HFT40011Z-01 Thermostatic Valve, G3/4
The Legom HFT40011Z-01 Thermostatic Valve is a G3/4 thermostatic mixing valve combining a union water inlet joint with the same proven thermostatic mixing platform as the wider HFT series — temperature adjustment range 20–60°C, control accuracy ±2°C, working pressure range 0.03–1 MPa. The union inlet allows the hot water supply connection to be broken and re-made without rotating the full valve body, reducing installation complexity in confined spaces and speeding up cartridge access during periodic servicing.
Manufactured from 57-3 copper with surface plating, the HFT40011Z-01 suits domestic and light commercial water heater installations where the G3/4 connection is standard and the union inlet simplifies the plumber’s work on site. Compatible with hot water inlet temperatures of 30–99°C and cold water inlet of 5–29°C, covering all standard water heater types. Factory-preset temperature ranges available for OEM orders.
Key Benefits
- Union water inlet joint for easier installation and servicing – The union inlet connection allows the hot water supply to be disconnected without rotating the valve body, making installation in tight under-sink, behind-panel, or wall-cavity locations significantly faster, and enabling cartridge access without a full valve removal
- G3/4 connection — most common domestic TMV size – Direct compatibility with standard domestic water heater outlets and G3/4 pipework without requiring reducers or adapters
- ±2°C temperature control accuracy – Consistent mixed water delivery within ±2°C of the set point across varying supply pressure and temperature conditions
- 20–60°C adjustment range – ABS black handwheel allows full-range commissioning adjustment, with factory-preset narrower ranges available for safety-restricted applications
- No electricity required – Self-acting thermostatic operation requiring no electrical connection or control signal at the valve
- 57-3 copper with surface plating – Durable copper alloy body with protective surface plating for corrosion resistance in potable hot water service
- Wide pressure range 0.03–1 MPa – Covers gravity-fed low-pressure systems through standard mains-pressure water supply
- Customizable preset temperature ranges – OEM orders can specify factory-preset ranges for restricted-adjustment applications
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HFT40011Z-01 |
| Body Material | 57-3 copper, surface plated |
| Handwheel | ABS black |
| Connection | G3/4 internal thread |
| Inlet Joint Type | Union water inlet joint |
| Temperature Adjustment Range | 20–60°C (standard); 35–55°C / 40–50°C / 30–60°C (preset options) |
| Temperature Control Accuracy | ± 2°C |
| Working Pressure Range | 0.03 MPa – 1 MPa |
| Ideal Working Pressure | 0.1 MPa – 0.5 MPa |
| Cold Water Temperature Range | 5°C – 29°C |
| Hot Water Temperature Range | 30°C – 99°C |
| Primary Use | Water heater (domestic and light commercial) |
G3/4 Union Inlet TMV Variants — Comparison
| Model | Handwheel | Scale | Best For |
|---|---|---|---|
| HFT40011Z-01 | Black plain | Unmarked | Standard domestic — thermometer commissioning |
| HFT40020Z-01 | Black silk-screen | Numbered 1–7 MAX | Documented setting — repeatable without thermometer |
Application & Use Cases
- Standard domestic water heater installations – The most common application — installed on the outlet of a domestic electric, gas, solar thermal, or heat pump water heater where G3/4 is the outlet connection size and the union inlet simplifies the plumber’s installation workflow
- Confined installation locations – Under-sink, in-wall, and behind-panel TMV installations where the union inlet’s ability to break the water connection without rotating the valve body is particularly valuable in tight clearances
- Solar thermal water heating systems – Where storage tank temperatures regularly reach high levels and a reliable, easy-to-service TMV is required at the distribution outlet
- Light commercial water heater outlets – Small offices, guesthouses, and hospitality properties with G3/4 water heater connections where a union inlet TMV simplifies annual cartridge inspection
- Retrofit installations – Replacing an existing TMV in an established installation where the union inlet allows the new valve to be connected without modifying surrounding pipework
Installation Notes
- Connect hot water supply via the union inlet — fit the union tail piece to the hot supply pipe first, then connect the valve body by tightening the union nut. Cold water and mixed outlet connections use standard G3/4 thread
- Use appropriate thread sealant on all threaded connections. For the union joint, ensure the sealing washer or O-ring is correctly seated before tightening
- Install isolation valves upstream of both hot and cold inlets to enable full servicing without shutting down the water supply
- Install a strainer on the cold inlet to protect the thermostatic cartridge from grit and debris
- The valve performs optimally at 0.1–0.5 MPa — verify inlet pressure at the installation point at peak flow conditions
- After installation, run hot water from the furthest fixture and verify outlet temperature with a calibrated thermometer before commissioning for occupant use
- Flush supply lines before installation to remove debris that could damage the thermostatic cartridge
Frequently Asked Questions
What is the difference between the HFT40011Z-01 and the HFT40020Z-01?
Both are G3/4 thermostatic mixing valves with union water inlet joints and identical thermostatic performance. The difference is the handwheel: the HFT40011Z-01 has a plain black ABS handwheel without scale markings, while the HFT40020Z-01 has a numbered 1–7 MAX silk-screen scale that allows the set temperature position to be recorded and reproduced without a thermometer. Choose the HFT40011Z-01 for standard domestic installations where commissioning temperature is verified by thermometer and the scale position does not need to be documented. Choose the HFT40020Z-01 for managed properties, commercial installations, or applications where the set position must be reproducible across maintenance visits.
Why use a union inlet rather than a standard threaded connection?
A union inlet allows the hot water supply connection to be broken by loosening a single nut, without rotating the valve body. In standard threaded connections, disconnecting the valve requires rotating the entire body, which can be impossible in tight spaces and risks disturbing adjacent connections. The union inlet is particularly useful in retrofit situations and confined installations, and it makes annual cartridge inspection significantly faster since the hot supply can be disconnected and reconnected in seconds.
Can the temperature range be factory-preset?
Yes. OEM and project orders can specify factory-preset temperature ranges of 35–55°C, 40–50°C, or 30–60°C that mechanically restrict handwheel travel. Contact the Legom team to specify the required preset range when ordering.
OEM & ODM Customization
Legom supports OEM and ODM services for the HFT40011Z-01 Thermostatic Valve. Customization options include preset temperature range, connection size, body finish, and handwheel design. 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.
