Core Value

In commercial catering appliances, medical autoclaves, and ultrasonic cleaning tanks, engineers are constantly fighting for space. Providing enough wattage to rapidly boil water or heat chemical solutions typically requires a very long heating element. However, long straight rods simply do not fit inside compact equipment.

The Industrial 220V Double U Tubular Immersion Heater solves this geometric challenge elegantly. By folding the tubular sheath back on itself (creating the overlapping Double U profile seen in image_5a9e9d.png), HT Heater engineers have effectively doubled the active heat-transfer surface area within the exact same immersion depth.

This expanded surface area is critical for fluid dynamics. It lowers the overall watt density (surface load) of the heater. In hard-water applications, a low watt density dramatically reduces the rate at which calcium and magnesium scale bake onto the heater sheath, extending the element’s lifespan and maintaining its thermal efficiency over years of heavy commercial use.

To guarantee zero leaks, the heater is outfitted with heavy-duty threaded bulkhead fittings. These fittings are deep-welded or silver-brazed directly to the stainless steel sheath. When passed through the wall of a tank and tightened down with the included red silicone gaskets and steel locknuts, they create a pressure-tight, mechanical seal that will not degrade under the constant thermal expansion and contraction of boiling liquids.

• ✓ Maximized Power-to-Size Ratio: The folded Double U profile delivers high commercial wattage (e.g., 2kW to 5kW) in incredibly short tank depths.
• ✓ Leak-Proof Threaded Mounting: CNC-machined threads paired with high-temperature silicone washers provide a permanent, watertight seal through the vessel wall.
• ✓ Anti-Scaling Watt Density: The expanded surface area distributes heat gently, preventing rapid mineral calcification in hard-water environments.
• ✓ Secure Electrical Terminals: Heavy-duty threaded studs with ceramic insulators provide a rock-solid, vibration-proof connection for electrical ring terminals.
• ✓ Direct OEM Manufacturing: Fully customizable immersion lengths, voltages (220V standard), and thread sizes supplied directly by HT HEATER.

Technical Specifications & Performance Data

Industrial Applications & Solutions

This compact, high-efficiency threaded immersion heater is the ideal thermal engine for confined liquid heating:

• Commercial Coffee & Espresso Machines: Fits perfectly into small internal boiler tanks, providing the rapid heat recovery needed for continuous brewing.

• Medical & Dental Autoclaves: Delivers reliable, high-pressure water boiling to generate sterilization steam in compact medical equipment.

• Ultrasonic Cleaning Vats: Warms aqueous degreasing solutions; the heavy-duty brazed fittings easily withstand the high-frequency vibration of ultrasonic transducers.

• Commercial Dishwashers & Glasswashers: Installed in the sump basins of under-counter washing equipment to maintain critical 82°C sanitizing temperatures.

• Distillation & Laboratory Water Baths: Provides highly stable, controllable heat for scientific fluid processing.

Hongtai Heater Factory Advantage: Why Choose Our Immersion Elements?

Installation & Handling Guidelines

• Mandatory Complete Submergence: The active heating length of the Double U Tubular Immersion Heater must be completely submerged in liquid at all times. Dry-firing in open air will cause the element to glow red-hot and destroy itself within minutes. Always utilize a liquid level sensor or float switch in your equipment.
• Proper Washer Sealing: Position the red silicone sealing washer on the inside of the tank wall (between the tank interior and the heater’s fixed flange). Pass the threaded fitting through the hole, and firmly tighten the locknut on the outside of the tank.
• Secure Electrical Connections: When attaching ring terminals to the threaded electrical studs, use two wrenches: one to hold the bottom nut stationary, and one to tighten the top nut. Twisting the terminal stud can snap the internal resistance wire.
• Routine Descaling Schedule: In commercial water heating, mineral scale will eventually form on the sheath. Establish a routine maintenance schedule to descale the element using a commercial citric acid or vinegar solution to prevent thermal insulation and burnout.

Customer Success Stories

Case 1:

Commercial Espresso Machine OEM (Italy)

• Application: 5-liter internal copper boilers for 3-group professional espresso machines.

• Challenge: The OEM needed a 3500W heater for rapid steam recovery, but a standard straight element was too long for the compact boiler. Previous single-U heaters they tested had too high a watt density, causing calcium scale to build up rapidly and ruin the heating efficiency within 6 months.

• Solution: Partnered with HT HEATER to integrate the 220V Double U Tubular Immersion Heater. The folded design perfectly accommodated the 3500W requirement within the short boiler depth, while drastically lowering the surface load.

• Results: SCALE BUILDUP REDUCED BY 60%. The lower watt density preserved the heater’s efficiency, significantly extending the maintenance intervals for the cafes and reducing OEM warranty replacements.

Case 2:

Ultrasonic Cleaner Manufacturer (USA)

• Application: 30-liter stainless steel ultrasonic parts cleaning tanks for automotive shops.

• Challenge: The intense high-frequency vibration of the ultrasonic transducers was causing the epoxy seals on generic heater fittings to crack, leaking corrosive cleaning fluid into the electronics bay.

• Solution: Upgraded to HT Heater’s elements featuring deep, 360-degree silver-brazed threaded bulkhead fittings and high-temperature silicone sealing washers.

• Results: ZERO LEAKS UNDER VIBRATION. The mechanical strength of the silver-brazed joints completely withstood the ultrasonic cavitation forces, providing a 100% leak-proof solution for continuous industrial use.

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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