top of page



A Solar Thermosiphon Water Heater, also called Passive Solar Thermal system is simply based on the natural circulation of the fluid, as per the physics Laws, a Hot Fluid is usually less dense and lighter than a colder fluid, so hot fluid goes above colder fluid.

The Solar Thermosiphon system is simple, reliable and does not require a pump or a controller to heat the water.

SWH App. 3.jpg
SWH App. 4.jpg
SWH App. 2.jpg


  • Robotic Vertically Integrated Fully Automatic Production.

  • Strict testing of 100% of the units.

  • Durable Storage tank  for Humidity, UV & coastal areas resistance.

  • Highest quality Glass Enameling backed at 850°C according to RoHs and complying to DIN 4753.3 specifications.

  • The Enameled Tank is with more than 10% Titanium content to avoid cracks which can result in the deterioration of the tanks.

  • High Pressure resistant tank (2.5mm thick) with high density Polyurethane insulation for maximum performance.

  • Double wall marine grade anodized Aluminum Profile
    Frame for increased durability and enhanced insulation.

  • High Density Rockwool insulation to ensure the minimum heat loss possible out of the Collector.

  • Solar Tempered Glass with specialized crystals to minimize the reflection of the direct sun.



  • Villas and Residential Buildings.

  • Schools and Universities.

  • Hotels and Resorts.

  • Residential Compounds.

  • Sporting Clubs.

  • Hospitals and Clinics.

  • Factories and Industrial Buildings.

  • Food and Beverages Retail areas.

  • Stadiums and Sports Venues

  • Malls and Retail Outlets.



  • Passive system with closed Loop design (Propylene Glycol HTF).

  • 160, 200 and 300-Liter capacity.

  • Single & Double collector systems, collectors available in  different sizes.

  • Keymark & SRCC Certified and ROHS & DIN Tested.

  • 81% Solar Efficiency.

  • 3.5 Kw Backup Heating Element.

  • Warranty: 10 Years for the Collectors, 5 Years for the Tank and One Year for the parts.

Calpak Hover 1 - normal.jpg
Calpak Mark 4 - 160 L..jpg
ROHS Logo 2.png
SRCC Logo.gif
DIN Logo_edited.png
Compliant, Tested and Certified
bottom of page