Cold hallway additional radiator or bigger radiator?

I recently installed a PIV unit in the loft, however this has now made the hallway and landing very cold. I have already adjusted the unit to the lowest setting to optimise humidity management and can’t go any lower.
I was thinking about whether an additional radiator at the top of the stairs would help or would a larger radiator in the hallway be just as effective? It is currently only a single panel 600x600. I was thinking I could swap this for a double or triple panel of the same size. Which would be the better option in this scenario?

Asked by Paul on 30th Jan 2025
Expert Trade Answers
"Swap it for a double will help. Ideally would go with a radiator upstairs aswell"
Answered on 30th Jan 2025 - Member since May 2023 - report
"Hi 600x600 is definitely a small radiator I would upgrade the radiator to 600x1000 that would work perfect or just get a double rad"
Answered on 30th Jan 2025 - Member since Apr 2024 - report
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