910034NT Mini Thermostatic Mixing Valve
The Legom 910034NT MINI Thermostatic Mixing Valve is a compact, high-specification thermostatic mixing valve certified to ASSE1070, CSA B125.3, and NSF61/NSF372 — the primary North American standards for thermostatic mixing valves in sanitary, heating, and solar water heating applications. Unlike standard TMVs that require separate inline check valves and strainers, the 910034NT integrates check valves and strainers directly into the valve body, delivering a complete, self-contained mixing station in a single compact unit.
The single-piece thermostatic cartridge provides reliable temperature control with an outlet temperature range of 80–120°F (26.7–49°C) and temperature stability of ±3°F. An automatic shutoff feature closes the valve in the event of hot or cold water supply failure — preventing delivery of scalding untempered hot water or cold-only water if either supply is lost. Operating pressure range spans from a minimum of 20 psi (138 kPa) to a maximum of 150 psi (1034 kPa), with a minimum stable flow rate of 1 GPM.
Key Benefits
- ASSE1070, CSA B125.3, NSF61/NSF372 certified – Triple certification to the primary North American regulatory standards for thermostatic mixing valves confirms performance, materials, and construction meet requirements for use in regulated plumbing work in the United States and Canada — essential for code-compliant installations in these markets
- Integral check valves and strainers – Built-in check valves on both the hot and cold inlets prevent cross-flow between supply circuits, and integrated strainers at both inlets protect the thermostatic cartridge from particulate debris — eliminating the need for separately installed inline check valves and strainers and reducing the total component count at the installation point
- Automatic shutoff on supply failure – If either the hot or cold water supply fails, 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 outlets
- Single-piece thermostatic cartridge – A self-contained single-unit cartridge simplifies servicing — the entire thermostatic element can be replaced as a single component without dismantling the valve body
- Wide operating pressure range 20–150 psi (138–1034 kPa) – Covers both low-pressure domestic supply systems and high-pressure mains-connected installations up to the 150 psi maximum, accommodating the full range of North American residential and light commercial water supply pressures
- Outlet temperature control 80–120°F (26.7–49°C) – Adjustment range covers the full spectrum of safe domestic hot water delivery temperatures, from warm (80°F/27°C) to the maximum recommended point-of-use delivery temperature for scald protection (120°F/49°C)
- Minimum 10°C inlet-outlet temperature differential requirement – The valve requires at least 18°F (10°C) differential between the hot inlet temperature and the desired mixed outlet temperature for effective thermostatic control — ensure the hot supply is set at least 10°C above the desired outlet temperature
- NSF61 and NSF372 material compliance – NSF61 confirms the valve materials do not contribute contaminants to drinking water above safe levels. NSF372 confirms compliance with low-lead content requirements for plumbing products used in potable water systems
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 910034NT |
| Material | Brass |
| Standards | ASSE1070, CSA B125.3, NSF61, NSF372 |
| Minimum Supply Pressure | 20 psi (138 kPa) |
| Maximum Supply Pressure | 150 psi (1034 kPa) |
| Min. H/M Inlet-Outlet Temp. Differential | 18°F (10°C) |
| Max. Inlet Pressure Ratio (H/C or C/H) | 30% |
| Hot Inlet Temperature Range | 120–200°F (49–90°C) |
| Cold Inlet Temperature Range | 37.4–80°F (3–27°C) |
| Outlet Temperature Control Range | 80–120°F (26.7–49°C) |
| Temperature Stability | ± 3°F |
| Minimum Flow Rate (stable operation) | 1 GPM |
| Integral Features | Check valves + strainers on both inlets |
| Cartridge Type | Single-piece thermostatic cartridge |
Application & Use Cases
- Code-compliant point-of-use scald protection in North American installations – ASSE1070 certified TMVs are specified by code in many US and Canadian jurisdictions for point-of-use installation at showers, baths, and basins in healthcare, childcare, aged care, and public accommodation facilities to limit hot water delivery temperature and prevent scalding
- Domestic hot water anti-scald protection – Installed at individual fixture supply connections or at the water heater outlet in residential applications where the water heater storage temperature is set above the safe delivery temperature for Legionella control
- Solar and electric water heating systems – The 49–90°C hot inlet temperature range covers both electric storage and solar thermal collector output temperatures, making the 910034NT suitable for direct installation at solar-heated water storage outlets
- Sanitary installations in commercial and institutional buildings – Hotels, hospitals, schools, and sports facilities in North American markets where ASSE1070 certification is a regulatory or insurance requirement for TMV installations
- Heating and cooling system connections – Applied at hydronic heating system connections where the delivered water temperature must be limited to a safe level for user-contact surfaces
Installation Notes
- The 910034NT has integral check valves and strainers at both inlets — separate inline check valves and strainers are not required upstream of this valve
- Ensure the hot inlet temperature is at least 18°F (10°C) above the desired mixed outlet temperature for stable thermostatic control. If the hot supply temperature is too close to the desired outlet temperature, the valve cannot blend effectively
- The inlet pressure ratio between hot and cold must not exceed 30% — that is, neither the hot nor cold supply pressure should exceed the other by more than 30%. Significant pressure imbalance between hot and cold inlets affects mixing accuracy. Install a pressure balancing valve upstream if the supply pressures are significantly unequal
- Minimum supply pressure at both inlets must be at least 20 psi (138 kPa). Do not install in gravity-fed or very low pressure systems below this threshold
- Install with the hot inlet labeled “H” connected to the hot supply and the cold inlet labeled “C” connected to the cold supply. Verify “MIX” outlet orientation before connecting distribution pipework
- After installation, set the outlet temperature using the adjustment mechanism and verify the mixed outlet temperature at the furthest fixture with a calibrated thermometer before commissioning
- The integrated strainers require periodic cleaning — inspect and clean according to local water quality conditions, typically annually in standard municipal water supply
Frequently Asked Questions
What is ASSE1070 and why is it important?
ASSE1070 is the American Society of Sanitary Engineering standard for water temperature limiting devices used at point-of-use locations — individual fixture outlets — in plumbing systems. It covers thermostatic mixing valves that limit delivered water temperature to prevent scalding. Many US states and Canadian provinces require ASSE1070 certified TMVs in healthcare, childcare, aged care, and lodging facilities. Some jurisdictions also require ASSE1070 compliance in all new residential construction. Specifying an ASSE1070 certified valve like the 910034NT ensures regulatory compliance in markets where this certification is a code requirement.
What does the automatic shutoff feature do?
If the cold water supply fails while the valve is open, an unprotected TMV would deliver scalding untempered hot water directly to the outlet — a serious scald hazard. The 910034NT’s automatic shutoff feature senses the loss of cold inlet pressure and closes the valve, stopping all flow rather than delivering dangerous hot water. Similarly, if the hot supply fails, the valve closes rather than delivering cold-only water. This fail-safe behavior is a requirement of ASSE1070 and provides an essential safety protection layer beyond simple temperature control.
What does NSF61 and NSF372 certification mean?
NSF61 is the standard for drinking water system components — it confirms that the materials used in the 910034NT do not leach harmful contaminants into drinking water above established safe concentration limits. NSF372 is the lead content standard for plumbing products, confirming the valve meets the definition of “lead-free” under the US Safe Drinking Water Act (weighted average lead content of 0.25% or less across wetted surfaces). Both certifications are required for plumbing products used in potable water systems in most US states and Canadian provinces under their plumbing codes.
Why is there a minimum flow rate requirement?
The thermostatic cartridge in the 910034NT requires a minimum flow of 1 GPM through the valve to operate stably. Below this flow rate, the thermostatic element does not receive sufficient water movement across its sensing surface to accurately measure and control the mixed outlet temperature — resulting in temperature instability or oscillation. Ensure the fixture or circuit connected to the mixed outlet draws at least 1 GPM during normal operation. If the intended flow rate is below 1 GPM, contact the Legom team about alternative valve options.
OEM & ODM Customization
Legom supports OEM and ODM services for the 910034NT MINI Thermostatic Mixing Valve. Customization options include outlet temperature range, connection size, and body configuration. All customization projects maintain compliance with applicable certification standards. Contact us via WhatsApp or info@legomsmart.com.
Datasheet
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.
