other by more than a 6:1 ratio. If, for example, the cold supply pressure is 3 bar, the hot supply pressure must be at least 0.5 bar (3 ÷ 6). Conversely, if the hot supply pressure is 3 bar, the cold must be at least 0.5 bar. Operating beyond this ratio causes significant mixing accuracy degradation because the thermostatic cartridge cannot compensate for such a large pressure imbalance between inlets. If the actual supply pressures exceed this ratio, install a pressure-reducing valve on the higher-pressure inlet upstream of the 910018CC.
Can the DN40 910018CC be used as a central mixing valve for a hotel or apartment building?
Yes. The DN40 size is specifically intended for central mixing station applications in larger buildings. At 3 bar differential pressure, the DN40 delivers flow rates above 8000 L/h, making it capable of supplying the peak hot water demand of multi-floor apartment buildings, hotel wings, or commercial facility sections from a single valve. For very large buildings where even the DN40 flow capacity is insufficient for peak demand, multiple DN40 valves can be installed in parallel — minimum flow accumulates across parallel units and total capacity scales accordingly. Contact the Legom team with the system flow and pressure requirements for sizing guidance on large central mixing station configurations.
OEM & ODM Customization
Legom supports OEM and ODM services for the 910018CC Thermostatic Mixing Valve series. Customization options include pipe size, outlet temperature range, factory preset temperature, connection thread type, and surface finish. Custom material specifications and certification standard adaptations are available for specific market requirements. All customization projects are developed with the Legom engineering team to confirm suitability for the intended application. Contact us via WhatsApp or info@legomsmart.com.
User Manual
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.
