Multi split Air to Air heat pump - heating bathrooms

[TheInsulator]

So I'm considering an air to air heat pump for space heating as part of my refurb. House is mid terrace, open plan downstairs where I'm thinking of one large emitter.

Upstairs we have two bedrooms which from my (very limited) understanding would both have emitters. Where I'm really lost is on heating the small office room and our two bathrooms.

Can anyone with knowledge of A2A offer their opinion, I'm guessing a small electric radiator or similar in each?

House is small enough roughly 45 SQM on each level

 

[jj4091]

AFAIK you need one suitably sized for every room you wish to heat. The heat pump needs to be sized to suit the whole house. Much the same as traditional heating. You will need to get the appropriate calculations done by a heating engineer