Wax Thermostatic Element
Manufacturer & Supplier in China
Legom is a factory-direct wax thermostatic element manufacturer and supplier in China, producing ACS and WRAS certified elements at our own facility in Jiaxing, Zhejiang Province. With a patented wax formula, in-house tooling, and 100% end-of-line testing on every unit, Legom supplies OEM valve and faucet manufacturers in 90+ countries with consistent, independently verified thermostatic elements for plumbing, HVAC, automotive, and industrial applications.
When you source wax thermostatic elements from Legom, you specify components engineered to meet EN-1111, EN-1999, EN-1287, NHS D08, ASSE1070, ASSE1071, ASSE1016, ASSE1017, CSA B125.3, and other international standards — backed by ACS and WRAS certification obtained through rigorous independent laboratory testing. ACS and WRAS certification requires institutional verification that most Chinese wax thermostatic element manufacturers do not hold.
Quality Meets Reliability
ACS, WRAS, CNAS, IAF and Eurofins Certified Wax Thermostatic Elements
Rapid Temperature Responsiveness
Precise Temperature Regulation
Durable Performance
Showing 1–12 of 36 results
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Wax Thermostatic Element LG001X
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Wax Thermostatic Element LG002X
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Wax Thermostatic Element LG003X
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Wax Thermostatic Element LG004X
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Wax Thermostatic Element LG005X
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Wax Thermostatic Element LG008X
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Wax Thermostatic Element LG013X
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Wax Thermostatic Element LG015X
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Wax Thermostatic Element LG016X/17X
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Wax Thermostatic Element LG018X
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Wax Thermostatic Element LG0304
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Wax Thermostatic Element LG034X
Product Range
Legom offers 36 wax thermostatic element models covering a wide spectrum of activation temperatures, stroke outputs, load ratings, and actuation profiles — from sub-zero freeze protection through near-boiling industrial applications. All models are built with Legom's proprietary patented wax formula, certified to ACS and WRAS standards, and rated for 100,000 cycles. OEM and ODM customization is available across the full range.
Standard Passive Elements (140N)
| Model | Activation Range | Key Stroke Data | Stroke Profile | Typical Application |
|---|---|---|---|---|
| LG043X | -5°C – 15°C | Sub-zero activation | Low-temp only | Freeze protection in extreme cold climates |
| LG001X | 1°C – 100°C | ≥4mm (1–4°C); ≥6mm (1–25°C); ≤10mm total | Wide-range; minimum stroke guarantee | Anti-freeze valves, solar thermal, high-temp HVAC |
| LG002X | 1.6°C – 90°C | 4.5±0.45mm (1.6–4°C); ≤6mm (4–25°C); ≤10mm total | Dual-range; freeze + full HVAC span | Anti-freeze valves, TMV assemblies; lifecycle verified at 30,000 and 100,000 cycles |
| LG015X | 1.6°C – 4°C (primary) | 3.5±0.35mm (1.6–4°C); ≤0.5mm above 4°C | Freeze-dedicated; locks out at normal temps | Dedicated freeze protection valves; heat pump pipe protection |
| LG034X | 1°C – 25°C (key sensing range) | Precise 1–25°C response | Wide application range | HVAC, plumbing, automotive, sanitary, military |
| LG004X | 15°C – 90°C | Four-stage: 15–38°C, 38–55°C, 55–60°C, 38–90°C | Multi-stage; earliest activation start | Thermostatic mixing valves, HVAC multi-point control |
| LG037X | 20°C – 90°C | Four-stage; ≤6.2mm total; body 13.2±0.3mm at 38°C | Multi-stage; shortest body in Legom range | Space-constrained valve assemblies with axial length restrictions |
| LG016X | 22°C – 60°C | Two-stage progressive stroke up to 60°C | Progressive two-stage | TMV assemblies, mid-range HVAC control |
| LG017X | 22°C – 44°C | Higher single-stage stroke in narrower band | Single-stage; higher stroke, narrower band | Precision low-to-mid temperature TMV control |
| LG005X | 22°C – 100°C | Three-stage: 22–28°C, 22–37°C, 22–100°C; ≤8mm total | Wide-range; stiffest spring (6N/mm) | Solar thermal, high-temp HVAC; applications requiring firm valve closing |
| LG003X | 32°C – 40°C | Two sub-bands: 32–34°C and 34–40°C | Narrow 8°C band; body-temperature precision | Body-temp safety devices, automotive, medical equipment |
| LG039X | ~35°C – 45°C | Comfort-range activation | Ambient-range TMV | Body-temperature sensitive plumbing devices, TMVs |
| LG044X | 30°C – 90°C (primary: 30–50°C) | Equal 1±0.15mm per band: 30–40°C, 40–45°C, 45–50°C; ≤4.5mm total | Uniform / linear — only model with equal stroke per band | TMVs requiring linear proportional response; anti-scald devices |
| LG0304 | 35°C – 100°C | Progressive: 1.25mm (35–45°C) → 2.1mm (45–55°C); ≤6.5mm total | Progressive accelerating; highest total stroke (standard platform) | High-travel TMV; applications requiring growing valve response with temperature |
| LGA253 | 38°C – 60°C | Active stroke with mid-range deceleration zone | With deceleration zone | Anti-scald TMVs; precise mid-range temperature control |
| LG0829 | 38°C – 58°C | Active stroke with deceleration zone | With deceleration zone | Thermostatic mixing valves, domestic hot water systems |
| LG0829A | 38°C – 58°C | Active stroke with deceleration zone (A variant) | With deceleration zone; alternate configuration | Thermostatic mixing valves, domestic hot water systems |
| LG5701 | 38°C – 55°C | Active stroke with deceleration zone | With deceleration zone | Thermostatic mixing valves, sanitary applications |
| LG0766 | ~40°C – 60°C | Stroke reduces after primary band | Tapering / decelerating after peak | Valves requiring controlled deceleration at elevated temperature |
| LG0766A | ~40°C – 60°C | Stroke reduces after primary band (A variant) | Tapering / decelerating; alternate configuration | Valves requiring controlled deceleration at elevated temperature |
| LG052X | ~45°C – 65°C | Peaks at mid-point then reduces | Bell curve; maximum opening at one defined temperature | Precision control requiring peak valve travel at a specific temperature |
| LG018X | 54°C – 58°C (primary); OEM range 24–113°C | Narrow 4°C primary band | Narrow high-temp band; widest OEM customization range | Anti-scald protection; Legionella-threshold hot water control |
| LG041X | 45°C – 60°C | 0.58mm (45–50°C) → 1.42mm (50–55°C) → 2.47mm (55–60°C) | Strongly accelerating — most aggressive profile in range | Anti-scald TMVs requiring decisive response as temperature rises toward 60°C |
High-Force Passive Elements (180N – 200N)
| Model | Activation Range | Key Stroke Data | Max Load | Typical Application |
|---|---|---|---|---|
| LG008X | 30°C – 90°C (primary: 40–60°C) | Three-stage: 40–50°C, 50–60°C, 30–90°C; ≤4.5mm total | 180N | Heavy valve assemblies; high-force HVAC applications |
| LG013X | 15°C – 90°C (primary: 45–60°C) | 2.15±0.25mm (45–60°C); <6mm total | 180N | Large TMVs, industrial flow control, heavy-duty HVAC |
| LGX069 | 50°C – 135°C (primary: 66–82°C) | ≤1.5mm (66–69°C) → 3mm (69–75°C) → 8.1mm (75–82°C); 16.5mm total max | 200N | High-temp mixing/safety valves; automotive; industrial; marine; military. Highest temp (135°C) and longest stroke (16.5mm) in range |
| LGX075 | 80°C – 99°C | 6±0.5mm between 90–99°C; rod-style body ~130mm | 200N | Boiler safety valves, high-temp HVAC, district heating; immersion rod body for deep installation |
Light-Duty Passive Elements (90N)
Designed for compact valve assemblies with low-resistance return springs (1N/mm spring rate).
| Model | Activation Range | Stroke Profile | Typical Application |
|---|---|---|---|
| LG036X | ~35°C – 55°C | Light-duty standard | Compact plumbing fixtures, small-format thermostatic devices |
| LG046X | ~35°C – 55°C | Light-duty standard | Compact thermostatic devices, low-force valve assemblies |
| LG065X | ~38°C – 58°C | With deceleration zone | Compact TMV assemblies; low-resistance valve mechanisms |
| LG068X | ~38°C – 60°C | With deceleration zone | Compact thermostatic mixing devices |
| LG071X | ~40°C – 60°C | With deceleration zone | Light-duty thermostatic plumbing assemblies |
| LG0874 | ~38°C – 56°C | Light-duty standard | Compact valve assemblies; low-spring-force mechanisms |
| LG0874A | ~38°C – 56°C | Light-duty; alternate configuration | Compact valve assemblies; alternate end-fitting specification |
Electrically-Heated Wax Elements
Activated by applied voltage rather than fluid temperature — for automated control systems, building management platforms, and timer-controlled valve assemblies. All models deliver full stroke within 6 minutes of power application, are rated for 30,000 actuation cycles, and are ACS and WRAS certified.
| Model | Voltage Options | Stroke | Max Working Temp | Key Differentiator |
|---|---|---|---|---|
| LGX7388 | 12V / 24V / 110V / 220V | 4.8mm | 60°C | Standard electrically-heated; widest voltage range |
| LGX2725 | 12V / 24V / 110V / 220V | 3.8mm | 90°C | Smaller stroke; higher max working temperature (90°C) |
| LGX066 | 24V / 110V / 220V | 12mm | 90°C | Largest stroke in electrically-heated range; 1N/mm spring rate |
All specifications are based on published product data. Each model has a full Temperature vs. Stroke curve in the individual product datasheet. Contact the Legom Technical Team to confirm exact specifications and select the correct model for your application.
How to Select the Right Wax Thermostatic Element
Every wax thermostatic element in the Legom range is engineered for a specific combination of activation temperature, stroke output, and load. Selecting the wrong model — even from a quality manufacturer — will result in a valve that does not control correctly. Before contacting the Legom team, confirm three parameters from your valve assembly design:
Required activation temperature range
At what temperature must the element begin to move, and at what temperature must it reach full stroke? This defines which model series is appropriate and whether a standard or custom wax compound formulation is needed.
Working stroke required
How many millimetres of piston travel does your valve mechanism need to move from fully closed to fully open? This must be matched against the element's published stroke data for the specific temperature band.
Maximum load the element must deliver
What is the stiffness of your valve's return spring? The element's max load must exceed the return spring force at full stroke. Legom offers three platforms: 90N, 140N, and 180N–200N.
Once you have these three values, the Legom engineering team can identify the correct standard model or initiate a custom development project if no standard model meets your specification. Contact us via WhatsApp or info@legomsmart.com.
Manufacturing Capacity
Legom's wax thermostatic element production facility is located in Jiaxing, Zhejiang Province, China — an established manufacturing hub with deep supply chains for precision copper, polymer, and specialty component inputs. The facility operates dedicated production lines for wax compound preparation, element assembly, and end-of-line quality inspection, enabling consistent high-volume output with batch-to-batch repeatability.
| Parameter | Detail |
|---|---|
| Production Location | Jiaxing, Zhejiang Province, China |
| MOQ | 1,000 units |
| Lead Time — Standard Models | Confirmed at order; contact the team for current scheduling |
| Lead Time — Custom / ODM | Project-based; agreed with the engineering team at specification stage |
| Primary Export Markets | Europe (primary); 90+ countries served globally |
| Shipping Methods | Sea freight / Air freight / Express courier |
| Quality Inspection | 100% stroke and temperature response testing on every unit before dispatch; batch test certificates available on request |
| Certifications | ACS, WRAS, CNAS, IAF, Eurofins |
| OEM Partners | 400+ globally |
The strength of Legom's position in the global thermostatic element market is demonstrated by measurable outcomes rather than claims: 400+ OEM partners across 90+ countries, ACS and WRAS certification obtained through independent European institutional testing, a patented wax formula that underpins the industry-leading sensitivity and cycle life of every model in the range, and a product catalogue spanning -5°C to 135°C — the widest activation temperature range available from a single wax element manufacturer. Legom elements are integrated into products sold into NHS-regulated healthcare facilities, ASSE1070-compliant point-of-use safety devices, and EN1111-certified solar thermostatic valves across European markets.
Production Process
7-Stage Production Process
Every wax thermostatic element leaving our Jiaxing facility has passed a structured 7-stage quality process — ensuring the consistency B2B buyers depend on at scale.
Wax Compounding
Proprietary paraffin blend distilled to precise carbon chain specification
Component Machining
Brass and SS housings machined to tolerance requirements
Wax Filling
Controlled-environment wax injection into sealed chamber
Assembly
Diaphragm, piston, and spring assembly under quality control
Calibration
Temperature-stroke calibration verified against target specification
Lifecycle Testing
Thermal cycle endurance test across full operating range
Certification Check
Final compliance verification for ACS, WRAS, and applicable standards
Each Legom wax thermostatic element is assembled through a controlled multi-stage production process at our Jiaxing facility. Raw copper bodies are machined to tight dimensional tolerances, cleaned, and inspected before wax filling. The proprietary wax compound — developed and formulated in-house — is introduced under controlled temperature conditions to ensure consistent density and activation characteristics across every batch. Each completed element is then tested individually for stroke output at the specified activation temperature before packaging and dispatch.
What Legom's OEM Service Covers
Legom's OEM and ODM service covers the full development and production cycle:
- ● Specification review — Legom's engineering team reviews your required activation temperature, working stroke, and maximum load against the standard catalogue. Where a standard model fits, samples can be dispatched promptly. Where no standard model meets the requirement, a custom development project is initiated.
- ● Custom wax compound formulation — The proprietary patented wax formula is adjusted to achieve the required activation temperature and stroke output. Minimum order quantities for custom formulations are discussed at the specification stage.
- ● Tooling and dimensional customization — Body length, end-fitting configuration, piston diameter, and other dimensional parameters can be modified to suit your valve assembly's internal geometry.
- ● Sample and approval cycle — Samples are produced and tested against your specification before production commitment. Third-party laboratory test reports can be arranged for regulatory submission or quality audits.
- ● Production batch certification — Stroke output and temperature response test certificates are available for every production batch.
- ● Confidentiality — All OEM and ODM projects are handled under strict confidentiality.
Applications
Legom wax thermostatic elements are used wherever precise, self-contained temperature sensing and mechanical actuation is required without electrical power. The electrically passive design — no power source, no software, no sensor failure modes — makes them a reliable and cost-effective solution in both high-volume consumer products and demanding industrial environments.
Thermostatic Faucets and Shower Valves
The most common application is in thermostatic faucet cartridges, shower valves, and bath/shower mixers. The element senses the mixed water temperature and automatically adjusts the hot-to-cold ratio to maintain the set temperature regardless of supply pressure or temperature fluctuations. Legom's LG003X, LG039X, LG044X, and LG016X/LG017X series are engineered for this application, covering the 22°C–60°C activation range with dimensional compatibility suited to thermostatic faucet cartridge assemblies.
Thermostatic Mixing Valves (TMVs) — Healthcare and Commercial
In healthcare facilities, care homes, schools, and public buildings, thermostatic mixing valves are mandatory under NHS D08 and equivalent standards to limit hot water outlet temperatures and prevent scalding. Legom's LG013X, LG016X/LG017X, LGA253, and LG0829 series are purpose-built for TMV applications, calibrated to the precise temperature ranges required by healthcare procurement specifications and compliant with ASSE 1016, ASSE 1070, ASSE 1071, and NHS D08.
Air Conditioning and HVAC Systems
In HVAC applications, wax thermostatic elements regulate the flow of heat transfer fluid within hydronic heating and cooling circuits, providing automatic zone balancing without electronic controls. Their durability under continuous thermal cycling — rated to 100,000 actuation cycles — makes them suited to systems operating year-round. See also Legom's range of HVAC valves and thermal actuators for complete hydronic system components.
Automotive Engine Cooling
Wax thermostatic elements are a fundamental component in automotive engine thermostats, regulating coolant flow between the engine block and radiator to maintain optimal operating temperature. Legom supplies custom-specification elements to automotive component manufacturers requiring precise activation temperatures and high actuating forces suited to engine coolant system pressures. The LGX069 — with 200N maximum load and 135°C rated temperature — is the primary model for heavy-duty automotive and engine applications.
Military and Specialist Shelters
Field shelters, mobile command units, and military-grade HVAC systems require temperature control components that perform reliably across extreme environmental conditions. Wax thermostatic elements are valued in these applications for their mechanical simplicity: no electronics, no power dependency, and no software failure modes. Legom's LG0304 and LG034X series are available to custom temperature set points and actuating force specifications for specialist defence and industrial procurement.
Shipping and Marine
Marine environments demand mechanical components that perform under saltwater exposure, constant vibration, and wide temperature ranges. Wax thermostatic elements are used in vessel cooling systems, engine temperature regulation, and sanitary hot water systems aboard ships and offshore platforms. Contact the Legom team for element specifications suited to marine corrosion resistance requirements.
Solar Thermal and Other Industrial Applications
Legom supplies elements for solar thermal systems (regulating collector circuit flow based on temperature differential), industrial process fluid control, freeze protection in outdoor pipework, and custom OEM applications across energy, chemical processing, and building services. The LG001X, LG002X, and LG005X series cover the low-temperature and wide-range applications most common in solar thermal and freeze protection installations.
Frequently Asked Questions
A wax thermostatic element is a precision temperature-sensing and actuating device that uses the volumetric expansion of a specially formulated wax compound to generate a mechanical stroke. As water temperature rises, the wax expands and pushes a piston outward, controlling the position of a mixing valve or shutter. When the temperature falls, the wax contracts and a return spring resets the piston. This self-contained, electrically passive mechanism requires no power source and forms the heart of most thermostatic faucets, shower valves, and thermostatic mixing valves in residential and commercial plumbing systems. For a detailed technical guide, read our article on complete information about wax thermostatic elements.
Legom is a manufacturer. Our wax thermostatic elements are produced at our own facility in Jiaxing, Zhejiang, China, using in-house proprietary wax compound preparation and dedicated assembly and testing lines. We do not source finished elements from third-party suppliers and resell them — every unit is produced and 100% tested at our facility before dispatch. Factory visits are welcome by appointment for clients who wish to audit the production process directly.
All standard Legom passive wax thermostatic elements are certified to ACS (French attestation de conformité sanitaire for drinking water contact) and WRAS (UK Water Regulations Advisory Scheme). Additional certification testing has been conducted by CNAS, IAF, and Eurofins accredited laboratories. ACS and WRAS certification requires independent laboratory testing — a qualification that the majority of Chinese wax thermostatic element manufacturers do not hold. Certification documents are available upon request for procurement and compliance purposes.
ACS is a French certification confirming that a material or component is suitable for contact with drinking water distributed to the public. WRAS is the equivalent UK certification scheme. Both evaluate whether harmful substances leach from the component into the water supply above safe thresholds. Legom elements are manufactured to comply with both standards, confirming suitability for drinking water contact applications in France, the UK, and a wider range of European markets — without requiring additional testing by the valve manufacturer.
Standard passive Legom wax thermostatic elements are rated for 100,000 actuation cycles, verified through dimensional stability testing at 30,000 and 100,000 cycle milestones. Electrically-heated models (LGX7388, LGX2725, LGX066) are rated for 30,000 cycles. In a typical residential thermostatic shower valve used twice daily, 100,000 cycles equates to approximately 137 years of operation — far exceeding the service life of the valve body itself.
Legom wax thermostatic elements carry a standard 12-month warranty from the date of shipment against manufacturing defects in materials and workmanship. Elements that fail to perform to specified stroke output or activation temperature under normal operating conditions within the warranty period will be replaced. Warranty claims must be accompanied by a sample return for inspection. Extended warranty terms can be discussed for long-term OEM supply agreements.
Legom ships worldwide from Jiaxing, Zhejiang, China via sea freight, air freight, or express courier. We support all major international shipping terms including EXW, FOB Ningbo, CIF, and DDP depending on client preference. Full export documentation — commercial invoice, packing list, certificate of origin, and production test reports — is provided with every shipment.
Samples of standard catalogue models can be requested by contacting the Legom team via WhatsApp or info@legomsmart.com. For custom ODM samples, lead time depends on the scope of wax compound calibration and tooling development required — this is agreed with the engineering team at the specification stage.
Yes. Custom temperature set points, stroke calibrations, and dimensional specifications are available for OEM and ODM clients. The wax compound blend and dimensional tolerances are adjusted to achieve the required activation temperature and mechanical output. MOQ for all orders — standard and custom — is 1,000 units. Contact the engineering team with your three key parameters: activation temperature range, working stroke, and maximum load.
Legom offers 36 standard catalogue models covering activation temperatures from -5°C to 135°C, maximum loads from 90N to 200N, and stroke profiles from uniform linear through strongly accelerating. Custom ODM elements can be developed where no standard model meets the required parameters.
Legom supplies wax thermostatic elements to OEM valve manufacturers globally. Many models are dimensionally compatible with standard bore sizes used by major valve brands. Direct compatibility depends on the specific valve model and dimensional requirements — share dimensional drawings or a sample valve body with the Legom technical team, and they will confirm compatibility or recommend the closest matching standard model.
Yes. Production batch test certificates confirming stroke output and temperature response testing results are available upon request for all standard and custom element orders. Third-party laboratory test reports can be arranged for clients requiring independent verification for regulatory submission or quality audits.
A passive wax thermostatic element responds to the temperature of the surrounding fluid — no electricity is required. The element opens and closes automatically based on the actual water or ambient temperature at the installation point. An electrically-heated element is activated by an applied voltage that heats the internal wax charge on command, regardless of fluid temperature. This makes electrically-heated elements suitable for integration into automated control systems, building management platforms, and timer-controlled applications where valve actuation must be commanded rather than triggered by ambient temperature alone.