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it is heat pipe,, , Insulation is rock wool - more info check here: http://www.sourcingappliances.com/header-mainfold-30155643/

Quick Brief

Type: Evacuated Tube Heating System: Thermosyphon (Passive) Connection Type: Split Certification: CE Place of Origin: Zhejiang China (Mainland) Use: Bathroom

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it is heat pipe,

Insulation is rock wool

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Price Terms:FOB,CIF,EXW

Payment Terms: T/T,Western Union,MoneyGram,L/C

Minimum Order: Negotiatable

Delivery Port: Customized

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Specifications and Product Details:

The evacuated tubes are glass tubes manufactured from strengthened borosilicate glass. The tubes have a double outer layer; the outer layer is fully transparent to allow solar energy to pass through unimpeded. The inner layer is treated with a selective optical coating which causes energy absorption without reflection. The inner and outer layer are fused at high temperatures at the end leaving an empty space between the inner and outer layers. All air is pumped out of the space between the two layers (evacuation process) creating the thermos effect which stops conductive and convective transfer of heat which might otherwise escape into the atmosphere. Heat loss is further reduced by the low-emissivity nature of the type of glass that is used.

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