Modernize a house with night storage heaters, what are the options?

Good day everyone,

My wife and I are currently in the process of purchasing a house. It was built in 1976.
Equipped with night storage heaters, partly "modernized" models. In addition, a hot water boiler (is that the correct term?).

Our plan would be to modernize the following; I would appreciate if someone could take a look and see if I am making a mistake or overlooking something:

- Replace hot water boiler with hot water heat pump (basement model without outdoor unit)
- Night storage heaters will remain for the time being, but if possible not used or only in individual rooms
- Air heat pump air conditioners in the following rooms: 2x children's rooms, 1x living room, 1x bedroom, possibly 1x office
- Pellet stove in the living room with ventilation to hallway and kitchen
- Photovoltaic system with storage

Is this all realistic or just wishful thinking? A complete renovation of the house is not planned due to its very well-maintained condition.
I would appreciate your feedback.

Best regards

Christopher

Then without night storage heaters only the air air heat pump (i.e. air conditioning with heating function). These are always better than direct electric heating.
WWWP only without an outdoor unit if the basement is thermally separated from the rest / is. Otherwise, it pulls the heat from the rooms.

How high has the energy consumption/electricity consumption been so far, have you received any numbers for that? And how much living space do you heat with it?

Then without night storage heaters only air-to-air heat pump (i.e. air conditioning with heating function). These are always better than direct electric.
WWWP only without an outdoor unit, if the basement is thermally separated from the rest. Otherwise, it will pull the heat out of the rooms.

-How exactly should I understand this, what would a thermal separation be? The WWWP would basically be located in the laundry room where the "boiler" is now. This has its own door, so a closed room.

How high has the energy consumption/electricity consumption been so far,
did you get any figures for that?
And how much living space do you heat with it?

I can’t say that exactly. We have figures of 250-330€ electricity costs. About 170 sqm are supposed to be heated.

There are stairwells that are open and go all the way down to the basement. The heat pump needs a relatively large amount of ambient air to heat the hot water. If it were open, it would draw the heat from the living spaces. So you will need an opening to the outside. The energy has to come from somewhere.

I can't say exactly. We have figures of 250-330€ electricity costs. About 170sqm are to be heated.

Prepare yourselves that this will be an old contract. Without knowing the house, I predict a significant increase in these costs.