HFT40010Z-01 Thermostatic Valve, G1/2
The Legom HFT40010Z-01 Thermostatic Valve is a compact G1/2 thermostatic mixing valve with a union water inlet joint, combining the convenience of union-disconnect installation with the standard domestic connection size for smaller water heater outlets and single-fixture applications. Sharing the same thermostatic mixing performance as the wider HFT series — temperature adjustment range 20–60°C, control accuracy ±2°C, working pressure range 0.03–1 MPa — the HFT40010Z-01 is the smallest union-inlet model in the Legom HFT thermostatic valve range.
Manufactured from 57-3 copper with surface plating, compatible with hot water inlet temperatures of 30–99°C and cold water inlet of 5–29°C. The union inlet allows the hot supply to be connected and disconnected without rotating the valve body, reducing installation time in tight under-sink and point-of-use locations where G1/2 connections are most commonly found. Factory-preset temperature ranges available for OEM orders.
Key Benefits
- Union water inlet — smallest union TMV in the HFT range – Brings the union-disconnect advantage to G1/2 (DN15) installations, including point-of-use fixture applications and compact water heaters where rotating a full valve body for installation or removal is impractical
- G1/2 connection for compact installations – Suits single-fixture point-of-use applications, small domestic water heaters, and installations where the supply pipework or heater outlet is 1/2″ diameter
- ±2°C temperature control accuracy – Consistent mixed water delivery within ±2°C of the set point across varying supply conditions
- 20–60°C full adjustment range – ABS black handwheel for commissioning flexibility, with factory-preset narrower ranges available for safety-restricted applications
- No electricity required – Self-acting thermostatic operation with no electrical connection needed
- 57-3 copper with surface plating – Durable copper alloy body with protective surface plating for potable hot water service
- Wide pressure range 0.03–1 MPa – Including low-pressure gravity-fed systems from 0.03 MPa
- Customizable preset temperature ranges – OEM orders can specify factory-preset ranges for restricted-adjustment applications
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HFT40010Z-01 |
| Body Material | 57-3 copper, surface plated |
| Handwheel | ABS black |
| Connection | G1/2 internal thread (DN15) |
| 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) |
HFT Union Inlet Series — Size Comparison
| Model | Connection | Handwheel Scale | Typical Use |
|---|---|---|---|
| HFT40010Z-01 | G1/2 union inlet | Plain black | Single fixture, small domestic heater |
| HFT40011Z-01 | G3/4 union inlet | Plain black | Standard domestic heater |
| HFT40020Z-01 | G3/4 union inlet | Numbered 1–7 MAX | Documented setting, managed properties |
Application & Use Cases
- Single-fixture point-of-use installations – Installed close to an individual basin, shower, or bath where G1/2 is the standard connection size and the union inlet simplifies installation in the tight space typically available at point-of-use locations
- Small domestic water heaters with G1/2 outlets – Compact electric storage units, instantaneous water heaters, and small solar thermal systems with G1/2 outlet connections
- Under-sink installations – Where the valve is installed in a vanity cabinet or kitchen under-sink space, the union inlet allows the hot supply to be connected and disconnected without needing to rotate the valve in the confined cabinet space
- Retrofit and replacement applications – Replacing a failed G1/2 TMV in an existing installation where the union inlet simplifies the swap without requiring modification to surrounding pipework
- Vulnerable user domestic environments – Point-of-use scald protection at individual outlets serving elderly, disabled, or young occupants, with preset range option available for restricted adjustment
Installation Notes
- Fit the union tail piece to the hot water supply pipe first using appropriate thread sealant, then connect the valve body by tightening the union nut — no rotation of the valve body required
- Connect cold water supply to the cold inlet (C) and mixed outlet (M) to the fixture supply using male G1/2 fittings with thread sealant
- Ensure the union sealing washer or O-ring is correctly seated before tightening the union nut — hand-tight plus a quarter turn is sufficient
- Install isolation valves upstream of both hot and cold inlets
- Install a strainer on the cold inlet to protect the thermostatic cartridge
- Verify outlet temperature at the fixture with a calibrated thermometer after installation and before commissioning for occupant use
- The valve performs optimally at 0.1–0.5 MPa
Frequently Asked Questions
When should I choose the HFT40010Z-01 over the HFT40011Z-01?
Choose the HFT40010Z-01 when the water heater outlet or supply pipework is G1/2 (1/2″ diameter). Choose the HFT40011Z-01 when the connection is G3/4 (3/4″ diameter). Both have union inlets and identical thermostatic performance — the only difference is connection size. G1/2 is typically found on compact domestic water heaters and point-of-use applications; G3/4 is the standard for most domestic storage water heaters and light commercial units.
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.
What maintenance does the HFT40010Z-01 require?
The thermostatic cartridge should be inspected annually. The union inlet makes this straightforward — loosen the union nut, remove the valve from the hot supply, and the cartridge is accessible without disturbing the cold or mixed connections. In hard water areas, descaling of the cartridge may be required annually. Contact the Legom team for cartridge replacement specifications for the G1/2 model.
OEM & ODM Customization
Legom supports OEM and ODM services for the HFT40010Z-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.
