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Answer: no, draining the water heater is part of the regular maintenance to be performed every two to three years.
Draining the water heater has nothing to do with replacing a tap on your installation. The purpose of draining is to descale the water heater in order to guarantee its proper functioning over time, and to save energy. This is part of regular maintenance, which should be done every two or three years. There is therefore no need to drain the water heater by changing the valve. However, you must cut off the water supply. However, if you have noticed a problem with hot water, or if the water coming out of the tap is dirty (red), and that is the reason why you decided to replace it, then in this case know that the problem is not with the tap but with the water heater. In this case, emptying is necessary. You too, send us your brico question