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About product and suppliers:
        Alibaba.com offers 3,445 passive solar hot water system products. About 1% of these are water treatment. 

A wide variety of passive solar hot water system options are available to you, such as wall mounted, freestanding. You can also choose from free samples, paid samples. 

There are 3,356 passive solar hot water system suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Greece, which supply 99%, 1%, and 1% of passive solar hot water system respectively. 

Passive solar hot water system products are most popular in South America, Mid East, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 1,983 with ISO9001, 625 with Other, and 346 with ISO14001 certification.