Zaffy

So complicated, for me at least. Warmflow oil boiler. Heats water and upstairs rads. Wood burning stove, heats water and should heat downstairs rads but doesn't seem to do it very well. All are patchy luke warm. I shutthem off and hoped wood burner would at least warm the towel rail and the laundry room rads. The immersion heats the water cylinder and I have it on at the moment and it is heating the water and the towel rail and the laundry room rad. Since your reply, I am thinking that the towel rail and the laundry room rad are heated by the hot water cylinder and not by the back boiler and when I turned off the two large rads, heat had nowhere to go. Please ignore if my answer is not clear. I am, as you guess, not a plumber.

You may have cracked it. Thanks. I shut off a couple of radiators.

Not sure if this is a plumbing question or a wood burning stove question. Anyhow, this winter, lit the fire. When the stove was hot, the water cylinder became very noisy, swooshing, kettling etc. and hot water rose up into the expansion tank. I was told back boilers can be repaired but not replaced. Not had any joy ringing around. Any ideas, thanks.