Core Value

In commercial refrigeration and cold chain logistics, frost accumulation on evaporator coils acts as a severe thermal insulator, choking airflow, forcing compressors to work overtime, and risking catastrophic temperature spikes inside frozen storage rooms. During automated defrost cycles, the heating element transitions rapidly from -30°C deep-freeze conditions to elevated surface temperatures, subjecting the unit to intense thermal shock and drenching meltwater runoff.

Standard tubular heaters with unsealed ceramic end beads fail rapidly in refrigeration environments because capillary action draws condensation deep into the hygroscopic magnesium oxide (MgO) core, causing immediate dielectric breakdown and tripping Ground Fault Circuit Interrupters (GFCIs).

The 220V Waterproof Defrost Tubular Heater For Freezer solves this failure mode through vulcanized hermetic end sealing. After the Ni80Cr20 resistance coil is compacted inside high-purity MgO within a seamless SUS304 or SUS316L stainless steel sheath, the terminal junctions are encapsulated inside molded black waterproof elastomer boots seamlessly bonded to the metal tube and the insulated lead wires. This creates an IP67/IP68 moisture barrier capable of withstanding continuous sub-zero condensation, high-humidity washdowns, and direct meltwater immersion.

Engineered with a calibrated low-to-medium watt density, the U-shaped tubular profile provides gentle, radiant, and convective warmth across evaporator fin packs—melting ice cleanly into the drain pan without overheating surrounding aluminum fins or warping plastic fan shrouds.

• ✓ Hermetic IP67/IP68 Waterproof End Seals: Vulcanized black elastomer terminal boots permanently seal the tube-to-wire junction, completely eliminating moisture ingress and GFCI tripping.
• ✓ Freeze-Thaw Thermal Shock Resistance: High-compaction MgO insulation and seamless stainless steel sheaths withstand thousands of rapid transitions from 40°C to +150°C..
• ✓ Corrosion-Proof Stainless Steel Sheath: Constructed from SUS304 or SUS316L to resist rust, acidic condensate, and commercial food-grade sanitizing agents.
• ✓ Precision CNC Tube Bending: Custom U-shaped, W-shaped, and offset terminal bends engineered to drop directly into existing evaporator coil slots and drain pans.
• ✓ Calibrated Low Watt Density: Delivers controlled heat output that melts ice uniformly without scorching evaporator fins or vaporizing refrigerant oil.
• ✓ Direct OEM Supply: Custom center-to-center widths, insertion lengths, wattages, and waterproof lead lengths manufactured to scale by HT HEATER.

Technical Specifications & Performance Data

Industrial Applications & Solutions

HT Heater Advantage: Why Choose Our Defrost Heater?

Installation & Handling Guidelines

• Evaporator Slot Alignment: Slide the U-shaped tubular heater smoothly into the designated evaporator fin slots or retaining clips. Ensure the heated active zone makes firm contact with the aluminum fins without bending or crushing them.

• Protect Molded Boots from Mechanical Pinching: Route the waterproof black terminal boots and lead wires cleanly away from sharp sheet-metal edges and fan blades. Never clamp directly over the molded rubber boot with sharp metal fasteners.

• Mandatory Defrost Termination Thermostat: Always wire the defrost heater in series with a defrost termination limit switch (Klixon/bimetal thermostat) clamped to the evaporator coil. This automatically cuts 220V power once the ice has melted (typically around +10°C to +15°C), preventing dry overheating.

• Routine Drain & Seal Inspection: During scheduled cold-room maintenance, clear debris from the drain pan and inspect the waterproof end boots for physical abrasion to ensure continued IP67 protection.

Customer Success Stories

Case 1:

Commercial Walk-In Cold Storage OEM (Netherlands)

• Application: Evaporator defrost assemblies for modular walk-in blast freezers operating at -28°C.

• Challenge: Competitor defrost heaters using standard heat-shrink end caps suffered moisture intrusion after 6 to 8 months of daily defrost cycles, tripping breaker panels and causing costly cold-room temperature alarms.

• Solution: Partnered with HT HEATER to standardize on 220V Waterproof Defrost Tubular Heating Elements engineered with vulcanized molded black rubber terminal boots and SUS304 sheaths.

• Results: ZERO MOISTURE-RELATED GROUND FAULTS. Following water-immersion dielectric validation, the heaters operated through more than 3,500 freeze-thaw cycles without a single electrical leakage failure.

Case 2:

Supermarket Refrigeration Equipment Manufacturer (Australia)

• Application: Multi-deck frozen food display cabinets requiring custom-bent U-shape and drain-pan defrost heaters.

• Challenge: Inconsistent tube bending tolerances from their previous vendor forced assembly technicians to manually bend heaters on the production line, damaging internal insulation and slowing assembly throughput.

• Solution: HT Heater supplied CNC-bent 220V waterproof defrost elements tailored to exact CAD slot dimensions with pre-angled waterproof lead exits.

• Results: ASSEMBLY TIME REDUCED BY 30%. Every element dropped effortlessly into the evaporator coil slots right out of the box, improving thermal defrost efficiency and cutting factory labor costs.

Pricing & Procurement Options

• OEM Customization: Tailored shapes, custom cutout holes for pipe nozzles, specialized voltage/wattage configurations, and custom strap lengths.
• Lead Times: Custom samples: 3–5 working days. Bulk production orders: 8–12 working days upon technical drawing sign-off.
• Packaging & Shipping: Individually bagged with protective foam padding and packed into heavy-duty 5-ply export cartons to prevent bending or lead wire stress during international transit.
• Minimum Order Quantity (MOQ): Low MOQ starting at 5–10 units for custom dimensions; competitive volume pricing tiers for equipment manufacturers.

Global Certifications & Compliance

• CE Marking
  Fully compliant with European safety and environmental standards.
• LVD Compliance
  Low Voltage Directive tested for continuous thermal load safety.
• RoHS Compliant
  Constructed using environmentally safe, lead-controlled brass alloys.
• ISO 9001
  Certified quality control covering CNC machining, coil pressing, and electrical testing.

Quality Documentation: Certificate of Conformity (COC) and insulation resistance test reports included.

Comprehensive After-Sales Support

• • Warranty: 1-Year Comprehensive Warranty covering internal heating element and built-in sensor.

  • Technical Support: Application engineers available for wattage distribution calculation, thermocouple calibration, and nozzle fitting assistance.

  • Global Response Network: BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE with technical inquiry feedback within 2 hours.

Ready to Optimize Your Injection Molding?

Next Steps:

• 📧 Request Custom Quote – Send your nozzle dimensions, wattage, voltage, and HT-CLW-450 drawing requirements.
• 🔧 Free Design Consultation – Work with our thermal engineers to optimize heat distribution and lead insulation.
• 📦 Order Test Samples – Evaluate thermal performance on your injection molding machine.
• 📞 Contact Hot Runner Experts – Response within 2 hours

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