DIN 4753-7:2011
饮用水所用热水器,水加热装置和贮水式热水器.第7部分:对容量高达1000 l的贮水池的制造,隔热和防腐的要求
Water heaters, water heating installations and storage water heaters for drinking water - Part 7: Tanks with a capacity of up to 1000 l, requirements relating to manufacture, thermal insulation and corrosion protection