Would there normally be a way of turning off
the supply from an immersion heater?
Or does one have to top the cold supply
to the immersion heater?
There are two stopcocks on my immersion heater;
one seems to be on the cold supply,
I'm not sure what the function of the other is.

The plumber who installed the system 30 years ago
has retired to run a pub in London,
but I am sure he would have adopted a standard system.

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

"Timothy Murphy" wrote in message
...
Would there normally be a way of turning off
the supply from an immersion heater?
Or does one have to top the cold supply
to the immersion heater?
There are two stopcocks on my immersion heater;
one seems to be on the cold supply,
I'm not sure what the function of the other is.

The plumber who installed the system 30 years ago
has retired to run a pub in London,
but I am sure he would have adopted a standard system.

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

Turn off the gate valve on the cold feed to the bottom of the hot water
cylinder. This will cut off the hot water supply.



--- news://freenews.netfront.net/ - complaints: ---

Timothy Murphy wrote:
Would there normally be a way of turning off
the supply from an immersion heater?
Or does one have to top the cold supply
to the immersion heater?
There are two stopcocks on my immersion heater;
one seems to be on the cold supply,
I'm not sure what the function of the other is.

The plumber who installed the system 30 years ago
has retired to run a pub in London,
but I am sure he would have adopted a standard system.


Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

Andy C

Andy Cap wrote:

Would there normally be a way of turning off
the supply from an immersion heater?

Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

Thanks (for both replies).
I've always been slightly worried that if one turns off taps at random
on the immersion heater the cylinder might implode.
Is this a foolish worry?

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

"Timothy Murphy" wrote in message
...
Andy Cap wrote:

Would there normally be a way of turning off
the supply from an immersion heater?

Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

Thanks (for both replies).
I've always been slightly worried that if one turns off taps at random
on the immersion heater the cylinder might implode.
Is this a foolish worry?

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

You are only turning off the cold feed to the bottom of the cylinder. The
cylinder is still full of water.



--- news://freenews.netfront.net/ - complaints: ---

In article , Timothy Murphy
writes
Andy Cap wrote:

Would there normally be a way of turning off
the supply from an immersion heater?

Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

Thanks (for both replies).
I've always been slightly worried that if one turns off taps at random
on the immersion heater the cylinder might implode.
Is this a foolish worry?

You're right to be cautious but they have that covered:

1. There is only one control valve and it is only ever at the inlet.

2. Water pushes in at the bottom and displaces hot water out at the top
so that the cylinder cannot be emptied by accident and heated dry.

3. There is an open vent pipe (22mm or 3/4") going all the way back up
to the header tank which allows for expansion as the water is heated.

If you can't find the inlet stop cock to the cylinder or it is seized
you can always uses rubber bungs to stop flow from the header tank or
tie up the ballcock and open the hot tap until flow stops. As said
before, this is safe as the cylinder will not empty.
--
fred
BBC3, ITV2/3/4, channels going to the DOGs

fred wrote:
In article , Timothy Murphy
writes
Andy Cap wrote:

Would there normally be a way of turning off
the supply from an immersion heater?

Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

Thanks (for both replies).
I've always been slightly worried that if one turns off taps at random
on the immersion heater the cylinder might implode.
Is this a foolish worry?

You're right to be cautious but they have that covered:

1. There is only one control valve and it is only ever at the inlet.

2. Water pushes in at the bottom and displaces hot water out at the top
so that the cylinder cannot be emptied by accident and heated dry.


It can. Simply open a hot tap upstairs and run one downstairs.

Air in via upstairs, out via downstairs. How much depends on where the
outflow pipe actually is in the tank.


3. There is an open vent pipe (22mm or 3/4") going all the way back up
to the header tank which allows for expansion as the water is heated.


Assuming it has a header tank of course.


If you can't find the inlet stop cock to the cylinder or it is seized
you can always uses rubber bungs to stop flow from the header tank or
tie up the ballcock and open the hot tap until flow stops. As said
before, this is safe as the cylinder will not empty.

Assuming...these exist

a little knowledge is a dangerous thing..

On Wed, 3 Feb 2010 15:43:48 +0000 someone who may be fred
wrote this:-

If you can't find the inlet stop cock to the cylinder or it is seized
you can always uses rubber bungs to stop flow from the header tank or
tie up the ballcock and open the hot tap until flow stops. As said
before, this is safe as the cylinder will not empty.

Assuming one has cold taps/toilets fed from the tank it makes sense
to turn these on to drain the tank and only when these have stopped
running open the hot tap to get the last water out of the hot pipes.
This wastes little hot water.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000...#pt3-pb3-l1g54

"fred" wrote in message ...
In article , Timothy Murphy
writes
Andy Cap wrote:

Would there normally be a way of turning off
the supply from an immersion heater?

Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

Thanks (for both replies).
I've always been slightly worried that if one turns off taps at random
on the immersion heater the cylinder might implode.
Is this a foolish worry?

You're right to be cautious but they have that covered:

1. There is only one control valve and it is only ever at the inlet.

2. Water pushes in at the bottom and displaces hot water out at the top so
that the cylinder cannot be emptied by accident and heated dry.

3. There is an open vent pipe (22mm or 3/4") going all the way back up to
the header tank which allows for expansion as the water is heated.





If you can't find the inlet stop cock to the cylinder or it is seized you
can always uses rubber bungs to stop flow from the header tank or tie up
the ballcock and open the hot tap until flow stops. As said before, this
is safe as the cylinder will not empty.


On a 30 year old system there is a good chance that will happen. It is
usually easier to just turn the main stoptap off and then open the hot tap
until the flow stops instead of buggering about bunging a tank up.

Adam

slider wrote:

Would there normally be a way of turning off
the supply from an immersion heater?

Turn off the one that feeds into the bottom of the immersion heater. The
water will soon stop flowing.

I've always been slightly worried that if one turns off taps at random
on the immersion heater the cylinder might implode.
Is this a foolish worry?

You are only turning off the cold feed to the bottom of the cylinder. The
cylinder is still full of water.

Thanks again for the replies.
I found in the end that there is a third stopcock on the immersion heater,
hidden under some insulation.
Turning this off did the trick ...

--
Timothy Murphy
e-mail: gayleard /at/ eircom.net
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember The Natural Philosopher
saying something like:

2. Water pushes in at the bottom and displaces hot water out at the top
so that the cylinder cannot be emptied by accident and heated dry.


It can. Simply open a hot tap upstairs and run one downstairs.

Air in via upstairs, out via downstairs. How much depends on where the
outflow pipe actually is in the tank.

Which wouldn't apply to the vast majority of domestic HW cylinders, with
a top outlet.