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Dimension drawing of instantaneous water heater

Version A: 289-004XXX

Version B: 289-007200

Instantaneous water heaters of types 289-004XXX and 289-007200

Item number Power suspense connections distance variant special feature
289-004503 3000 230 Rp1 240 A  
289-004511 3000 400 Rp1 240 A  
289-004611 6000 400 Rp1 240 A  
289-007200 1000 - 9000 230/400 Rp1 410 B Switchable

All flow heaters are custom-made and manufactured precisely according to our customers' technical specifications.

Efficient heat

Flow heaters & instantaneous water heaters for industrial and commercial applications

Flow heaters heat media indirectly without it coming into contact with the actual heating element. This design is suitable for sensitive applications such as dialysis machines or drinking water treatment systems. The thermally separated design prevents contamination and ensures stable, controlled heat input. Since all heating components operate separately from the medium, flow heaters achieve a long service life and remain reliable even during continuous operation. They are a robust solution for processes in which purity and operational safety are crucial.We manufacture flow heaters exclusively for industrial and commercial applications. We do not supply instantaneous water heaters for private use.

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Flow heaters for specific applications

Are you looking for a flow heater for a specific application? 

Direct and indirect heating compared

Instantaneous water heaters work with direct heating. The medium comes into direct contact with the heating element. This ensures high efficiency and fast heat transfer. Instantaneous water heaters are suitable as supplementary heating and are often used in heating systems or in geothermal applications as switchable support.

Flow heaters, on the other hand, work indirectly. The medium remains separate from the heating element. This design is more durable and suitable for sensitive media that do not allow direct contact. These include applications in medical technology such as dialysis, drinking water treatment, or supplementary systems in heat pumps and other technical equipment.

The two systems differ significantly in terms of their design and area of application. Direct means maximum efficiency. Indirect means maximum safety and a long service life.

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Which media are suitable for indirect heating?
All media that do not require direct contact with the heating element are suitable. These include water, process fluids, sanitary media, and sensitive substances in medical technology.

The achievable flow rates depend on the specific design. Very low volume flows are just as possible as high throughput rates, as long as the heat-emitting surface is designed appropriately.

With suitable sensor technology and control technology, constant temperatures can be ensured even with varying flow rates. The control deviation remains low with correct design.

Yes, as the devices are custom-built. Connections, dimensions, and control technology can be adapted to existing systems.

Temperature sensors such as Pt100 can be permanently installed and connected directly to the control system.

Customer- and industry-specific tests are carried out, such as pressure and leak tests.

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Frequently asked questions about our instantaneous water heaters

Versatile use of Roegi screw-in heaters

Use Cases » Flow Heaters

Tubular heating elements for commercial kitchens
Heating and cooling systems in the catering industry

In commercial kitchens in hotels, cafeterias, and restaurants, efficient and reliable heat is a crucial factor for smooth operations. Whether for preparing food, keeping dishes warm, or cleaning cooking equipment—tubular heating elements are used wherever heat must be precisely controlled.