Free Sun has replaced all the complications by using a simple stainless steel 304 inner tank insulated with high quality polyurethane wrapped with a protection layer linked by evacuated tubes installed on the roof to get domestic hot water for free during the year.
The non-pressurized solar water heater uses the principle of thermosiphon; it is economical, easy in installation and investment, with high performance, and it works in different climate conditions.
Based on Evacuated Tube technology
| Product code | FS 16 | FS 20 | FS 24 | FS 30 |
| Tank Capacity | 151 L | 178 L | 200 L | 249L |
| No of tubes | 16 | 20 | 24 | 30 |
| Tube dimension | ø58mmx1.8m | ø58mmx1.8m | ø58mmx1.8m | ø58mmx1.8m |
| Inner tank | Stainless steel 304 | Stainless steel 304 | Stainless steel 304 | Stainless steel 304 |
| Outer tank | PVDF zinc coated steel | PVDF zinc coated steel | PVDF zinc coated steel | PVDF zinc coated steel |
| Insulation foam | Poly urethane 5 cm | Poly urethane 5 cm | Poly urethane 5 cm | Poly urethane 5cm |