Neighbors have been working like this for more than 4 years. That's why I bought the same one. I live 1, once I heated the water with all 2 kW, turned off 1.3 kW and the remaining 0.7 kW is completely enough for me. Children or friends will come - I will turn it on more powerfully. It is convenient and the network is not overloaded, which is a big inconvenience in winter when electric space heating is on. LH: Don't be fooled by 5 warranties if you don't have a ground connection. ;)
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