Noticed today that the upstairs radiators were slightly warm, with the c/h off, after the combi had run a bath, is this normal? The boiler's an Ideal Response.
I've not noticed this happening before in the five years or so we've had the boiler, so I'm guessing it's just convection from the combi coil and I've noticed it today as it's relatively cool and the TRVs have opened.