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  • Micoe Solar Hot Water Evacuated Tubes

    Ausind Solar Intl provides affordable Micoe Solar Hot Water System designed to suit your property and Needs. We are local Authorized Distributors and Installers for Solar Hot water systems.

    Click Here to See – Micoe Solar Hot Water Evacuated Tubes Brochure

    The system comes with:

    1. 10 Year Tube Warranty
    2. 15 Year Tank Warranty
    3. 2 Years Workmanship Warranty


    Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it into heat for use in water heating. Evacuated tubes have already been used for years in Germany, Canada, China and the UK. There are several types of evacuated tubes in use in the solar industry. Micoe collectors use the most common “twin-glass tube”. This type of tube is chosen for its reliability, performance and low manufacturing cost.

    Each evacuated tube consists of two glass tubes made from extremely strong borosilicate glass. The outer tube is transparent allowing light rays to pass through with minimal reflection. The inner tube is coated with a special selective coating (Al-N/Al) which features excellent solar radiation absorption and minimal reflection properties. The top of the two tubes are fused together and the air contained in the space between the two layers of glass is pumped out while exposing the tube to high temperatures. This “evacuation” of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes. Please Why a vacuum? As you would know if you have used a glass lined thermos flask, a vacuum is an excellent insulator. This is important because once the evacuated tube absorbs the radiation from the sun and converts it to heat, we don’t want to lose it!! The vacuum helps to achieve this. The insulation properties are so good that while the inside of the tube may be 150oC / 304oF , the outer tube is cold to touch. This means that evacuated tube water heaters can perform well even in cold weather when flat plate collectors perform poorly due to heat loss (during high Delta-T conditions).
    In order to maintain the vacuum between the two glass layers, a barium getter is used (the same as in television tubes). During manufacture of the evacuated tube this getter is exposed to high temperatures which causes the bottom of the evacuated tube to be coated with a pure layer of barium. This barium layer actively absorbs any CO, CO2, N2, O2, H2O and H2 out-gassed from the evacuated tube during storage and operation, thus helping to maintaining the vacuum. The barium layer also provides a clear visual indicator of the vacuum status. The silver coloured barium layer will turn white if the vacuum is ever lost. This makes it easy to determine whether or not a tube is in good condition. See picture below.

    The Getter is located at the bottom of the evacuated tube.
    Left Tube = Vacuum Present Right Tube = Faulty

    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 can track the sun all year round.
    The efficiency of a evacuated water heater is dependent upon a number of factors, one important one being the level of evacuated radiation (insolation) in your region.

    Evacuated Tube Basic Specifications

    Length (nominal)

    1500mm /1800mm

    Outer tube diameter


    Inner tube diameter


    Glass thickness


    Thermal expansion

    3.3×10-6 oC


    Borosilicate Glass 3.3

    Absorptive Coating

    Graded Al-N/Al


    >92% (AM1.5)


    <8% (80oC)


    P<5×10-3 Pa

    Stagnation Temperature


    Heat Loss

    <0.8W/ ( m2oC )

    Maximum Strength



    Why Micoe Solar

    Micoe, as an international company, is specialized in researching and providing the solar thermal systems for families, factories and industries around the world. Founded in 2000, Micoe has grown to be the most professional company in China solar thermal industry.

    Today, with the climate and environment quality deteriorating and the fuel cost increasing due to the fewer and fewer regular energy, the world calls for a new, clean and sustainable energy. The application of Micoe system not only helps in reducing the overall electricity and fuel expenditure but also gives you the opportunity to participate in activities of the environmental protection.

    For customers, they could be rest assured the quality of Micoe’s products as Micoe supplies standard testing equipments of perfect performance for solar thermal products. Moreover, Micoe has attained many significant certificates, such as ISO 9001, ISO 14001, CCC, Solar Keymark, SRCC, AS/NZS 2712 etc. Besides, Micoe is one of the only two members of international solar academy in China solar thermal industry.

    At present, Micoe’s main products are Solar Thermal Systems composed by Vacuum tubes, Flat Plate Collector, Heat Pipe Collector, as well as compact solar water heater, etc. Micoe’s solar thermal systems are widely applied in both residential and commercial projects, providing hot water for swimming pool and space heating systems as well as industrial hot water systems, even for the air-conditioning, and the sea water desalination. Micoe has 5 production bases in China and the turnover has reached 3.5billion RMB in 2011. The production ability has reached 3 million units solar water heaters per year. What’s more, Micoe purchased the world most advanced testing machine from ITW in 2010, in order to improving products quality and performance.