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About product and suppliers:
        Alibaba.com offers 1,901 closed hot water system products. About 1% of these are heat pump water heaters, 1% are water treatment, and 1% are electric water heaters. 

A wide variety of closed hot water system options are available to you, such as ce, cb, and gs. You can also choose from wall mounted, freestanding. As well as from plastic, stainless steel. And whether closed hot water system is instant / tankless, or storage. 

There are 1,867 closed hot water system suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Australia, and Philippines, which supply 96%, 2%, and 1% of closed hot water system respectively. 

Closed hot water system products are most popular in South America, Domestic Market, and Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 1,494 with ISO9001, 649 with Other, and 232 with ISO14001 certification.