Rub wrote:
I've had a new vaillent combination boiler and have steam comin from
the flue. is this normal because i can't remember steam coming from my
old standard gas boiler.

R

Yes, it's water droplets & it's called pluming. The old boiler emitted
steam, which is colourless. The new boiler will be (should be) a
condensing boiler, so the steam is condensed into water. Some goes down
the drain, some gets blown out with the flue gases.