Circulation: Does hot water come quickly at the tap/shower or do you have to wait a bit? Otherwise, check the offer or ask the heating technician!
Circulation means that the hot water is continuously pumped in a circle and naturally cools down, so it needs to be reheated accordingly.
Heating element:
Your heat pump has one integrated. So you wouldn’t have had to buy it separately.
And besides, it’s more efficient to generate hot water with the heat pump even in sunshine than with a heating element.
Did the same heating technician who messed up the rest talk you into that?
If you say the heating element is off, do you always mean only the newly installed one?
Urgently check whether it is only activated in the heat pump at severe subzero temperatures!