The hot water produced by vacuum tubes must be kept for a long time. Heat preservation performance of the  water tank  directly determines that whether you can obtain the hot water and how much hot water you can get.  The solar water  heaters should produce hot water all the year round and be used above ten years, the base line  that the heat  preservation of water tank must holds as follows:

 The heat preservation material must be best because the inferior polyurethane foam can not preserve heat any  more  after one or two years. High quality select material is basic;
 Foam-producing technique is very important. Handiwork or half automatic foam-producing leads to the uneven£¬low  hole closed rate, foam inanition and other problems and as a result, the heat preservation performance is bad.  However,  the advanced automatic foam-producing technique can guarantee the performance of the foam.
 Inspections are safeguard: inspections must cover the whole process and the performance of the foam  producing to  guarantee the favorable heat preservation performance of the water tank.

 From select material, technique to inspection, the production of Himin water tank is precisely controlled in  order to  guarantee the nice heat preservation performance of the water tank and low temperature  dropped of the previous  night.
 Apply import high quality polyurethane, which is formed according to scientific prescription to guarantee the nice  heat  preservation performance.
 Automatic computer controlled constant temperature, high voltage, fixed quantity one time foam through high  temperature processed to ensure the fully uniformity of the foam, low coefficient of heat transmission and low  temperature dropped of the previous night.
 The utilization of the density inspection equipment make sure that the density of the foam layer at gold density  40KG/M3  and the hole closed rate above 92% to ensure the lowest heat transmission coefficient and the best  heat preservation  performance.


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