Defrost Heating Elements for Refrigeration Evaporators (IP67 Waterproof)

Hongtai manufactures high-durability defrost heating elements designed to operate effectively in sub-zero environments inside commercial freezers, evaporators, and cold storage units. Unlike standard air heaters, these elements feature vulcanized waterproof seals at the terminals to prevent moisture ingress during freezing and thawing cycles.

Engineered for high reliability, we utilize high-quality Incoloy 840 or Stainless Steel 304 sheaths that resist corrosion from refrigerants and constant condensation.

Key Features:

• Waterproof Rating: IP67 (Vulcanized silicone or shrink-sealed ends).

• Sheath Material: Incoloy 840 (Anti-corrosion against freon/refrigerants) or SS304.

• Element Type: Double ended defrost heater or U-shape configurations.

• Cold Zone: Customizable unheated lengths to protect wiring connections.

• Voltage: 120V, 230V, 240V (Single Phase).

• Termination: Insulated lead wires with waterproof splicing.

SECTION 1: Technical Specifications & Dimensions

We offer standard replacement sizes for major evaporator brands and custom manufacturing for specific coil geometries.

Figure: Defrost Heater Configurations.

Common shapes include “Straight”, “U-Shape”, and complex “Manifold” bends to fit around evaporator coils. Waterproof seals ensure electrical safety in 100% humidity environments.

SECTION 2: Industrial Applications

• Commercial Refrigeration: Display cases, reach-in freezers, and walk-in coolers.

• Cold Storage Warehouses: Evaporator coil defrosting to prevent ice buildup.

• Heat Pumps: Crankcase heating and de-icing.

SECTION 3: Waterproof Sealing Technology

The failure point of most freezer defrost heater replacements is moisture entering the terminal. Hongtai utilizes a specialized hot-vulcanization process where the silicone lead wire is chemically bonded to the metal sheath end. This creates a hermetic seal that completely blocks water infiltration, significantly extending the service life compared to standard crimped connections.

SECTION 4: Why Choose Incoloy 840?

While SS304 is standard, Incoloy 840 is specifically developed for high oxidation resistance and is less susceptible to stress corrosion cracking caused by chloride ions and refrigerants often found in closed-loop cooling systems.

SECTION 5: FAQ

Q: Can I replace a broken glass defrost heater with a metal tubular one?

A: Yes. Metal tubular heaters for cold storage are more durable and shatterproof compared to glass tube heaters. We can design a metal replacement with the same wattage and length to fit your existing bracket.

Q: How do I determine the correct cold zone length?

A: The cold zone (unheated section) should extend past the evaporator coil fins and into the terminal box. This prevents the heat from melting the wire insulation or damaging the electrical connections.