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I'm no expert in radiator sizing but I don't think it was miss sized
It was underpowered as it couldn’t heat the room. Was it single panel? A quick calc puts the required power at around 1000 watts but a single panel type ii at 100*60 will put out 800 and typically you over spec the rads and let TRVs modulate the output.
Not to say insulating is the wrong thing to do - with a bigger red you just piss more energy down the drain.
Howard-
It was a single panel, now it is single panel with convection fins. I should have said in my first post that one of my goals was to have his room stay warm enough to not icicle him without the CH on all night. This room gets disproportionately cold vs the rest of the house so insulating is the only way to go imo.
Hovis
1m x 0.6 type 11. Room is 2.9 x 2.7m. I'm no expert in radiator sizing but I don't think it was miss sized. The walls are like fridges at this time of year here.
Hopefully will no longer need to have the CH on overnight after this.