Hot water from eaves overflow

hots

Hi folks, just noticed a fairly steady stream of hot water coming from the overflow out of the eaves, heating had been on for a bit and working fine. Only had the attic worked on last week so I'm guessing they may have knocked something? Anything I should be looking for when I investigate in the morning?

hots

hots wrote: »

Hi folks, just noticed a fairly steady stream of hot water coming from the overflow out of the eaves, heating had been on for a bit and working fine. Only had the attic worked on last week so I'm guessing they may have knocked something? Anything I should be looking for when I investigate in the morning?

Also it's stopped within 2 minutes of the heating being off if that helps.

hots

Also the work done was insulation in the attic. From 5 minutes googling could it be thermostat related? I don't understand it it's just what the top results pointed towards.

Victor

Many heating systems have a small expansion tank in the attic, although I understand this is less common these days. When this tank fills, it will either overflow into the cold water storage or via an overflow pipe at the eaves.

hots

Victor wrote: »

Many heating systems have a small expansion tank in the attic, although I understand this is less common these days. When this tank fills, it will either overflow into the cold water storage or via an overflow pipe at the eaves.

Hmm so I have a big tank and a little tank up there, both had been wrapped in insulation but the little one badly done so that the insulation had fell into the tank. I've taken that off the top but I'm still getting overflow to outside when the heating is on... Any ideas?

In case it wasn't obvious I have no idea what I'm looking at.

spud65

i had the same problem a few years ago and i just changed the ballcock, solved the problem for me.

theteal

Sounds like the same as ours. Little tank is the central heating. The stop valve on ours is crap plastic and limescaled to bits so I have it tied up until someday when I replace it. Anyway it still very slowly fills and when the heat comes on, I get water out the little pipe coming out the facia at the back of the house. Maybe twice a year I'll pop up with a jug a pull a litre or so out of it.

Can you see where the drain pipe is connected to this tank? How close is the water line to this when the heat is not on?

Victor

Ensure there is insulation on top of and on the sides of both tanks. Make sure there is NONE under the tanks.

theteal wrote: »

I have it tied up until someday when I replace it.

Perhaps not the best idea.

hots

Ok so left the heating on high for most of the day and no overflow... So makes me think the only think wrong was that the cover had fallen onto the ball and was causing the overflow?

So the hot tank is currently without a lid which isn't going to be great for damp in the attic and energy efficiency so I think I just need to get the guys back out to do a better lid on top?

hots

Had the tank recovered today and blasting the heating for a few hours now with no overflow 👠all good.