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This reaction generates chlorine gas which is commonly known

This reaction generates chlorine gas, which is commonly known to be poisonous. The following is a basic description of how to drain down and repressurise a combi boiler system layouts will vary, but basic components will be the same. On top of every tank you'll find the water supply and delivery pipes the supply pipe routes cold water to the bottom of the tank through the dip tube the hot-water delivery pipe takes water from the top for safety, all water heaters are.

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