Screw Plug Heater - Image 1 - Industrial Heating Element by Subhot Enterprises
Screw Plug Heater - Image 2 - Industrial Heating Element by Subhot Enterprises
Screw Plug Heater - Image 3 - Industrial Heating Element by Subhot Enterprises
Screw Plug Heater - Image 4 - Industrial Heating Element by Subhot Enterprises
Screw Plug Heater - Image 5 - Industrial Heating Element by Subhot Enterprises
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Key Features & Benefits

High watt density up to 100 W/in² for intensive heating
Universal NPT/BSP thread installation (½″ to 4″)
Replaceable elements without tank drainage

Screw Plug Heater

Process Heaters Made in India ISO 9001:2015

Screw Plug Heaters represent advanced compact immersion heating technology featuring precision-engineered hairpin tubular heating elements permanently welded or brazed into NPT/BSP threaded hex plugs for direct installation in tanks, vessels, and process systems. These sophisticated heating solutions are specifically designed for efficient direct immersion heating of oils, water, chemicals, and diverse process fluids where space constraints and installation simplicity are critical requirements.

Manufactured using premium-grade heating elements constructed from high-temperature NiCr or FeCrAl alloy coils encased in precision-drawn stainless steel or Inconel sheaths with compacted MgO insulation, ensuring exceptional heat transfer efficiency and long-term operational reliability. The threaded plug assembly utilizes carbon steel, stainless steel 304/316, brass, or specialized Incoloy materials selected for optimal chemical compatibility and mechanical strength in demanding process environments.

Available in comprehensive single- and dual-element configurations, these versatile heating solutions offer rapid heat-up characteristics, consistent thermal performance, and simplified maintenance procedures enabling element replacement without complete tank drainage. The compact design optimizes installation flexibility while delivering superior heating performance with watt densities up to 100 W/in² for intensive heating applications requiring maximum thermal output.

Advanced engineering features include precision NPT/BSP thread configurations from ½″ to 4″ for universal fitting compatibility, high-temperature gasket sealing systems using PTFE, graphite, or Viton materials for leak-proof operation, and IP65/67-rated terminal enclosures with ceramic terminal blocks ensuring secure electrical connections and environmental protection in harsh industrial conditions.

These energy-efficient heating solutions incorporate optional integrated temperature control systems including adjustable thermostats, over-temperature protection sensors, dual-element switching capabilities, and explosion-proof certifications for hazardous area installations. The modular design philosophy ensures easy maintenance, rapid element replacement, and comprehensive compatibility with existing tank and vessel installations across diverse industrial applications requiring reliable, efficient, and cost-effective immersion heating solutions.

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Technical Details

Components of Screw Plug Heater

Precision Hairpin Heating Element

High-performance NiCr or FeCrAl tubular coils with compacted MgO insulation in precision-drawn stainless steel or Inconel sheaths for efficient heat transfer and superior electrical isolation.

Engineered Threaded Plug Assembly

Precision-machined carbon steel, SS304/316, brass, or Incoloy hex plug with NPT/BSP threads providing leak-tight mounting and superior mechanical strength.

Professional Terminal Enclosure

IP65/67-rated weatherproof housing with high-temperature ceramic terminal block, cable gland, and optional integrated control systems for secure wiring and environmental protection.

Advanced Sealing System

High-performance PTFE, graphite, or Viton gaskets engineered for chemical resistance, temperature cycling, and leak prevention in demanding process applications.

Precision Element Mounting Collar

Engineered locknut and support assembly ensuring stable vertical or angled immersion positioning without element movement or mechanical stress.

Technical Specifications

Detailed technical specifications for Screw Plug Heater with industry-leading performance standards

Product Specifications

Complete technical details and performance parameters

Parameter Specification
Heating Element Materials
Primary specification
High-grade NiCr and FeCrAl alloy tubular coils
Premium quality
Sheath Construction
SS304/316/316L, Incoloy 800/825, Inconel, Copper
Plug Materials
Carbon Steel, SS304/316, Brass, Incoloy (zinc plated)
Premium quality
Thread Configurations
NPT and BSP threads from ½″ to 4″
Power Range
0.5 kW to 25 kW (single and three-phase)
Voltage Options
110V, 230V, 415V, 480V (single and three-phase)
Watt Density
Up to 100 W/in² (application optimized)
Maximum Operating Temperature
400°C (750°F) continuous operation
High performance
Element Length Range
50mm to 3000mm immersion depth
Insulation Type
Compacted high-purity MgO powder
Terminal Rating
IP65/IP67 weatherproof and explosion-proof options
Control Integration
Built-in thermostat, over-temp sensing, dual-element switching
Gasket Materials
PTFE, Graphite, Viton (application specific)
Premium quality
Certifications Available
ATEX, PESO, IECEx, UL (hazardous area approved)
All specifications are subject to customization based on application requirements.
ISO 9001:2015 CE Marked RoHS Compliant

Industrial Applications

Discover how Screw Plug Heater delivers superior performance across diverse industrial sectors

Popular

Industrial water and oil heating tanks

Superior performance
Proven reliability
50+ successful installations
Popular

Chemical process vessels and reactors

Corrosion resistant
Safety certified
67+ successful installations
Popular

Steam generation and boiler systems

Superior performance
Proven reliability
84+ successful installations

Lubrication oil conditioning systems

Superior performance
Proven reliability
101+ successful installations

Food and beverage processing equipment

Hygienic design
Temperature accuracy
118+ successful installations

Pharmaceutical manufacturing vessels

Superior performance
Proven reliability
135+ successful installations

Grease and solvent heating applications

Superior performance
Proven reliability
152+ successful installations

Hydraulic fluid and oil reservoir heating

Superior performance
Proven reliability
169+ successful installations

Power plant auxiliary heating systems

Superior performance
Proven reliability
186+ successful installations

HVAC and building services equipment

Superior performance
Proven reliability
203+ successful installations

Automotive and aerospace component heating

Reliable performance
Quality consistency
220+ successful installations

Marine and offshore platform heating systems

Superior performance
Proven reliability
237+ successful installations

Laboratory and research equipment heating

Superior performance
Proven reliability
254+ successful installations

Petrochemical and refinery process heating

Corrosion resistant
Safety certified
271+ successful installations

Trusted Across Industries

From automotive giants to pharmaceutical leaders, industries across India trust Subhot for their heating solutions

Steel & Metal

Automotive

Chemical

Food & Beverage

Pharmaceutical

Research Labs

Key Features & Benefits

Experience the superior features that make Screw Plug Heater the preferred choice for industrial heating

Direct immersion heating for maximum thermal efficiency

High efficiency design reduces energy costs.

Replaceable heating elements without complete tank drainage

Quality engineering for reliable performance.

Comprehensive alloy selection for diverse chemical compatibility

Quality engineering for reliable performance.

Optional explosion-proof and flameproof certifications available

Quality engineering for reliable performance.

Rapid thermal response with uniform heat distribution

Quality engineering for reliable performance.

Compact design optimizing installation space requirements

Quality engineering for reliable performance.

Low maintenance requirements with extended operational life

Low maintenance with easy access components.

Integrated temperature control and safety protection systems

Precise temperature control for consistent results.

Universal NPT/BSP threading for worldwide compatibility

Quality engineering for reliable performance.

Custom power ratings and voltage configurations available

Quality engineering for reliable performance.

Advanced sealing systems preventing leakage and contamination

Quality engineering for reliable performance.

Professional terminal enclosures with IP65/67 protection

Quality engineering for reliable performance.

Comprehensive technical support and application engineering

Quality engineering for reliable performance.

Cost-effective heating solution with superior energy efficiency

High efficiency design reduces energy costs.

Frequently Asked Questions

A Screw Plug Heater is a compact immersion heating device featuring high-performance tubular elements permanently welded into a threaded hex plug designed to be screwed directly into tank or pipe openings for efficient direct heating of liquids including water, oil, chemicals, and process fluids. The integrated design eliminates external mounting hardware while providing superior heat transfer efficiency and simplified installation.
Screw Plug Heaters are extensively used in industrial storage tanks, pressure vessels, oil reservoirs, chemical processing baths, process water heating systems, lube oil conditioning, hydraulic systems, food and beverage equipment, and machinery pre-heating applications across industries including manufacturing, chemical processing, oil and gas, food production, and power generation.
Standard configurations include ½″, ¾″, 1″, 1¼″, 1½″, 2″, 2½″, 3″, and 4″ NPT or BSP threaded plugs with custom thread specifications available for unique applications. The precision-machined hex plug design ensures proper torque application and leak-tight sealing while accommodating diverse tank and vessel port configurations.
Screw Plug Heaters are available in comprehensive voltage options including 110V, 230V, 415V, and 480V in single-phase and three-phase configurations with power ratings ranging from 0.5 kW to 25 kW depending on heating requirements, tank size, fluid volume, and thermal demand specifications.
Heating element sheaths are manufactured from SS304 (general applications), SS316/316L (corrosive environments), Incoloy 800/825 (high-temperature chemical resistance), Inconel (extreme temperature oxidizing conditions), and copper (water heating applications) selected based on chemical compatibility, operating temperature, and specific process fluid characteristics.
Yes, Screw Plug Heaters are ideally suited for transformer oil heating, lube oil reservoirs, gear oil conditioning, hydraulic fluid heating, and fuel oil systems with appropriate watt density selection, specialized sheath materials, and optional explosion-proof certifications ensuring safe and efficient heating performance in petroleum and hydrocarbon applications.
Yes, we offer integrated solutions including built-in adjustable thermostats, RTD temperature sensors, thermowells for external sensors, over-temperature protection devices, and dual-element control systems providing precise temperature regulation, safety protection, and automated heating control for demanding process applications.
Yes, Screw Plug Heaters are specifically engineered for pressurized applications when installed with proper thread sealing compounds, high-pressure rated gaskets, and pressure-compatible fittings. The robust plug design and precision threading ensure leak-tight performance in high-pressure vessels, steam systems, and process equipment.
Installation involves threading the heater directly into the tank port using proper torque specifications with high-temperature thread sealant or PTFE tape. Professional installation includes gasket sealing, proper electrical connections, and thermal expansion accommodation ensuring leak-proof operation and optimal thermal performance.
Screw Plug Heaters can operate continuously at temperatures up to 400°C (750°F) depending on sheath material selection, fluid type, and specific application requirements. Specialized high-temperature alloy constructions enable operation at even higher temperatures for demanding process heating applications.
Terminal options include weatherproof IP65/67 enclosures, stainless steel terminal boxes, explosion-proof ATEX/PESO certified housings, and flameproof enclosures for hazardous area installations. Connection methods include screw terminals, cable glands, conduit entries, and integrated connector systems for diverse installation requirements.
Yes, we manufacture ATEX, PESO, IECEx, and UL certified explosion-proof Screw Plug Heaters specifically engineered for Zone 1, Zone 2, Division 1, and Division 2 hazardous locations in chemical, petrochemical, pharmaceutical, and oil and gas applications where explosive atmospheres may be present.
Screw Plug Heaters offer compact threading installation for small to medium tanks with power ratings up to 25 kW, while flanged heaters provide bolt-on mounting for large vessels with high-power capabilities exceeding 100 kW. Screw plug designs offer installation simplicity while flanged versions provide higher power density and easier maintenance access.
Screw Plug Heaters provide superior energy efficiency through direct immersion heating with minimal heat loss, rapid thermal response, and targeted heat delivery. Efficiency typically ranges from 85-95% compared to 60-75% for external heating methods resulting in reduced energy consumption, faster heat-up times, and lower operational costs.
Yes, Subhot offers complete integrated packages including adjustable thermostats, digital temperature controllers, pilot indicator lamps, contactor panels, and temperature monitoring systems providing turnkey heating solutions with comprehensive temperature control and visual operation indication for automated process control applications.

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With proper sizing, correct installation, and appropriate maintenance, Subhot Screw Plug Heaters deliver 10,000 to 15,000 hours of reliable continuous operation. Premium construction materials, precision manufacturing, and quality control processes ensure extended service life, reduced downtime, and consistent heating performance.
Key industries include oil and gas processing, chemical and petrochemical manufacturing, food and beverage production, pharmaceutical processing, power generation, water treatment, HVAC systems, and machinery manufacturing where reliable immersion heating, compact installation, and efficient thermal performance are essential requirements.
Yes, all Screw Plug Heaters are designed, manufactured, and quality tested at our advanced Ghaziabad manufacturing facility using international quality standards, premium materials, and rigorous testing protocols ensuring export-quality performance, reliability, and comprehensive technical support for domestic and international markets.
Contact our technical sales team at +91-9999710410 or email sales@subhotheaters.com with your specific requirements including tank dimensions, fluid type, operating temperature range, voltage preferences, thread size, and environmental conditions. Our application engineers provide comprehensive technical consultation, custom design services, and competitive pricing for your heating requirements.

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