10 units of Vacuum Tubes for solar water heater, evacuated tubes for solar!

List price: US $46.99
Price: US $39.00
You save:US $7.99 (17%)

Product Description



This listing includes:10 units of vacuum tubes (or evacuated tube) for solar,high performance.

Length of tube:500mm

Application:they can used for the demo solar collector, demo solar water heater, or other DIY solar hot water heating system. Get the energy from the SUN.

Remark: the tubes are fragile, we will ship to you via Express.

(if tubes broken, we will ship to you again or refund to you, no worries)



Just like an automobile engine, the computer CPU, evacuated tube is core of the solar water heater.

Its similar to a conventional Dewar flask and consists of two borosilicate glass tubes, resisting to high chemical and thermal shock. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outer tube and inner tube is evacuated to avoid heat loss in conduction and conversion.


Evacuated tubes are aligned in parallel; the angle of mounting depends upon the latitude of your location. In a North South orientation the tubes can passively track heat from the sun all day. In an East West orientation they cantrack the sun all year round.

The efficiency of an evacuated water heater is dependent upon a number of factors, one important one being the level of evacuated radiation in your region.



Basic Specifications of Three Target Glass Vacuum Tube


All-Glass Double-tube co-axial structure

Glass Material

High borosilicate 3.3 glass

External pipe diameter and thickness

58mm, +/-0.6mm; T=1.6mm

Internal pipe diameter and thickness

48mm, +/-0.6mm; T=1.6mm

Pipe Length


Absorptive coating property


Raw glass/Cu/SS-ALN(H)/SS-ALN(L)/ALN

Sediment method

3 Target magnetron sputtering plating

Specific absorption

As=0.93~0.96 (AM1.5)

Emission ratio

h=0.04~0.06 (80oC+/- 5)

Vacuum Tightness


Idle sunning property parameters


Solar Irradiation for obtaining a preset water temperature


H<=3.7~4.2 MJ/m2


H<=2.9~3.2 MJ/m2

Average Heat Loss Coefficient

ULT= 0.4~0.6 w/( m2, oC)


· Please pay within 3 days after auction.
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Delivery details

· Your item will be shipped within 48 hours in business days if payment for the order is cleared before 8PM PST daily (except Saturday, Sunday and Holidays). If there’s an exception, we will inform you.

· Buyer, as the importer, is responsible for paying the customs clearance cost or related TAX.

Terms of sale

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About us

· Welcome to our store. We are specialized on Energy Saving electronics: Solar water heater and controllers, pump stations, solar charge controller, inverter, SOLAR Lamps, etc.. Please visit us often. We are pleased to work with you!

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