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Direct Thermosiphon System

Skylight Direct Thermosiphon Solar Water Heater


Direct Thermosiphon Solar Water Heater is most common used in domestic for its simple structure and economical cost. It's easy to be installed but the system has no pressure; it should be placed on the roof for the water head.

SKYLIGHT Direct Thermosiphon Solar Water Heater

It is one of the most common used solar water heating system for household, hotel, hospital, project application etc. It has simple structure and working principle but is most economical.

It is easy to be installed on the roof indeed as top as possible to keep water head and get enough water flow pressure, cause the compact system has non-pressure, water flows depending on gravity water head. This system matched with vacuum tube solar collector. Water flow inside completes a circulation by its own without pressure, this process is heat thermosiphon, thats the name comes from.


 Inner tank material: Standard stainless steel 304-2B grade, thickness up to 0.4mm.

 Outer shell material: Galvanized Steel coated an anti-corrosion layer, thickness up to 0.45mm.

Outer shell material: Stainless steel, thickness up to 0.31mm.

 Heat insulation layer: 50-60mm integral foam polyurethane.

 Frame: Galvanized steel coated anti-corrosion layer, it can be settled on inclined and flat roof.

 Non-pressurized water tank: Test pressure up to 0.5MPa, working pressure 0.6MPa.

 Reliable compact system with good appearance frame, high efficient collector and excellent performance.

Technical Parameter

Tank capacity (L) : 100L-250L

Tube specification (Diameter x Length) (mm) : X47 x 1500, X58 x 1800

Tube quantity: 18-36

Tube vacuum degree: 5 x 10-3

Tube absorptivity >0.93

Tube heat loss <0.08

Tube heat transfer power: 26000Kw/m2

Working pressure (Mpa) ; 0.6

Anti freeze(C) : -400

Anti hail (diameter mm) : 25mm

Reflector Area (Made of Alum alloy) (m2) : 3.4

Anti-wind support frame: 26.5m/s 10 grade

Inner tank specification (Diameter x Length) (m2)

Material of outer tank: steel coated with AL & Zn

Insulation (mm) : polyurethane 65mm

Electronic heater (fixed in the water tank) : 1100W/ 220V/ 50Hz

Dimensions of inlet and outlet of water: G1/2
Brand Name
Supply Capacity
10000 Units per Month
CE, ISO9001&3A2000, ISO14001
Available Colors
Condition of Goods
Lead Time from Order to Shipment
15 working days
Model Number
Minimum Order Quantity
1 unit
Power Requirements
110/240 Volts
Patents or Trademarks
Terms of Payment
100% T/T
Terms of Sale
FOB Shanghai
Warranty Coverage
3 years
23kg/carton with 8pcs