I have a house in the Republic of Ireland which has 2 rooms without heating. One is a Kitchen and the other is planned to be a 'breakfast' room.
(all rooms are approx 5m x 3m)
As can be (hopefully) deciphered from the sketch, there is a radiator on the other side of the concrete floored hallway, a fireplace in the breakfast room, and the main house boiler on an adjoining wall.
The Kitchen floors are tiled and I would prefer not to remove/damage them so am trying to figure out how best to heat the rooms.
(Please do ask in comments if you need more/better detail on anything. I'm trying to keep the question concise)