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Connect the water heater to the removal of cold water at a certain point of the system — the bathroom or in the kitchen. Special nozzles are usually sold with the device, so you should not bother with the installation of a conventional tap on it, go to the shower watering can, especially since in this case the heating of the water will worsen. In addition, special nozzles normalize water consumption, increase the output resistance, which ensures uniform filling of the heater. There are several pressure and heating modes on the shower, which more subtly adjust the water temperature. You can choose them by turning the watering of the watering can.