Core Value
The Circular Double Loop Tubular Heating Element for Oven is an advanced electric heating solution specially designed to achieve balanced, 360-degree thermal distribution in circular and square oven cavities. By configuring two concentric heating loops into a single compact terminal assembly, this dual-ring element maximizes active heating surface area, eliminates central cold spots, and speeds up pre-heating cycles in commercial convection ovens, pizza deck ovens, bakery warming cabinets, and residential cooktops.
Manufactured using high-grade Ni80Cr20 resistance wire centered inside high-purity, micro-compacted Magnesium Oxide (MgO) powder, these elements deliver exceptional dielectric strength and rapid heat transfer. The sheath is available in 304 Stainless Steel, 316L Stainless Steel, or heat-resistant Incoloy 800/840, providing superior structural rigidity and oxidation resistance at continuous operating temperatures up to 750°C. BACKED BY EXTENSIVE HEATER MANUFACTURING EXPERIENCE and optimized for long thermal cycling life, every double loop element UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS to guarantee zero hot-spot deformation, strict watt-density accuracy, and high insulation safety.
- ✓ Concentric Double-Loop Geometry: Dual inner and outer heating rings distribute heat evenly across the entire oven cavity, preventing localized food scorching or uneven baking.
- ✓ High-Temperature Sheath Alloys: Choice of 304 SS, 316L SS, or Incoloy 800/840 for long-term oxidation resistance under intense air-heating conditions.
- ✓ Accelerated Pre-Heating: High surface watt density capability reduces oven heat-up times and improves energy efficiency during continuous baking operations.
- ✓ Custom Mounting Brackets: Welded support plates, crossbars, and mounting flanges tailored to fit OEM oven cavity bolt patterns precisely.
- ✓ Versatile Terminal Connections: Standard 6.3mm Faston push-on terminals, M4/M5 threaded studs, or ceramic terminal blocks for easy field replacement.
- ✓ Precision Bending & Annealing: CNC tube bending combined with controlled atmosphere bright annealing ensures stress-free bends and uniform sheath strength.
- ✓ Reliable Quality: Built to withstand frequent expansion and contraction during continuous daily baking cycles without sagging or warping.
- ✓ Quality Assured: UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS including high-voltage cold/hot hipo testing (1500V/1min), insulation resistance measurement, and 3D dimensional bending inspection.
Technical Specifications & Performance Data
| Parameter | Standard Value | Customizable Range | Notes |
| Operating Voltage | 220V / 230V / 240V | 110V, 120V, 380V, 415V | Single-phase or 3-phase multi-loop connections |
| Power Rating | 1200W / 2000W / 2500W | 800W to 4000W | Designed for optimal thermal balance |
| Sheath Material | 304 Stainless Steel | 316L SS, Incoloy 800 / 840 | Incoloy recommended for severe high-temp oven air heating |
| Tube Diameter (Ø) | Ø 6.5 mm / Ø 8.0 mm | Ø 6.25 mm to Ø 10.0 mm | Standard 6.5mm / 8.0mm ideal for quick thermal response |
| Outer Loop Diameter | Ø 180 mm / Ø 210 mm | Ø 140 mm to Ø 380 mm | Sized to match oven chamber dimensions |
| Inner Loop Diameter | Ø 110 mm / Ø 130 mm | Ø 80 mm to Ø 220 mm | Maintains proportional heat gap between inner/outer rings |
| Cold Section Length | 50 mm / 80 mm | Custom non-heating cold zones | Prevents overheating around terminal wiring seals |
| Max Sheath Temp | 650°C (1202°F) for 304 SS | Up to 800°C (1472°F) for Incoloy | Depends on sheath material and air velocity |
| Insulation Resistance |
≥ 500 MΩ(Cold)
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≥ 10 MΩ (Hot / Humid)
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High-purity compacted MgO core |
| Terminal Types | 6.3mm Male Faston / M4 Studs | M5 Studs, Threaded Bushings | High-temp nickel-plated brass or stainless terminals |
Industrial Applications & Solutions
- Commercial Pizza & Deck Ovens: Uniform bottom or top radiational heating for crispy dough crusts and even cheese melting.
- Convection & Air-Fry Ovens: Installed directly in front of circulation fans to deliver instant hot airflow across all baking racks.
- Residential Electric Ovens & Ranges: Replacement or OEM bake/broil double ring elements for built-in wall ovens and free-standing ranges.
- Bakery Proofing & Holding Cabinets: Controlled low-to-medium heat radiation to keep baked goods warm and fresh without drying out.
- Commercial Rotisseries & Food Warmers: Circular loop placement ensures continuous perimeter radiant heat around rotating meat spits.
High-Performance Oven Elements vs Standard Market Options
| Feature | Our Double Loop Elements | Standard Market Sensors/Heaters | Your Advantage |
| Ring Concentricity | CNC Precision Bended Loops | Manual / Inconsistent Bends | Maintains exact distance between rings, eliminating uneven hot zones. |
| MgO Compaction | High-Density Hydraulic Swaging | Standard Vibration Fill | Maximizes heat transfer speed and prevents internal wire hot-spot burnouts. |
| Terminal Sealing | High-Temp Ceramic & Silicone | Basic Epoxy or Unsealed | Resists moisture ingress during oven cool-down, preventing electrical tripping. |
| Sheath Heat Treatment | Bright Annealed Sheath | Raw / Un-annealed Tubing | Relieves internal tube stress so the element won’t warp or bow when red-hot. |
| Quality Assurance | MULTIPLE RIGOROUS QUALITY CHECKS | Basic resistance check only | ZERO DEFECT DELIVERY, ensuring seamless drop-in assembly for OEM factories. |
Installation & Handling Guidelines
- Electrical Power Safety: Always disconnect main power prior to installation or servicing. Ensure supply voltage matches the rating stamped on the element cold leg.
- Support Bracket Fixation: Fasten all welded mounting brackets or support crossbars securely to the oven back/bottom wall to prevent element vibration and cantilever sagging.
- Terminal Clearance: Ensure at least 25mm of clearance between uninsulated live terminal connections and the metal oven body or insulation layer.
- Initial Burn-In Cycle: During first-time startup, operate the oven at 200°C for 20–30 minutes in a well-ventilated area to burn off trace manufacturing oils and cure the terminal seal.
- Handling Caution: Avoid dropping or applying heavy bending forces directly to the terminal pins. Use two wrenches when tightening threaded nuts on M4/M5 stud terminals to prevent twisting the internal lead pin.
Customer Success Stories
Case 1:
Commercial Bakery Equipment OEM (Italy)
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Application: Top heating zones in multi-deck artisan bread and pizza ovens.
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Challenge: Straight and single-U elements were causing cold spots in the middle of baking decks, resulting in pale pizza centers.
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Solution: Custom Incoloy 800 Circular Double Loop Elements (220V 2200W, Ø 220mm outer ring) with integrated center crossbar support.
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Results: PERFECT BAKING CONSISTENCY. “The double ring geometry completely eliminated central cold zones. Pizza crusts now bake uniformly across the entire stone deck in under 3 minutes.”
Case 2:
Kitchen Appliance Replacement Parts Distributor (Germany)
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Application: Aftermarket replacement elements for household convection and fan-assisted ovens.
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Challenge: Previous supplier elements suffered high return rates due to sheath oxidation cracking and terminal moisture short-circuits during storage.
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Solution: 304 SS Double Loop Oven Elements featuring bright annealing and high-temperature ceramic-silicone dual terminal seals.
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Results: CUSTOMER RETURNS DROPPED TO NEAR ZERO. “The sheath finish and terminal moisture sealing are outstanding. Storage shelf-life is no longer an issue, and customer feedback has been flawless.”
Pricing & Procurement Options
- Standard Production: Low MOQ available for popular replacement shapes (e.g., Ø 190mm and Ø 210mm double ring elements). Tiered volume discounts for OEM appliance manufacturers and commercial kitchen parts suppliers.
- Lead Times: Standard Catalog Models (220V 1500W–2500W): In stock, 3–5 days. Custom ring diameters, specialized wattage distribution, or unique mounting brackets: 7–12 days.
- Global Logistics: Carefully packed with protective foam ring supports inside heavy-duty 5-ply export cartons to prevent bending or terminal damage during transit.
- Sample Orders: Custom samples available for engineering testing upon approval of technical drawings. Every unit UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS prior to dispatch.
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
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- Warranty: 1-Year Comprehensive Warranty covering internal heating element and built-in sensor.
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Technical Support: Application engineers available for wattage distribution calculation, thermocouple calibration, and nozzle fitting assistance.
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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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