help with which heating system, electric radiators vs water filled radiators

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Grateful for some help. My son and partner need to upgrade their oil powered central heating (combi boiler). They are off-grid. The house is mid-terrace and on 3 floors but nearly all the time only the ground floor is occupied. They keep erratic hours so storage heaters probably wouldn't work. All the water-filled radiators (12) are very old and need replacing. Also an extension add-on will need another 3 radiators. They spend nearly all their time in 2 or 3 rooms so don't need to heat the whole house. The insulation will be upgraded and new windows fitted. The payback time for solar makes it difficult to consider. Not really interested in heat-pumps ecause of installion and running costs. Don't really want underfloor heating either as it takes a long time to heat up. So the question seems to be to add a new electric boiler (which I understand would need to be the most powerful available to meet the energy demands on the rare occasions that the property is fully occupied) and upgrade all the radiators or to, e.g., have electric radiators (but which ones?) in the rooms they use most with the other radiators upgraded....unless anyone has any better suggestions...please!! Also, would batteries that can download cheap nighttime electricity be a good idea?
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Oil is far far cheaper than leccy, especially if you've got the infrastructure already there. Oil would have to be over £3 a litre to cost the same to run as an electric boiler.
As said above, if you've go to replace radiators then it would be a good idea to ensure that they are large enough to cope with low flow temperatures in the even that heatpumps become a bit cheaper to install and run in the future.
BTW I'm not against heatpumps, I've got one and I'm very happy with it but they aren't any cheaper to run than oil or mains gas at the moment and are very expensive to install