The heating is making a racket. It's hard to describe but there's a metallic clanking noise followed by a general racket. This usually happens soon after the system comes on in the morning and then again in the evening.
The arrangement we have is a water heater with a cold water tank directly above it, and directly above those, but in the loft, another water tank. I'm a novice at this but as far as I can tell the problem is in the tank in the loft. What happens is that water feeds into the loft tank and the loft tank starts bubbling. The bubbling causes the general racket. There's steam coming off the water in the loft tank so it seems to me that boiling water is being fed into that tank. Now I'm not totally convinced this should be happening. The water up there is a disgusting shade of brown too.
Does anyone here recognise this description? Can anyone tell me what's going on? Is it easy to fix?
The arrangement sounds like that under the heading 'What are those tanks in the Loft For?' which I found here
Many Thanks in Advance