The water seal height is the height of the water in the siphon that blocks the air from the sewer. According to the European building standard EN 1253, a shower drainage system must be installed with a water seal (height) of at least 50 mm. Sometimes in renovation projects, there isn’t a lot of space available in the floor. A lower water seal height also means a lower installation depth. So, in this case, a siphon with 30 mm water seal can be applied.
Note: a lower water seal height (i.e. 30 mm) means less drainage capacity and can dry out more easily when it isn’t used for a longer period of time, for example during holidays.
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