| Exact model and dimensions | Roof layout, support structure, access and packaging | Model code, overall dimensions, dry and filled weight |
| Gross vs aperture area | Efficiency and energy output are not comparable across different area bases | Separate gross, aperture and absorber areas in m² |
| Thermal performance | Output varies with incident solar radiation and temperature difference | η₀, a₁, a₂, test conditions, reference area and, where available, yield data |
| Pressure drop / flow | Pipe routing and pump sizing | Recommended flow and pressure-drop curve for the applicable fluid and conditions |
| Rated pressure / connections | Operating safety and hydraulic compatibility | Model-specific pressure limits and connection sizes |
| Materials and approved fluids | Water quality, corrosion, freezing and service life | Absorber, glazing, frame, sealing, tubing and heat-transfer fluid guidance |
| Testing and documentation | Compliance and QA validation for the receiving market | Model-linked test reports, certificates if applicable, installation and packing documents |