Do I bleed the radiators with the heating on or off?
Off is fine.
Why are you bleeding the rads? If the system hasn't been touched it will be fine.
I have done it on and off in the past.
On is maybe easier as you can feel where the heat is/isn't so very obvious which need the most bleed.
@n3il started
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Do I bleed the radiators with the heating on or off?