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Screw Plug Immersion Heater Manufacturer
ELEKHEAT manufactures industrial screw plug immersion heaters, also known as screw in immersion heaters and threaded immersion heaters, for water tanks, oil systems, boilers, and industrial process heating applications.
Available with NPT, BSP threaded connections, SS304, SS316, and Incoloy materials, our heaters are customized for OEM equipment manufacturers and industrial heating projects.
Professional Screw Plug Immersion Heater Manufacturer
ELEKHEAT specializes in custom industrial heating elements and provides screw plug immersion heater solutions for equipment manufacturers, engineering companies, and industrial users worldwide.
30+
Years Experience
Professional heating element manufacturing experience since 1997.
48,00㎡
Production Area
Large-scale manufacturing facilities supporting OEM production.
100%
Testing Before Delivery
Electrical performance inspection for every heater.
OEM
Custom Solutions
Customized power, voltage, dimensions and materials.
What Is a Screw Plug Immersion Heater?
A screw plug immersion heater is an electric heating device that combines tubular heating elements with a threaded plug connection. The heater is installed directly into a threaded opening of a tank, vessel, or pipe to provide direct heat transfer into liquids.
Because of its compact threaded installation design, screw plug immersion heaters are widely used in small and medium-sized tanks where space saving, easy installation, and quick replacement are required.
Common Names:
Screw Plug Immersion Heater Types
ELEKHEAT provides different screw plug immersion heater designs according to installation standards, heating media, and industrial requirements.
Standard Screw Plug Immersion Heater
General-purpose threaded immersion heaters designed for water tanks, industrial equipment, and liquid heating systems.
Applications:
Water heating, storage tanks, OEM machines
NPT Screw Plug Immersion Heater
Designed with NPT threaded connections commonly used in North American industrial equipment.
Applications:
NPT immersion heater, NPT threaded heater
BSP Screw Plug Immersion Heater
BSP threaded immersion heaters designed for European and international industrial applications.
Applications:
BSP immersion heater, BSP threaded heater
Explosion Proof Screw Plug Heater
Designed for hazardous environments requiring additional protection and industrial safety requirements.
Applications:
Chemical plants, oil and gas systems
Custom Screw Plug Immersion Heater
OEM heating solutions customized according to power, voltage, dimensions, materials, and installation requirements.
Applications:
Industrial equipment integration
Screw Plug Immersion Heater Construction
ELEKHEAT provides different screw plug immersion heater designs according to installation standards, heating media, and industrial requirements.
TERMINAL COVER
PC or Bakelite terminal cover provides protection for electrical connections and ensures safety.
CERAMIC TERMINAL BLOCK
High temperature resistant ceramic terminal block for secure wiring and reliable electrical connection.
THREADED PLUG
Stainless steel screw plug with NPT / BSP /G thread for easy installation and removal.
MgO INSULATION
High purity magnesium oxide (MgO) powder offers excellent electrical insulation and thermal conductivity, ensuring efficient heat transfer and long service life.
SHEATH MATERIAL
Stainless steel SS304 / SS316 or Incoloy 800 /825 sheath for corrosion resistance and high-temperature performance.
Screw Plug Immersion Heater Technical Specifications
ELEKHEAT screw plug immersion heaters are available with different power ratings, voltages, thread sizes, and sheath materials to meet various industrial heating requirements.
| Parameter | Specification |
|---|---|
| Product Type | Screw Plug Immersion Heater / Threaded Immersion Heater |
| Power Range | 1kW – 50kW |
| Voltage | 110V – 690V |
| Heating Element Diameter | 8mm / 10mm / 12mm |
| Thread Standard | NPT / BSP / G Thread / Custom Thread |
| Thread Size | 1″, 1-1/4″, 1-1/2″, 2″, 2-1/2″ |
| Sheath Material | SS304 / SS316 / Incoloy 800 / Incoloy 825 |
| Insulation Material | High Purity MgO |
| Temperature Control | Thermostat / Thermocouple / RTD / PID Controller |
| Protection Grade | IP54 / IP65 Available |
| Heating Medium | Water / Oil / Chemical Liquid / Process Fluid |
Screw Plug Immersion Heater Thread Size Guide
Thread selection is an important factor when integrating a screw plug immersion heater into industrial equipment. ELEKHEAT supports common international thread standards.
NPT Thread Immersion Heater
NPT tapered pipe threads are widely used in North American industrial equipment, tanks, boilers, and process systems.
- 1 inch NPT
- 1-1/4 inch NPT
- 1-1/2 inch NPT
- 2 inch NPT
BSP Thread Immersion Heater
BSP threaded heaters are commonly used in European and international industrial applications where metric installation standards are required.
- BSPP thread
- G thread
- Custom thread options
Screw Plug Immersion Heater Material Selection Guide
Selecting the correct sheath material according to heating medium, temperature, and chemical environment improves heater reliability and service life.
SS304 Stainless Steel
Suitable for general water heating applications with good corrosion resistance and cost efficiency.
SS316 Stainless Steel
Improved corrosion resistance for pure water, chemical liquids, and demanding industrial environments.
Incoloy 800 / 825
Designed for high temperature applications and oil heating systems requiring excellent oxidation resistance.
| Heating Medium | Recommended Material | Reason |
|---|---|---|
| Water Heating | SS304 / SS316 | Good corrosion resistance and heat transfer |
| Pure Water | SS316 | Better resistance to corrosion and contamination |
| Thermal Oil | SS316 / Incoloy 800 | Suitable for higher temperature oil heating |
| Chemical Liquid | SS316 / Special Alloy | Improved chemical corrosion resistance |
| High Temperature Application | Incoloy 800 / 825 | Excellent oxidation resistance |
Screw Plug Immersion Heater Material Selection Guide
Selecting the correct sheath material according to heating medium, temperature, and chemical environment improves heater reliability and service life.
Water Tank Heating
Used for storage tanks, process water systems, cleaning equipment, and industrial water heating.
Oil Heating Systems
Provides stable heating for hydraulic oil, thermal oil, lubrication oil, and fuel oil applications.
Chemical Processing
Customized with corrosion-resistant materials for chemical tanks, plating equipment, and process vessels.
Industrial Boiler Heating
Compact threaded heating solutions for electric boilers and OEM heating equipment.
Screw Plug Immersion Heater vs Flange Immersion Heater
Both screw plug heaters and flange immersion heaters are widely used for industrial liquid heating. The correct choice depends on tank size, installation method, and heating requirements.
| Feature | Screw Plug Immersion Heater | Flange Immersion Heater |
|---|---|---|
| Installation | Threaded connection installation | Bolted flange installation |
| Tank Size | Small and medium tanks | Medium and large industrial vessels |
| Maintenance | Easy replacement through threaded port | Requires flange removal |
| Typical Application | Water tanks, oil systems, OEM equipment | Chemical tanks, storage vessels, process systems |
| Customization | Thread size, power, voltage, material | Flange size, element arrangement, material |
How to Select a Screw Plug Immersion Heater
Selecting the correct immersion heater requires consideration of heating medium, required temperature, tank volume, installation method, and available electrical power.
Step 1: Identify Heating Medium
Determine whether the heater will be used for water, oil, chemical liquid, or other industrial fluids.
Step 2: Calculate Required Power
Heating power depends on liquid weight, specific heat capacity, temperature difference, and heating time.
Step 3: Select Sheath Material
Choose SS304, SS316, or Incoloy according to corrosion resistance and operating temperature requirements.
Step 4: Confirm Thread Size
Select NPT, BSP, or customized thread according to equipment connection.
Screw Plug Immersion Heater Power Calculation
The required heating power can be calculated according to the following formula:
Heating Power Formula
P(kW)= [M × Cp × ΔT] ÷ [3600 × Time] × Safety Factor
- M = Liquid weight (kg)
- Cp = Specific heat capacity (kJ/kg·℃)
- ΔT = Temperature increase (℃)
- Time = Required heating time (hour)
- Safety Factor = Usually 1.2 – 1.5
Screw Plug Immersion Heater Installation Guide
1. Check Thread Connection
Confirm thread size and sealing requirements before installation.
2. Install Into Tank Port
Ensure heating elements are fully immersed before energizing.
3. Connect Electrical Supply
Follow voltage, wiring, and grounding requirements.
Screw Plug Immersion Heater Manufacturing Process
Every ELEKHEAT heater is manufactured through controlled production processes to ensure stable electrical performance and reliable operation.
Tube Forming
Heating tubes are shaped according to required dimensions.
MgO Filling
High purity magnesium oxide provides insulation and heat transfer.
Welding Assembly
Precision welding ensures mechanical reliability.
Electrical Testing
Resistance and insulation testing before shipment.
