SIDE-ARM TUBULAR technology
Vertical tubular thermosiphon heat exchangers for transferring heat from boilers or solar circuits into domestic hot-water storage tanks.
Working principle
Hot source fluid transfers heat through the internal tube wall. As tank-side water warms it rises naturally and cooler water returns to the lower connection, creating a thermosiphon loop when the exchanger is installed vertically beside the tank.
Engineering explained
Product imagery is paired with technical context so buyers and engineers can understand construction, flow path and configuration—not just the exterior.
The copper version uses multiple internal tubes, while the stainless version uses an extended fin surface. Materials and connection method are selected separately from the heat-transfer arrangement.
In a storage-tank installation, heated water rises through natural convection while cooler tank water returns to the lower connection. The same vertical fin-tube concept can preheat cold water using shower wastewater heat.
Models & technical data
Compare circuit arrangement and overall dimensions at a glance, then open a product size for its product view, dimension drawing and technical summary.
| Model | A (mm) | B (mm) | C (mm) | Construction | Details |
|---|---|---|---|---|---|
| CSA24 | 609 | 549 | 510 | Fin Side-Arm | Open details |
| SA33 | 840 | 800 | 720 | Fin or copper | Open details |
| SA38 | 977 | 935 | 855 | Fin or copper | Open details |
Published HEXNOVAS Side-Arm catalogue dimensions. The brochure states that the fin design provides approximately five to eight times the surface area of traditional tube-and-shell Side-Arms; actual performance depends on temperatures, circulation and installation.
Dimensions are for reference only. Final dimensions are subject to the approved order drawing. HEXNOVAS reserves the right of final interpretation.
Model details
HEXNOVAS Side-Arm Heat Exchangers
Dimensions are for reference only. Final dimensions are subject to the approved order drawing. HEXNOVAS reserves the right of final interpretation.
Request model selectionModel details
HEXNOVAS Side-Arm Heat Exchangers
Dimensions are for reference only. Final dimensions are subject to the approved order drawing. HEXNOVAS reserves the right of final interpretation.
Request model selectionModel details
HEXNOVAS Side-Arm Heat Exchangers
Dimensions are for reference only. Final dimensions are subject to the approved order drawing. HEXNOVAS reserves the right of final interpretation.
Request model selectionWhy this technology
Product configuration
Typical applications
Selection information
Provide heat-source fluid and temperatures, tank volume, required heating duty, connection material and size, available vertical installation space and water chemistry.
Frequently asked questions
Hot source fluid transfers heat through the internal tube wall. As tank-side water warms it rises naturally and cooler water returns to the lower connection, creating a thermosiphon loop when the exchanger is installed vertically beside the tank.
Provide heat-source fluid and temperatures, tank volume, required heating duty, connection material and size, available vertical installation space and water chemistry.
316L / 304 stainless steel Fin Side-Arm; Copper Side-Arm option; Connection material and method depend on selected construction
The final size is confirmed by thermal calculation using flow rates, inlet and outlet temperatures, allowable pressure drop, design pressure and fluid properties.
Product documentation
Use the published catalogue for product-range reference. Final dimensions, ratings and materials are confirmed for the selected model and operating duty.
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