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I just had ours done, needed a dedicated 20A supply for the outdoor ASHP unit (armoured cable), a dedicated 16A supply for the immersion element in the unvented cylinder, and a 5A fused spur for the controller.
I ran a draw cable underfloor (bit of spare CAT6A) for the future EV charger, so that when we’re ready to install we can just pull through whichever will be the most suitable cable at that point in time.
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If you're getting your CU upgraded it will more than likely have RCBO's, Heatpumps shouldn't be fed by an RCBO as the DC leakage current can cause issues. They require a Type B RCD, significant more expensive than a Type A.
https://www.youtube.com/watch?v=jzpZSTUCqTE&t=38s
You'll probably end up with a RCBO consumer unit and 2nd smaller Type B RCD board feeding the ASHP.
Or do what my installer did and slam an MCB into an RCBO board and provide a certificate stating a type B RCD had been installed. Returning to rectify once he was called out on it.
Other considerations/brain dump:
Location of ASHP from CU, as part of the wider work, would installing the cable now be an option
Location of EV charger from CU, same as above
What type of electrical supply do you have to your house, is it looped(in your meter cupboard, do you have 1 or 2(looped) black cables entering the property) if its looped the DNO will need to appove before an EV charger can be installed.
Size of DNO cut out circuit breaker, if my EV charger and ASHP are both running, I draw 54A, my cut out is 100A, but many houses are 63A
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ectoplasmosis
Tango130
@gillies
I'm getting my consumer unit upgraded soon as part of wider work. Do I need anything special done to make sure it's ready for a heatpump when I decide to get one in a few years?
Probably need to know the same thing but for an EV charger...