DN40 Thermostatic Valve HFT70001
The Legom HFT70001 DN40 Thermostatic Valve is a large-bore thermostatic mixing valve for commercial water heater installations, delivering precise temperature-controlled hot water at high flow rates. Sharing the same thermostatic mixing performance as the HFT70002 — including a temperature adjustment range of 20–60°C, control accuracy of ±2°C, and working pressure range of 0.03–1 MPa — the HFT70001 is the mid-range commercial model in the Legom HFT thermostatic valve series, positioned between the domestic HFT30001 (G1/2, G3/4) and the larger HFT70002.
Manufactured from 57-3 copper with nickel plating with a silk-screen ABS black handwheel, the HFT70001 operates across hot water inlet temperatures of 30–99°C and cold water inlet temperatures of 5–29°C, covering all standard commercial water heater types including electric storage, gas-fired, solar thermal, and heat pump systems. Factory-preset temperature ranges are available for OEM and project orders requiring restricted operator adjustment.
Key Benefits
- Mid-range commercial flow capacity – Sized between the domestic HFT30001 and the larger HFT70002, the HFT70001 serves commercial installations requiring higher flow than DN20 can provide but where the full DN50 bore of the HFT70002 is not required
- Temperature control accuracy of ±2°C – Consistent mixed water delivery within ±2°C of the set point regardless of supply pressure and temperature fluctuations, providing reliable safety performance across commercial hot water distribution systems
- 20–60°C adjustment range – The handwheel allows commissioning engineers to set the delivery temperature across the full range, with factory-preset narrower ranges available for restricted-adjustment applications
- No electricity required – Self-acting thermostatic operation powered by the differential temperature of the supply waters, with no electrical connection or controls needed at the valve
- 57-3 copper with nickel plating – Corrosion-resistant body construction for long-term service in continuous commercial hot water applications
- Wide pressure range of 0.03–1 MPa – Covers both gravity-fed and mains-pressure commercial water supply systems
- Compatible with all commercial heater types – 30–99°C hot inlet range covers electric, gas, solar, and heat pump commercial water heating systems
- OEM and ODM customization available – Preset temperature range, body finish, and connection specifications can be customized for project requirements
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | HFT70001 |
| Body Material | 57-3 copper, nickel plated |
| Handwheel | ABS black silk-screen, 40mm |
| Connection | G2 internal thread (DN40) |
| 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 | Commercial water heater systems |
Note: The product URL references DN40. Please confirm the exact bore diameter with the Legom technical team before specifying for projects where the precise pipe bore is a design constraint.
HFT Thermostatic Valve Range — Full Series
| Model | Connection | Nominal Bore | Typical Application |
|---|---|---|---|
| HFT30001 | G1/2 | DN15 | Single fixture, small domestic heater |
| HFT30001 | G3/4 | DN20 | Standard domestic water heater |
| HFT70001 | G2 | DN40 | Mid-range commercial systems |
| HFT70002 | G2 | DN50 | Large commercial / industrial systems |
Application & Use Cases
- Mid-size commercial buildings requiring centralized temperature control – Office buildings, smaller hotels, schools, and medium-density residential blocks where hot water demand exceeds what DN20 can provide but does not require the full capacity of DN50
- Commercial solar thermal installations – Solar storage systems in schools, guesthouses, and small commercial facilities where storage temperatures regularly exceed safe delivery limits and a central mixing valve is required to serve multiple outlets
- Care homes and healthcare facilities with moderate flow demand – Facilities requiring precisely controlled safe water temperature for vulnerable residents where the system flow rate falls in the range suited to DN40 capacity
- Commercial gas-fired and electric storage water heaters – Installed on the outlet of commercial storage vessels where the heater’s storage temperature is maintained above 60°C for Legionella control and the HFT70001 blends down to safe delivery temperature for the building’s outlets
- Industrial washroom facilities – Manufacturing plants and logistics facilities with moderate-volume hot water demand for worker welfare washrooms, where DN40 flow capacity is matched to the number of simultaneous wash stations
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 building distribution pipework
- Install isolation valves on both hot and cold inlets upstream of the HFT70001 to enable servicing without shutting down the building hot water supply
- Install a strainer on the cold inlet upstream of the valve to protect the thermostatic cartridge from debris
- G2 internal thread connections require male G2 fittings. Use appropriate thread sealant rated for continuous hot water service
- The valve performs optimally at 0.1–0.5 MPa. Verify inlet pressure is within this range at the installation point under peak flow conditions
- After installation, verify outlet temperature at the furthest fixture using a calibrated thermometer before commissioning the system for occupant use
- Installation and commissioning must be carried out by a qualified plumber or HVAC engineer
Frequently Asked Questions
When should I choose the HFT70001 over the HFT70002?
Both valves share identical performance specifications — the difference is flow capacity based on bore size. Choose the HFT70001 when the system’s peak simultaneous hot water demand can be met at the valve’s DN40 bore without excessive pressure drop. Choose the HFT70002 (DN50) when higher flow rates are required. As a general guideline, DN40 suits systems with moderate commercial demand — smaller hotels, care homes, schools — while DN50 suits larger hotels, hospitals, and high-density residential blocks. For accurate sizing, calculate the peak simultaneous flow demand and verify it against the valve’s Kvs value at the available pressure differential. Contact the Legom team for flow sizing assistance.
Can the adjustment range be restricted for safety compliance?
Yes. Factory-preset temperature ranges of 35–55°C, 40–50°C, or 30–60°C are available on OEM and project orders, mechanically limiting the handwheel adjustment range. This is required in many healthcare, education, and aged care facilities where building codes or duty-of-care standards restrict the maximum hot water delivery temperature accessible to non-technical staff.
What maintenance schedule is recommended for commercial installations?
In commercial service, the thermostatic cartridge should be inspected at least annually and the cold inlet strainer cleaned quarterly. In hard water areas, descaling of the cartridge may be required annually. Full cartridge replacement should be considered every 3–5 years depending on water quality and usage intensity. Contact the Legom team for cartridge replacement specifications for the HFT70001.
OEM & ODM Customization
Legom supports OEM and ODM services for the HFT70001 DN40 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.
