Key Points

In the field of industrial heating, electric heating tubes (such as cartridge heaters and flange heaters) are widely regarded as the “heart” of the equipment. However, many purchasers focus only on price during the

selection process, neglecting environmental compatibility. By 2026, with rising demands for industrial energy efficiency, the selection logic will have undergone significant changes.

 

Precise Matching of Material and Medium

Water Heating: Ordinary stainless steel 304 is gradually being replaced by 316L or special anti-scaling coated tubes to cope with increasingly complex industrial water conditions and to reduce the risk of tube rupture

caused by scale adhesion.

 

Oil Heating:

Strict control of surface load is required. Since the heat transfer efficiency of oil is lower than that of water, excessive power density can lead to coking of the surface oil film, carbon deposit formation, and eventual

burnout of the heating tube.

 

Corrosive Chemical Liquids

PTFE (Teflon) and titanium electric heating tubes have become the standard configuration for heating acid and alkali baths.

 

Power Density – The Key to Service Life

Generally, the surface load for air heating should not exceed 1–2 W/cm², while higher values are permissible for liquid heating. The latest simulation software in 2026 can model the heat distribution within the flow

channel. By employing non-uniform power distribution technology, the problem of overheating at the far end of long heating tubes has been effectively resolved.

 

Insulation and Sealing Performance

Industrial electric heaters are prone to current leakage in humid environments. Current high-performance silicone encapsulation technology, combined with modified magnesium oxide powder, enables insulation

resistance to remain above 1000 MΩ even at high temperatures of 200 °C.