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UPDATE - 23/10/2013
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Now the heater is already quite a long time in use, and so far it works absolutely perfect, no "fatigue" or the like. I think I will also order other models of this type. Definitely better than this 0815 plastic heater that must be replaced after 1-2 months. I am very pleased about this product un can only recommend it!
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UPDATE - 06/13/2014
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And just for completeness: he still lives and looks like on day 1 :)