Bubbling/Boiling Water in Loft Tank/


S

Sensibleness

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 http://tinyurl.com/485fk
apart from only one of the tanks is in the loft.


Many Thanks in Advance
 
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C

Cicero

Sensibleness said:
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 http://tinyurl.com/485fk
apart from only one of the tanks is in the loft.


Many Thanks in Advance
==============
The tank in your loft ( the bubbling one) is a 'header' tank for the central
heating.

I think your pump is probably on its last legs. Additionally your system may
be in need of flushing. Both these jobs are DIY jobs if you're reasonably
competent.

Do your radiators and hot water tank get hot and if so do they do so as
quickly as they used to before the problem started?

Cic.
 
E

Ed Sirett

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 http://tinyurl.com/485fk
apart from only one of the tanks is in the loft.
The problem is showing itself at the Central Heating header tank.
There could be any number of causes. A duff pump being in the
frame, for sure.

Do use the boiler until this problem is resolved, use the immersion.
 
A

Andy Dingley

Does anyone here recognise this description? Can anyone tell me what's
going on? Is it easy to fix?
Your thermostat has stuck on. Turn off and unplug / isolate the
immersion heater (likely culprit), likewise the C/H boiler.

Be careful washing your hands afterwards - your hot water supply is
probably scalding !

It shouldn't be too hard to fix, especially if it's the immersion.
Swapping thermostats is a simple enough DIY job, with the relevant
"Reader's Digest big book of fixing stuff" to hand.

A boiler gone berserk could be a harder problem to fix. Depends on
where its thermostat is, and if it's beyond the "no user serviceable
parts inside" barrier.
 
D

dg

Ed Sirett said:
The problem is showing itself at the Central Heating header tank.
There could be any number of causes. A duff pump being in the
frame, for sure.

Do use the boiler until this problem is resolved, use the immersion.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html

Isn't this the immersion overboiling and the expanding hot water feeding
back into the CWT?

Sounds like you need a new thermostat on your cylinder.

dg
 
C

Cicero

Andy Dingley said:
Your thermostat has stuck on. Turn off and unplug / isolate the
immersion heater (likely culprit), likewise the C/H boiler.

Be careful washing your hands afterwards - your hot water supply is
probably scalding !

It shouldn't be too hard to fix, especially if it's the immersion.
Swapping thermostats is a simple enough DIY job, with the relevant
"Reader's Digest big book of fixing stuff" to hand.

A boiler gone berserk could be a harder problem to fix. Depends on
where its thermostat is, and if it's beyond the "no user serviceable
parts inside" barrier.
=============
Since the problem seems to coincide with the switching on of the CH boiler
it's more likely to be associated directly with the CH rather than the
immersion heater. But it's a simple matter to test for this simply by
switching off the immersion heater and then check if the problem still
occurs. If it does so then you can probably rule out the immersion heater.

Cic.
 
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S

Sensibleness

Andy Dingley said:
Your thermostat has stuck on. Turn off and unplug / isolate the
immersion heater (likely culprit), likewise the C/H boiler.

Be careful washing your hands afterwards - your hot water supply is
probably scalding !
It is. I forgot to mention this.
It shouldn't be too hard to fix, especially if it's the immersion.
Swapping thermostats is a simple enough DIY job, with the relevant
"Reader's Digest big book of fixing stuff" to hand.

A boiler gone berserk could be a harder problem to fix. Depends on
where its thermostat is, and if it's beyond the "no user serviceable
parts inside" barrier.
We've actually got a variety of Home Care Three Star Service Help
Agreement Thingies and as far as I can tell from the colourful diagram
we are covered for this part of the system, unless it means a new
boiler. We did call them out previously but of course the system
behaved perfectly till they left. They are coming again tomorrow and
this time I'll be able to give them a better idea of what the problem
is.

I asked this question here partly to see if the situation was
dangerous and partly to see whether there was a button I could press
or a switch I could flick to take care of it.

Many thanks for all the replies.
 
S

Sensibleness

Cicero said:
=============
Since the problem seems to coincide with the switching on of the CH boiler
it's more likely to be associated directly with the CH rather than the
immersion heater. But it's a simple matter to test for this simply by
switching off the immersion heater and then check if the problem still
occurs. If it does so then you can probably rule out the immersion heater.
The last couple of days we haven't had the heating on and we have
still had the problem. That said as far as I can tell it also happens
when the heating comes o
 
S

Sensibleness

Cicero said:
=============
Since the problem seems to coincide with the switching on of the CH boiler
it's more likely to be associated directly with the CH rather than the
immersion heater. But it's a simple matter to test for this simply by
switching off the immersion heater and then check if the problem still
occurs. If it does so then you can probably rule out the immersion heater.
The last couple of days we haven't had the heating on and we have
still had the problem. That said as far as I can tell it also happens
when the heating comes on but presumably this is because when the
heating comes on the hot water comes on too. I haven't yet got round
to isolating each part of the system to see when the problem occurs.

cheers
 
C

Cicero

Sensibleness said:
Your thermostat has stuck on. Turn off and unplug / isolate the
immersion heater (likely culprit), likewise the C/H boiler.

Be careful washing your hands afterwards - your hot water supply is
probably scalding !
It is. I forgot to mention this.
It shouldn't be too hard to fix, especially if it's the immersion.
Swapping thermostats is a simple enough DIY job, with the relevant
"Reader's Digest big book of fixing stuff" to hand.

A boiler gone berserk could be a harder problem to fix. Depends on
where its thermostat is, and if it's beyond the "no user serviceable
parts inside" barrier.
We've actually got a variety of Home Care Three Star Service Help
Agreement Thingies and as far as I can tell from the colourful diagram
we are covered for this part of the system, unless it means a new
boiler. We did call them out previously but of course the system
behaved perfectly till they left. They are coming again tomorrow and
this time I'll be able to give them a better idea of what the problem
is.

I asked this question here partly to see if the situation was
dangerous and partly to see whether there was a button I could press
or a switch I could flick to take care of it.

Many thanks for all the replies.[/QUOTE]

==============
You said that the water in the 'bubbling' tank was discoloured and steaming.

I assume that this tank (in the loft) is much smaller than the other two
tanks and that would confirm that it is the CH header tank. If the problem
is an over-active immesrion heater then you would expect the water in the
larger cold tank in the bathroom to be bubbling and discoloured and your tap
water would also be discoloured. For safety reasons you should switch off
both CH and immersion heater and and run off hot water until it runs cold
(noting any discolouration). Then try CH or immersion heater alone to see
what happens. I think it is most likely a CH problem as stated in a previous
post because the hot and cold water system is isolated from the CH heating
water unless you've got a very peculiar system.

Cic.
 
E

Ed Sirett

Isn't this the immersion overboiling and the expanding hot water feeding
back into the CWT?

Sounds like you need a new thermostat on your cylinder.
The OP said "...system comes on in the morning...".
That's not going to be the immersion heater. whcih would take a few hours
to get to boiling point.
 
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S

Sensibleness

I think it is most likely a CH problem as stated in a previous
post because the hot and cold water system is isolated from the CH heating
water unless you've got a very peculiar system.
The man from the Three Star Service Agreement Thingy says it's the
Boiler Thermostat and it'll be fixed on Wednesday. Which makes a
change because he usually says, 'Not covered mate. It's going to cost
you £300. And that's if we can find the parts.'

Thanks
 

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