Data sheet

Wieland WRW

Finned Tube Heat Exchanger for heating liquids

Wieland WRW series heat exchangers are helical coils made with medium-high finned copper tube and brazed connection out of brass.

The standard galvanic tin-plated outside surface reduces the corrosion risk of galvanized steel pipes connected downstream.


Outer surface

Finned tube no.

Tube length

Internal cross


Dmax amax G
WRW 10 1.0 D-1135.12100-00 5,210 0.78 140 350 ½“ 3.6
WRW 13 1.3 D-1135.14100-00 5,780 1.13 147 410 ¾“ 4.7
WRW 18 1.8 D-1135.18100-00 6,590 2.13 170 440 ¾“ 6.7
WRW 23 2.3 D-1135.18100-00 8,380 2.13 170 540 ¾“ 8.4
WRW 26 2.6 D-1135.18100-00 9,290 2.13 170 590 ¾“ 9.3
WRW 31-2 3.1 D-1135.18100-00 11,000 4.26 175 540 1" 11.5
WRW 45-2 4.5 D-1135.18100-00 16,880 4.26 175 790 1" 17.3

Available from stock. Customized design possible on request.


Customized design


With customized series Wieland WRW flex additional flexible designs are available with suitable connecting parts or different tubes and materials for special applications like higher pressure situations.


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  • Option of compact design through high thermal conductivity of copper in combination with optimized heat transfer surface
  • Proven corrosion resistance of copper materials for drinking water
  • Copper – a hygienic and antimicrobial material for use in drinking water storage
  • Exchangeable because of compact coil design



  • Heating of drinking or heating water
  • Tankless water heaters
  • Heating or cooling of many other liquids


Operating range

  • max. operating pressure: 10 bar
  • max. operating temperature:
    + 130°C

Assembly instructions



The mounting to the storage flange is by means of a hexagon nut and hollow disk (included). To avoid vibration failure, the finned tube heat exchanger should be supported in a suitable manner not only for transportation but also in operation.


The mounting is done in the (cold) bottom part of the tank if heat is to be added and in the (hot) upper part if heat is to be withdrawn from the tank water. The position may be horizontal or vertical. The seal is generally placed on the outside, but is also possible on the inside. When fixing the nut, it is necessary to counterhold at the fitting flats.

Electric insulation

Enameled hot water tanks are usually fitted with magnesium or impressed-current anodes to protect inadequately coated areas of the steel vessel against pitting corrosion. To maintain this protective effect, we recommend the use of insulation sets to ensure electrical separation of the heat exchanger from the storage tank. Retrofitting of hot water storage tanks is possible at any time.


Insulating set F

The insulating set F (for flange mounting) consists of an insulating sleeve and an insulating ring. For an outside seal it is fitted between the heat exchanger and the storage tank flange as shown in the figure. Alternately a sealing from the inside is possible. If the flange is less than 8 mm thick, a distance washer (not supplied with the set) should be positioned between the hollow disk and the hexagon nut. Insulating sets are accessories and are supplied on request, two sets are required per heat exchanger.



Part no.DescriptionMaterial
1Finned tube GEWA-DCu-DHP | K21
2ConnectionCuZn40Pb2 | Z48
3*Insulating sleevePA
5*Insulating ringPOM-CE
6Hollow diskCuZn40Pb2 | Z48
7Hexagon nutCuZn40Pb2 | Z48

* not supplied with the set | max. operating temperature: + 95°C
** max. operating temperature: + 130°C | do not use grease containing mineral oil


Insulating set HT


Insulating set HT (for connecting pipes only) consists of a plastic insulating nipple, a gasket and a brass screw fitting.
The inside and the outside thread of the insulating nipple must be fully supported and discharged to ensure reliable operation of the connecting pipes. The insulating nipple has to be firmly screwed into the brass screw fitting so that a reliable seal is formed with the inside gasket.

The insulating set HT is available for following connection dimensions: ½“ | ¾“

The max. operating temperature is + 95°C.

Quality Assurance

Responsibility begins with a high standard of quality. As the first company for semi-finished products in Europe, we have been on the path to certified quality management since 1987.
Today, we have DIN EN ISO 9001:2015 certifications for all producing plants, and our testing laboratories in Ulm and Vöhringen are additionally accredited to DIN EN ISO/IEC 17025:2018.

Pressure Equipment Directive

WRW heat exchangers correspond with the Pressure Equipment Directive 2014/68/EU. 

Your contact for heat exchangers


Wieland Thermal Solutions
Heat exchangers

+49 731 944 1133
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