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I acquired a small electric Cumulus of 15 l to put under my sink. The water inlets and outlets are in 15/21, on the top of the unit in vertical position. Security groups are in 20/27. How to adapt them? Is it mandatory to install one? Can we choose one that installs directly on the arrival of cold water?

You will need to get a gearbox ¾ half, male / female to adapt your security group. The safety group is mandatory because its role is to evacuate the normal overpressure that occurs in a hot water tank. Connect the safety group to the cold water inlet and then to the water heater.

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