HFT40004Z-01 Thermostatic Mixing Valve, G1
The Legom HFT40004Z-01 Thermostatic Mixing Valve is a G1 internal thread thermostatic mixing valve featuring a spark pattern silk-screen handwheel and nickel-plated 57-3 copper body, combining the standard HFT thermostatic mixing performance with a distinctive decorative handwheel finish suited to visible installations where appearance matters alongside function. Temperature adjustment range 20–60°C, control accuracy ±2°C, working pressure range 0.03–1 MPa, compatible with hot water inlet 30–99°C and cold water inlet 5–29°C.
The G1 internal thread connector provides DN25 flow capacity suited to larger domestic and light commercial water heater installations requiring more throughput than standard G3/4 domestic models. Factory-preset temperature ranges are available for OEM orders requiring restricted operator adjustment.
Key Benefits
- Spark pattern silk-screen handwheel – Distinctive decorative graphic print on the handwheel surface provides a premium visual finish that differentiates the HFT40004Z-01 from standard plain or numbered handwheel models, suited to visible plant room or semi-exposed installations where a distinctive appearance is a product or OEM requirement
- Nickel-plated copper body – Nickel plating over 57-3 copper provides corrosion resistance with a consistent silver-toned surface finish, coordinating with the spark pattern handwheel for a unified premium appearance
- G1 connection (DN25) for higher domestic and light commercial flow – Positioned above standard G3/4 domestic models, suited to larger domestic storage water heaters and light commercial installations where G3/4 flow capacity is insufficient
- ±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 – Full-range commissioning flexibility with factory-preset narrower ranges available for safety-restricted applications
- No electricity required – Self-acting thermostatic operation with no electrical connection needed at the valve
- 57-3 copper with nickel plating – Premium construction for long-term potable hot water service
- Wide pressure range 0.03–1 MPa – Covers gravity-fed through standard mains-pressure systems
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HFT40004Z-01 |
| Body Material | 57-3 copper, nickel plated |
| Handwheel | ABS black, spark pattern silk-screen |
| Connection | G1 internal thread (DN25) |
| 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 (larger domestic and light commercial) |
G1 Thermostatic Valve Options at a Glance
| Model | Technology | Handwheel | Body Finish | Configuration |
|---|---|---|---|---|
| HFT40004Z-01 | Wax cartridge | Spark pattern silk-screen | Nickel plated | Standard inline |
| HFT40018T-01 | SMA element | White silk-screen | Nickel plated | Standard inline |
| HFT40024Z-01 | Wax cartridge | Plain black | Surface plated | Side outlet |
| HFT40015Z-01 | Wax cartridge | Plain black | Surface plated | Bottom inlet / side outlet |
Application & Use Cases
- Larger domestic water heaters requiring G1 flow capacity – Homes with large-volume electric or solar storage water heaters where the G3/4 domestic models are undersized and the G1 bore provides adequate throughput for the household’s simultaneous hot water demand
- OEM water heater products with premium handwheel specifications – Manufacturers specifying a distinctive handwheel appearance for product differentiation, where the spark pattern silk-screen finish provides a design element that distinguishes their product from competitors using plain handwheel TMVs
- Visible installations where appearance is a consideration – Plant rooms, utility areas, or semi-exposed valve locations where the premium nickel-plated body and distinctive handwheel provide a more finished appearance than standard plated models
- Light commercial water heating systems – Small commercial buildings, guesthouses, and facilities where G1 connection capacity matches the system demand and the valve’s appearance suits a customer-visible installation environment
- Solar thermal and heat pump water heaters – Larger storage systems where G1 flow capacity is required and the nickel-plated body provides additional corrosion resistance in demanding thermal cycling environments
Installation Notes
- Connect hot water supply to the hot inlet (H), cold water supply to the cold inlet (C), and mixed water outlet (M) to the distribution pipework using male G1 fittings with appropriate thread sealant
- Install isolation valves upstream of both hot and cold inlets to enable 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 is within this range at peak flow
- After installation, verify outlet temperature at the furthest fixture 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
How does the HFT40004Z-01 differ from the HFT40018T-01 at the same G1 connection size?
Both are standard inline G1 thermostatic mixing valves with nickel-plated copper bodies and identical pressure and temperature specifications. The key difference is the thermostatic element and handwheel. The HFT40004Z-01 uses a conventional wax cartridge element with a distinctive spark pattern silk-screen handwheel. The HFT40018T-01 uses a shape memory alloy (SMA) element — providing superior long-term calibration stability and no wax capsule leakage risk — with a white silk-screen handwheel. Choose the HFT40004Z-01 when the spark pattern handwheel finish is a product or OEM requirement. Choose the HFT40018T-01 when premium element longevity is the priority.
What is a spark pattern silk-screen handwheel?
Silk-screen printing is a process that applies a graphic pattern or text directly to the handwheel surface using a screen-printed ink layer, which is then cured to create a durable decorative finish. The spark pattern refers to a specific graphic motif printed on the handwheel — a design element that gives the valve a distinctive appearance compared to plain or simply numbered handwheel models. The silk-screen finish is resistant to normal handling and water exposure in the installation environment.
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 HFT40004Z-01 Thermostatic Mixing Valve. Customization options include handwheel graphic design, preset temperature range, connection size, and body finish. The spark pattern handwheel can be replaced with a custom OEM graphic or color specification. 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.
