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. Storage heating, circulation heating of domestic water, protecting solid fuel boilers from overheating, or controlling the temperature of oils and emulsions: Wieland WRW heat exchangers are highly developed, compact solutions that are ready to install.
Key benefits at a glance
Typical applications
Operating range
| Type | Outer surface area [m2] | Finned tube no. | Tube length [mm] | Internal cross section [cm2] | Dimensions [mm] | Weight app. [kg] | ||
|---|---|---|---|---|---|---|---|---|
| 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.
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.
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is done in the (cold) bottom part of the tank if heat is to be added and in the (hot) upper part if heat is to be withdrawn from the tank water.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.
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. | Description | Material |
| 1 | Finned tube GEWA-D | Cu-DHP | K21 |
| 2 | Connection | CuZn21Si3P | SW1 |
| 3* | Insulating sleeve | PA |
| 4** | O-ring | EPDM |
| 5* | Insulating ring | POM-CE |
| 6 | Hollow disk | CuZn40Pb2 | Z48 |
| 7 | Hexagon nut | CuZn40Pb2 | 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.
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.
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