Flanged Electric Heaters

REART manufactures flanged electric heaters for low-energy consumption heating of liquids and gases in various sectors, including residential, industrial, and plant engineering applications.

Flanged heaters are specifically designed to securely attach the electric heater (electric convectors, low-energy electric heaters, low-energy electric heating systems, and low-energy electric radiators) to the heating process using a connection flange. These flanges are manufactured according to UNI or ANSI 16.5 standards and can also be customized upon request to meet specific requirements.

These electric heaters are suitable for heating non-corrosive process fluids. They consist of one or more U-shaped or looped electric heating elements, welded to the main flange using TIG welding or brazing. Each heater is equipped with electrical connections, safety features, and a protective enclosure for the electrical connections.

All heating elements welded on the main flange of the heater undergo hydraulic testing to verify their pressure resistance, according to the client’s project specifications.

The hydraulic test performed by Reart on welded electric heaters guarantees the tightness of the welds of the heating elements to the flange. This verification is certified in the final test report, which is issued along with the product by REART

APPLICATIONS OF FLANGED ELECTRIC HEATERS

Flanged electric heaters are used for heating fluids in various applications, such as:

Storage tanks: In direct contact with the fluid to be heated, even under pressure conditions.
Process pipelines: used to increase the temperature of in-line fluids, enhancing operational performance.

Flanged immersion electric heaters are widely used across a broad range of industrial sectors, including:

Flanged Electric Heaters Flanged electric heaters

Industrial kettles and boilers

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Maritime Industry

Pharmaceutical and Electromedical

Plant Engineering

Research and Development

Tanning

Wine Industry

TECHNICAL FEATURES OF FLANGED ELECTRIC HEATERS

Armoured flanged electric heaters are primarily composed of:

Flange for process connection
Heating bundle with dimensions and materials tailored to the process fluid
Cooling and heat exchange baffles between the heating bundle and the fluid
Electric protection unit and terminal head
Thermal sensors for system and heater regulation and safety.

The connection flange of the electric heater is defined in agreement with the client during the offer phase to ensure that the heater is appropriately sized based on process data.

In addition to the functional requirements specified by the client, the design of this heater considers also dimensional (available space), physical, chemical and thermodynamic characteristics of the fluid to be heated. This approach ensures precise selection of heater sizing and construction materials.

The electrical power installed on flanged electric heaters can reach several thousands of kW, depending on client specifications and REART engineering standards.

In general, the following design parameters serve as a reference for sizing flanged electric heaters:

Flanges up to 48″, compliant with ANSI B 16.5 specifications, made of carbon steels, stainless steels and nickel alloys.
Diameter of the heating elements forming the bundle: 8.5, 10 and 15 mm;
Materials of the heating elements: carbon steel, stainless steel (304-321 316L), or nobler alloys such as Incoloy 800 or 825, Titanium or Copper.
Protection rating of the electrical enclosures of the heaters: IP40, IP55, IP65, IP66;
Installed electrical power: up to 2MW per single
Maximum immersion length of the heating bundle: approx. 3 metres.

Accessories

All flanged electric heaters can be fitted with thermal sensors such as thermostats, thermocouples or resistance temperature detectors (PT100) to protect both the system and the heater itself in case of abnormal or unexpected conditions.

Flanged heaters can be equipped with the following accessories:

4-20mA temperature transmitters
Process and heater control and safety sensors (thermostats, PT100 RTDs, thermocouples).
Power and safety cable glands
Electrical command panel and heater control
Anti-condensation heating element (prevention against humidity)

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FAQ - FREQUENTLY ASKED QUESTIONS

What are the maximum flange sizes for flanged electric heaters?

Flanged immersion electric heaters can be mounted on UNI and ANSI flanges ranging from 3” to 24”.

What is the maximum electrical power applicable to flanged electric heaters?

Depending on process conditions, operating temperatures, heat exchange, and predefined electrical parameters, a maximum load of 1.6 MW can be installed on 24” flanges.

Can flanged electric heaters be ATEX certified for potentially explosive areas?
Based on the classification of the installation area, Ex-d marking can be applied, and immersion electric heaters can be built to be suitable for classified areas.

What is the maximum immersion length for flanged electric heaters?

The maximum immersion length that can be manufactured is 2750 mm from the sealing surface of the flanged heater.

Can flanged electric heaters be equipped with regulation and/or safety sensors for process and system monitoring?

Yes, depending on client requirements and system specifications, flanged electric heaters can be equipped with safety and process control systems such as thermostats, PT100 RTDs, or thermocouples, ensuring proper operation of the heater within the system.