Tubular Electric Heaters
Tubular electric heaters are what are commonly called "electric heating tubes/heating tubes" in industry. They are used to convert electrical energy into heat energy. Common forms include straight tubes, U-shaped, flange type, single-head heating rods, finned type, sheathed type, etc.
Medium Water, heat transfer oil, air, corrosive liquids, molds, etc. The medium determines the material and surface load
Material 304/copper for clean water; 316L/titanium for corrosive liquids; 304/321 for heat transfer oil Highly corrosive and high-temperature air require upgraded materials
Surface load Water 6–8 W/cm²; heat transfer oil 2–4 W/cm²; static air 1–3 W/cm²; oil tank recommended ≤0.7 W/cm² Excessively high surface load easily causes carbon buildup and tube burnout
Power and size Calculated according to medium mass, specific heat, and heating time, with a safety factor of about 1.2 added The heating zone must be fully immersed in the medium
Voltage and wiring 220V, 380V, or custom voltage Need to check distribution capacity, number of phases, and wiring method
Structural form Ordinary tubular, flange type, single-head rod, sheathed type, explosion-proof type Sheathed type is convenient for maintenance; explosion-proof occasions require explosion-proof certification
Safety indicators Insulation resistance, withstand voltage, grounding, over-temperature/dry-burn protection Cold insulation is usually ≥1MΩ; higher is recommended for important equipment
Common application scenarios
Oil tank/oil sump heating: SRY series, flange type, and sheathed type are more common; heat transfer oil requires control of surface load.
Water heating: Flange immersion type and threaded electric heating tubes are more suitable.
Air heating: Finned type or duct-matched tubular heaters are preferred.
Local heating of molds/equipment: Single-head heating rods are commonly used.
Corrosive media: Choose 316L, titanium tubes, or special coated tubes.
Local manufacturer direction
The area is a relatively concentrated region for the electric heating appliance industry, and there are many local enterprises making electric heating tubes, flange heating tubes, and sheathed heaters. Focus can be placed on these categories:
Products include flange electric heating tubes, immersion type, cluster type, radiant tubes, etc. The production base is in Baoying, Yangzhou.
Mainly engaged in electric heaters, heating tubes, boiler heating tubes, etc.
Involves electric heating tubes, electric heaters, heat treatment equipment, etc.
Produces electric heaters and related accessories.
Business scope includes engine heaters and electrical appliance sales.
Has tubular electric heater products such as SRY2 and SRY7.
Products cover electric heating tubes, fluid heaters, air heaters, etc.
Located in Baoying, making electric heating tubes, single- and double-head heating tubes, etc.
