• Newroad, Pokhara, Nepal
  • +977-61531422
  • contact@muktienergy.com

Vacuum Tube Type Solar Water Heater

Vacuum Tube Type Solar Water Heater :

Vacuum Tubes also referred to as the “Sydney” tube, “twin-tube” or “all-glass”, the tube is essentially two glass tubes that are fused at the top and bottom.  The inner tube has a solar absorbing coating, and the space between the two tubes is evacuated to form a vacuum. The tubes are made from a type of glass called Borosilicate, the same base material as used in many Pyrex glass products used in kitchens around the world. Borosilicate glass has the characteristic of being very strong and also has excellent light transparency.

How Vacuum Tube Type Solar Water Heater works:

The vacuum between inner and outer tubes is an excellent insulator against heat loss, and so evacuated tubes are able to operate very efficiently when there is a big difference between the inside of the tube and the outside ambient air.  For this reason evacuated tubes are the ideal choice for high temperature hot water applications or locations that get cold in the winter.

Technical Specification of Our VTSWH

Description Technical Specs.
Tube Material Borosilicate
Absorber Coating Tri-element
Tube Size Φ58 X 1800 mm
Inner Tank Material SUS 316
Outer Tank Material SUS 201
Inlet/Outlet Connection 1” Male Thread
Tank Insulation 60 mm PUF Insulation
Sacrificial Anode Φ 20 X 300 mm Magnesium Rod
Provision for Backup Heating Yes, 1 ¼ “ Female Thread
Air Vent ¾” Male Thread
Stand S.Steel
Freezing Resistance -15 ºC

Appropriate for a Nepali Family, VTSWH come in four sizes.

Size Capacity Max. Number of Family

15 Tubes

150 Liters 3
20 Tubes 200 Liters


25 Tubes 250 Liters


30 Tubes 300 Liters


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