The kit plus your subscription. You pay for the kit now; the subscription starts after the first month.
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Without the kit you only order extras. They work with a ComfortWatt hub you already have. Add the kit
Use it to follow your order, manage your subscription and find your manual.
You also need a Raspberry Pi 4 (1 GB is enough) with the official USB-C power supply. It's deliberately not in the kit: Pi prices go up and down a lot, so this way you pay no margin and buy it wherever it's cheapest.