I am fitting a power shower in my bathroom, and need a 3A switched supply.
Is it ok to spur off my imersion heater supply with a 3A switched fuse? This
is the nearest available supply and has its own supply from the consumer
unit.

Thanks

Phil

"manoman" wrote in message
...
I am fitting a power shower in my bathroom, and need a 3A switched supply.
Is it ok to spur off my imersion heater supply with a 3A switched fuse?
This
is the nearest available supply and has its own supply from the consumer
unit.

Thanks

Phil


I believe you can also take a feed from the light circuit this is normally
near by as well. I don't see anything wrong in what you plan to do, although
I don't know wiring regs.

I am fitting a power shower in my bathroom, and need a 3A switched supply.
Is it ok to spur off my imersion heater supply with a 3A switched fuse?
This
is the nearest available supply and has its own supply from the consumer
unit.

Very probably. The immersion is probably a 3kW @ 240V, taking 12.5A. No
diversity would be allowed for this. However, I doubt the pump takes more
than 2.5A (probably more like 1A continuous), so it should be fine for a 15A
circuit. Obviously there is no issue for a 16A circuit either.

Christian.

stunning, cheers for the info guys.


"Christian McArdle" wrote in message
t...
I am fitting a power shower in my bathroom, and need a 3A switched
supply.
Is it ok to spur off my imersion heater supply with a 3A switched fuse?
This
is the nearest available supply and has its own supply from the consumer
unit.

Very probably. The immersion is probably a 3kW @ 240V, taking 12.5A. No
diversity would be allowed for this. However, I doubt the pump takes more
than 2.5A (probably more like 1A continuous), so it should be fine for a
15A
circuit. Obviously there is no issue for a 16A circuit either.

Christian.

Will you be fitting a pump in the airing cupboard and teeing into existing
pipework ?

Hays


manoman wrote:
stunning, cheers for the info guys.


"Christian McArdle" wrote in
message t...
I am fitting a power shower in my bathroom, and need a 3A switched
supply. Is it ok to spur off my imersion heater supply with a 3A
switched fuse? This is the nearest available supply and has its own
supply from the consumer unit.

Very probably. The immersion is probably a 3kW @ 240V, taking 12.5A.
No diversity would be allowed for this. However, I doubt the pump
takes more than 2.5A (probably more like 1A continuous), so it
should be fine for a 15A circuit. Obviously there is no issue for a
16A circuit either.

Christian.

--
Regards

Hays

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www.phonepro.go.to


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Its one of those all-in-one units from Triton, but the wall I am mounting it
on in the bathroom backs onto the airing cupboard through a hollow wall.

I am taking a dedicated feed from the cold water tank in my loft and then
teeing into the hot water supply. Is this best practice?

The plan is to make it as clean an installation as possible then upgrade to
a separate pump system later and put the pump under the bath.

Phil



"hays" wrote in message
...
Will you be fitting a pump in the airing cupboard and teeing into existing
pipework ?

Hays


manoman wrote:
stunning, cheers for the info guys.


"Christian McArdle" wrote in
message t...
I am fitting a power shower in my bathroom, and need a 3A switched
supply. Is it ok to spur off my imersion heater supply with a 3A
switched fuse? This is the nearest available supply and has its own
supply from the consumer unit.

Very probably. The immersion is probably a 3kW @ 240V, taking 12.5A.
No diversity would be allowed for this. However, I doubt the pump
takes more than 2.5A (probably more like 1A continuous), so it
should be fine for a 15A circuit. Obviously there is no issue for a
16A circuit either.

Christian.

--
Regards

Hays

T610 Housings in stock now!!
www.phonepro.go.to


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.538 / Virus Database: 333 - Release Date: 10/11/2003

I am taking a dedicated feed from the cold water tank in my loft and then
teeing into the hot water supply. Is this best practice?

The main issue is one of sucking air through the hot water cylinder vent
pipe. It is standard practice to have a separate tapping in the cylinder for
the shower called a flange. There are several types.

However, you can sometimes get away with using the standard hot water
outlet. If this is to work, you need to have a good flow rate from the cold
header tank into the cylinder. This is helped by having large bore pipe (at
least 22mm) from a tank sitting directly above with flowed bends rather than
elbows and full bore valves. At the other extreme, it is unlikely to be
successful if you have 15mm pipe flowing halfway round the house to the
cylinder with inline isolator ball valves and elbows aplenty.

It is easy enough to see if it works first and then fit a flange if you get
air in the pump (or upgrade a seriously deficient but easily accessed
cylinder cold tank supply).

Christian.

Hi Christian,
I'm contemplating much the same exercise (power shower in the distant
future) hence
I'm interested in this thread):

"Christian McArdle" wrote in message
t...
I am taking a dedicated feed from the cold water tank in my loft and then
teeing into the hot water supply. Is this best practice?

The main issue is one of sucking air through the hot water cylinder vent
pipe. It is standard practice to have a separate tapping in the cylinder
for
the shower called a flange. There are several types.

However, you can sometimes get away with using the standard hot water
outlet. If this is to work, you need to have a good flow rate from the
cold
header tank into the cylinder. This is helped by having large bore pipe
(at
least 22mm) from a tank sitting directly above with flowed bends rather
than
elbows and full bore valves. At the other extreme, it is unlikely to be
successful if you have 15mm pipe flowing halfway round the house to the
cylinder with inline isolator ball valves and elbows aplenty.

So you wouldn't envisage much problems with a 28mm feed to the hot tank from
the loft cold storage and a 28mm output which could be teed for the power
shower?



It is easy enough to see if it works first and then fit a flange if you
get
air in the pump (or upgrade a seriously deficient but easily accessed
cylinder cold tank supply).


The symptoms of sucking air being what apart from the noise ?

Mungo

"manoman" wrote in message
...
I am fitting a power shower in my bathroom, and need a 3A switched supply.
Is it ok to spur off my imersion heater supply with a 3A switched fuse?
This
is the nearest available supply and has its own supply from the consumer
unit.

Hi Phil,

I would add that strictly speaking, this is not OK.
Fixed immersion water heaters 15 litres should be powered by their own
separate circuits.

--
John

The symptoms of sucking air being what apart from the noise ?

The pump will surge, and the water coming out of the head may splutter.

Christian.

Fixed immersion water heaters 15 litres should be powered by their own
separate circuits.

Not to my knowledge. However, you may not apply diversity, so a 3kW @ 240V
heater needs to have 12.5A of a circuit dedicated to only its requirements
that can't be borrowed by another device. This would preclude it from being
installed on a ring main or socket radial circuit. However, a 16A radial
circuit with a 13A FCU to the immersion and a 3A FCU to the pump is fine.

Christian.

In message ,
"manoman" wrote:



"Christian McArdle" wrote in message
t...
I am fitting a power shower in my bathroom, and need a 3A switched
supply.
Is it ok to spur off my imersion heater supply with a 3A switched fuse?
This
is the nearest available supply and has its own supply from the consumer
unit.

Very probably. The immersion is probably a 3kW @ 240V, taking 12.5A. No
diversity would be allowed for this. However, I doubt the pump takes more
than 2.5A (probably more like 1A continuous), so it should be fine for a
15A
circuit. Obviously there is no issue for a 16A circuit either.

Christian.



stunning, cheers for the info guys.


Actually this is forbidden in the Regs / On Site Guide. Fixed heating of
vessels more than 15l must be supplied by their own dedicated circuit.

In practice though, you may get away with it. The question is that if
your immersion *is* taking 12.5A and your pump *does* take 2.5A (or more
on startup - could cause nuisance tripping), what happens when they're
working at the same time, which is more than likely? The circuit is
working "at capacity" for the length of your shower and although this
should be fine, if everything was calculated / installed correctly, you
leave yourself no leeway.

It's up to you, but I'd be looking for the upstairs socket ring from
which to spur or, if desperate, a lighting circuit.

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
Don't fight technology, live with it: http://www.livtech.co.uk/
.... There's nothing quite so wonderful as money.

In message ,
"Christian McArdle" wrote:

Fixed immersion water heaters 15 litres should be powered by their own
separate circuits.

Not to my knowledge. However, you may not apply diversity, so a 3kW @ 240V
heater needs to have 12.5A of a circuit dedicated to only its requirements
that can't be borrowed by another device. This would preclude it from being
installed on a ring main or socket radial circuit. However, a 16A radial
circuit with a 13A FCU to the immersion and a 3A FCU to the pump is fine.


Ok, looked it up. The requirement isn't in the regs, per-se, but is in
the OSG, Apx 8, p 154. The setup you describe will probably be ok, but
given the above probably wouldn't be considered "best practice".

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
Don't fight technology, live with it: http://www.livtech.co.uk/
.... I like Boolean logic. NOT!