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Good call, yes there's a cable to the small cylinder, so I'll just leave it switched as it is and see if we get hot water, then I'll know which way it needs to stay. Fingers crossed it's that simple!

Daniel, yes there's 2 tanks in the loft, and in the hot press there's the main tank and then a tiny cylinder to the side which we thought was part of the back boiler system. Yes as far as we know the builder rebult the chimney same as previous, it was just to repair some cracked bricks but he...

Thanks everyone for your comments. There is a fused switch in the hot press which I assume is the immersion that was switched to off, I've switched it the other way and will light a small fire, see what happens. Maybe it's a pump. If it's no different I guess it's something blocking the damper...

Thanks guys - yes that's the system I assume we have. All the radiators work with the oil heating. Had wondered about the damper being blocked. But with the fire going turning it on and off still makes a massive difference to the direction of the flames, with it directed to the boiler nearly all...

oil boiler outside heats rads and hot water too - but we're careful not to have it on at same time as fire. We're the only house on the block still to have open fire and back boiler, so can't ask anyone else how their's works...

we've been advised that these houses were built without the back boilers connected to radiators, not big enough system

well, not sure honestly, we don't have any info on it. But there's definately no switch and it worked comfortably last winter heating the hot water nicely even with the damper closed.

7 radiators and a towel rail in the bathroom - thanks Norcon

Have never noticed any of the rads getting hot before so I don't believe the system has changed. I guess my question is why is it suddenly making the water SO hot? What could have happened? Last winter when we were lighting the fire the hot water was a good temperature but this is scalding hot...

Not sure what brand system, we bought the house last winter with no info on the back boiler, but is pure gravity fed, we have no pump to turn on/off, just the damper above the hearth. The boiler doesn't heat any of the rads, so I assume no heat leak rad fitted. I haven't checked if the loft is...

Also the water is that hot that from one fire it is still roasting hot water the next evening

Thanks Jackrae, we've tried closing the damper already and it gets that hot even with the main heat coming back into the room or up the chimney. Can't imagine how hot it would get if we sent it back into the boiler! So I'm not to worry about the brown water? Thought it might be a sign that...

Appreciate any advice on this! We have a 1970s house with an open fire and back boiler that heats the hot water. We recently had the top of our chimney rebuilt and since then when we light the fire the hot water gets CRAZY hot, the hot press cupboard gets so hot that the door handle is too hot...