Instantaneous means in the main it will need a dedicated supply, but a small reservoir means the supply can be a lot smaller, so this
unit is only 1.5 kW so can be plugged into any socket, and do the same thing, I had one in a caravan I was living in, with a 1 kW element, and the cupboard it was in was cool, so the losses must be very low, so instantaneous Height / Width / Depth (mm) 185 x 130 x 75 and stored Product Dimensions 260 x 260 x 280 mm so it is size v running new cable.
For me, also means cost more for instantaneous, as uses more than the solar inverter can supply.
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