I know a comi can give between 9 - 14 litres per minute of hot water.

Does anybody know the flow rate of hot water from a standard 110 litre indirect copper cylinder.
If the cold water header tank is approx 2m above the cylider then is there 0.2bar pressure......
What would be the flow rate????

cheers

"pauliepie" wrote in message
news

I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the low
pressure cylinder. Works well.

On Tue, 25 Jan 2005 22:55:21 -0000, "IMM" wrote:


"pauliepie" wrote in message
news

I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the low
pressure cylinder. Works well.



But not as well as installing a good quality shower pump like a Stuart
Turner and getting good flow and pressure. At least 25lpm at two
showers concurrently.






--

..andy

To email, substitute .nospam with .gl

the important factor is the head of water above say a shower spray head,to
give good pressure the outlet from the header tank needs to be minium of one
metre above the shower head.

At my last property raised tank to give 1.5m best shower I ever had

IMM wrote:
"pauliepie" wrote in message
news
If the cold water header tank is
approx 2m above the cylider then is there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a
venturi shower that takes it cold off the high pressure mains and hot
from the low pressure cylinder. Works well.

Nonsense, I have less than 2m head and the shower pressure is fine. More
pressure = more fuel, more water, more likely to empty cylinder in time
for the next shower.

Biggles

"Biggles" wrote in message
...
IMM wrote:
"pauliepie" wrote in message
news
If the cold water header tank is
approx 2m above the cylider then is there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a
venturi shower that takes it cold off the high pressure mains and hot
from the low pressure cylinder. Works well.

Nonsense, I have less than 2m head and the shower pressure is fine. More
pressure = more fuel, more water, more likely to empty cylinder in time
for the next shower.

If you like running around the shower to get wet then that's fine. Normal
people like about 1 bar minimum, which is like your tank 30 foot above the
shower head.




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"Andy Hall" wrote in message
...
On Tue, 25 Jan 2005 22:55:21 -0000, "IMM" wrote:


"pauliepie" wrote in message
news

I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the
low
pressure cylinder. Works well.

But not as well as installing a good quality shower pump like a Stuart
Turner and getting good flow and pressure. At least 25lpm at two
showers concurrently.

This is tripe information. Expensive, noisy, vibrates, wakes the house up,
uses too much water making you water bill large, empties the cylinder far
too quickly, souses more gas to heat all the wasted water, etc. Totally
silly idea. Intelligent people don't use them.


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"Alex" wrote in message
...
the important factor is the head of water above say a shower spray head,to
give good pressure the outlet from the header tank needs to be minium of
one
metre above the shower head.

At my last property raised tank to give 1.5m best shower I ever had

You haven't had many showers then!


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On Wed, 26 Jan 2005 02:22:22 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .

But not as well as installing a good quality shower pump like a Stuart
Turner and getting good flow and pressure. At least 25lpm at two
showers concurrently.

This is tripe information.

Expensive,

Depends on your definition of expensive. Yours seems to be anything
involving expenditure greater than 50p, and even that's marginal.

noisy, vibrates, wakes the house up,

Nope. As long as a good quality pump is used none of these points
apply.


uses too much water making you water bill large,

Nope. Even if you have metered water.

empties the cylinder far
too quickly,

The cylinder should have adequate size for the purpose, as should the
storage tank. It's a nonsense to make the shower performance poor to
meet the limitations of an inadequate system.


souses more gas to heat all the wasted water, etc.

Have you been watching fish cookery programs again? Different
newsgroup for that.

Totally
silly idea. Intelligent people don't use them.


I see that you have yet another new news account.........



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--

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To email, substitute .nospam with .gl

"Andy Hall" wrote in message
...
On Wed, 26 Jan 2005 02:22:22 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .

But not as well as installing a good quality shower pump like a Stuart
Turner and getting good flow and pressure. At least 25lpm at two
showers concurrently.

This is tripe information.

Expensive,

Depends on your definition of expensive.

Lot of money when cheaper better solutions are about.

noisy, vibrates, wakes the house up,

Nope.

Yep, they do.

As long as a good quality pump is used none of these points
apply.

Wrong.

uses too much water making you water bill large,

Nope.

Yep.

empties the cylinder far
too quickly,

The cylinder should have adequate
size for the purpose, as should the
storage tank. It's a nonsense to make
the shower performance poor to
meet the limitations of an inadequate system.

They use far too much water. Alos you are suppsoe to register a power
shower pump.

uses more gas to heat all the wasted water, etc.

Have

uses more gas to heat all the wasted water, etc.

Totally silly idea [power shower pumps].
Intelligent people don't use them.



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On Tue, 25 Jan 2005 22:55:21 -0000, "IMM" wrote:


"pauliepie" wrote in message
news

I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the low
pressure cylinder. Works well.

Although better than a gravity fed shower with a small head I found a
venturi shower dissapointing.

Mark

"Mark" wrote in message
...
On Tue, 25 Jan 2005 22:55:21 -0000, "IMM" wrote:


"pauliepie" wrote in message
news

I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the
low
pressure cylinder. Works well.

Although better than a gravity fed shower with a small head I found a
venturi shower dissapointing.

What make?


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On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Tue, 25 Jan 2005 22:55:21 -0000, "IMM" wrote:


"pauliepie" wrote in message
news
I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the
low
pressure cylinder. Works well.

Although better than a gravity fed shower with a small head I found a
venturi shower dissapointing.

What make?

I think it was Aquaflow but I can't remember for sure.

Mark

"Mark" wrote in message
...
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Tue, 25 Jan 2005 22:55:21 -0000, "IMM" wrote:


"pauliepie" wrote in message
news
I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold
feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a
venturi
shower that takes it cold off the high pressure mains and hot from the
low
pressure cylinder. Works well.

Although better than a gravity fed shower with a small head I found a
venturi shower dissapointing.

What make?

I think it was Aquaflow but I can't remember for sure.

Mark

I did a Google:

%%%%%%%%%%%%%%%
In article , "Hugh Goldring"
says:

Homebase have recently started selling
showers which operate on a venturi
principle. I think it is called a Hydro
shower by Croydex. The cold water
supply is mains pressure and the hot
water is gravity fed. Apparently the
flow of mains pressure water passed
a venturi sucks hot water into the flow
and mixes it. I cant find any information
on these devices. Does anyone have any
experience of these showers?

We have a shower that is marketed under
the tradename "Aquadart" which
works on the same prinicple. In our last
house we had a pumped power shower
and I'd say that the Aquaflow is just as good.

Hope that helps - Dave.
%%%%%%%%%%%%%

I installed a Trevi Boost shower about 5 years ago and Ive been very pleased
with it, plenty of pressure in my set up, which incidentally is in a hard
water area. The valves are ceramic so supposedly maintenance free and self
cleaning.

No attention needed so far.

It is very dependant on your mains water pressure though, I would get your
pressure measured and compare it to the spec's available from Trevi before
fitting, also the hot water needs to be really hot because the shower works
best turned full on and therefore needs v hot water to raise the mains cold
water temp/pressure.

JBH
%%%%%%%%%%%%

Further to a request some 10 days ago to do performance tests on my
'Aquadart' venturi shower, here are the results:

Inlet water temperatures: hot = 55 degC cold = 8 degC

Flow rates and shower water temperatures:

Control knob wound to fully cold: 10 litres/min at 8 degC
Control knob wound to fully hot: 8 litres/min at 43 degC

I found that a reasonably hot, just bearable (personal choice?) shower is
with an outlet water temperature of about 40 degC. I didn't bother to
measure the flowrate at this temeperature since it will obviously be between
8 and 10 litres/min.

A quick calculation on the mixing rates suggests that at max outlet
temperature of 43 degC the hot water flow rate is about 6 litres/min with
about 2 litres/min cold flow rate.

Hope that helps - Dave.
%%%%%%%%%%




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"IMM" wrote in message
...

"pauliepie" wrote in message
news

I know a comi can give between 9 - 14
litres per minute of hot water.

It can give up to 22 litres/min, depending on which one you buy.

Does anybody know the flow rate of hot water
from a standard 110 litre indirect copper cylinder.

DEpenmding on the height of the tank above and the size of the cold feed
pipe. Apprix 25-30 litres/min on avaerge, but at a very low pressure.
Volume but no pressure.

If the cold water header tank is
approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

You will have to run around the shower to get wet. You can use a venturi
shower that takes it cold off the high pressure mains and hot from the low
pressure cylinder. Works well.

If replacing a cylinder, you may want to replace it with a shower coil
cylinder. This has a coiler in the top of the cylinder that only the
showers hot supply, fed from the mains, is run though. They prefer to be
hotter than the average to operate effectively, so have the water in the
cylinder at 70-80C and have a blending valve on hot the Draw-off to give
cooler water at the other taps. Then mains high pressure showers and no
silly pumps. Highly effective and simple and reliable, as no moving parts,
except the shower mixer valve, which all showers have, and blending valve,
which may become standard soon anyway.

See http://www.gledhill.net For shower coil cylinder. Other companies make
these too.



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pauliepie wrote in
news
I know a comi can give between 9 - 14 litres per minute of hot water.

Does anybody know the flow rate of hot water from a standard 110 litre
indirect copper cylinder.
If the cold water header tank is approx 2m above the cylider then is
there 0.2bar pressure......
What would be the flow rate????

cheers

You need to think about the head above the shower head, not the HW
cylinder, your 2m may come down to one or even less.

In that case the answer is "not enough".

I use a pumped electric shower off the cold water tank (pump built in to
the shower) - this will bring down loads of scorn, but it works for me.

Instant shower, loads of flow except when it's really cold out, does not
interact with any other water use in the hovel.

Con; it's noisy, but not noticeably outtside the bathroom.

Other solutions have been proposed, some, like good quality external double
ended shower pump I think are better, but *much* dearer, and you need a
tank of hot water - mine will go unconditionally at 15 seconds notice!

Any road up, I doubt if you'll get a good shower with that head

mike

On Wed, 26 Jan 2005 14:22:13 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:

-- snip --
Although better than a gravity fed shower with a small head I found a
venturi shower dissapointing.

What make?

I think it was Aquaflow but I can't remember for sure.

Mark

I did a Google:

%%%%%%%%%%%%%%%
In article , "Hugh Goldring"
says:

Homebase have recently started selling
showers which operate on a venturi
principle. I think it is called a Hydro
shower by Croydex. The cold water
supply is mains pressure and the hot
water is gravity fed. Apparently the
flow of mains pressure water passed
a venturi sucks hot water into the flow
and mixes it. I cant find any information
on these devices. Does anyone have any
experience of these showers?

We have a shower that is marketed under
the tradename "Aquadart" which
works on the same prinicple. In our last
house we had a pumped power shower
and I'd say that the Aquaflow is just as good.

Hope that helps - Dave.
%%%%%%%%%%%%%

I installed a Trevi Boost shower about 5 years ago and Ive been very pleased
with it, plenty of pressure in my set up, which incidentally is in a hard
water area. The valves are ceramic so supposedly maintenance free and self
cleaning.

No attention needed so far.

It is very dependant on your mains water pressure though, I would get your
pressure measured and compare it to the spec's available from Trevi before
fitting, also the hot water needs to be really hot because the shower works
best turned full on and therefore needs v hot water to raise the mains cold
water temp/pressure.

JBH
%%%%%%%%%%%%

Further to a request some 10 days ago to do performance tests on my
'Aquadart' venturi shower, here are the results:

Inlet water temperatures: hot = 55 degC cold = 8 degC

Flow rates and shower water temperatures:

Control knob wound to fully cold: 10 litres/min at 8 degC
Control knob wound to fully hot: 8 litres/min at 43 degC

I found that a reasonably hot, just bearable (personal choice?) shower is
with an outlet water temperature of about 40 degC. I didn't bother to
measure the flowrate at this temeperature since it will obviously be between
8 and 10 litres/min.

A quick calculation on the mixing rates suggests that at max outlet
temperature of 43 degC the hot water flow rate is about 6 litres/min with
about 2 litres/min cold flow rate.

Hope that helps - Dave.
%%%%%%%%%%

Yes. It was an Aquadart. It was fairly old but the performance was
dissapointing. Also it was very very sensitive to pressure
fluctuations. Everyone was banned from using any water when anyone is
in the shower to prevent freezing or scalding.

I don't think it was plumbed in wrongly. The hot feed was the first
branch off the tank and the cold came from the cold feed to the header
tank.

Mark

"Mark" wrote in message
...
On Wed, 26 Jan 2005 14:22:13 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:

-- snip --
Although better than a gravity fed shower with a small head I found
a
venturi shower dissapointing.

What make?

snip e.g.'s

Yes. It was an Aquadart. It was fairly old but the performance was
dissapointing. Also it was very very sensitive to pressure
fluctuations. Everyone was banned from using any water when anyone is
in the shower to prevent freezing or scalding.

I don't think it was plumbed in wrongly. The hot feed was the first
branch off the tank and the cold came from the cold feed to the header
tank.

A dedicated cold feed should have come directly from the stop cock if your
mains was not up to it. Your mains might have been up to it, but you had
all the mains outlets off a 15mm pipe snaking around the house.



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Do you understand the difference between flow and pressure?
Do you think you'd have to 'run around' to get wet if someone tipped a
bucket of water over your head?

However, there appears to be a difference in people's expectations of
showers. Some prefer low pressure drencher showers, such as traditional wide
Victorian roses, or power shower heads on "kid's bubble" mode. These require
only good flow rate and can operate on very low pressures, having low
resistance to flow. These can operate satisfactorily on gravity pressure
systems, provided the pipework and head are OK.

Others prefer the multiple small hole spray setting, or the pulse setting.
Both of these require considerable pressure to work effectively, usually
more than 1 bar. These rarely work well on gravity pressure systems and
usually require a pump or mains pressure.

Christian.

On Thu, 27 Jan 2005 09:33:44 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 14:22:13 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:

-- snip --
Although better than a gravity fed shower with a small head I found
a
venturi shower dissapointing.

What make?

snip e.g.'s

Yes. It was an Aquadart. It was fairly old but the performance was
dissapointing. Also it was very very sensitive to pressure
fluctuations. Everyone was banned from using any water when anyone is
in the shower to prevent freezing or scalding.

I don't think it was plumbed in wrongly. The hot feed was the first
branch off the tank and the cold came from the cold feed to the header
tank.

A dedicated cold feed should have come directly from the stop cock if your
mains was not up to it. Your mains might have been up to it, but you had
all the mains outlets off a 15mm pipe snaking around the house.

What a faff just to achieve a second rate result.




--

..andy

To email, substitute .nospam with .gl

On Thu, 27 Jan 2005 09:33:44 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 14:22:13 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:

-- snip --
Although better than a gravity fed shower with a small head I found
a
venturi shower dissapointing.

What make?

snip e.g.'s

Yes. It was an Aquadart. It was fairly old but the performance was
dissapointing. Also it was very very sensitive to pressure
fluctuations. Everyone was banned from using any water when anyone is
in the shower to prevent freezing or scalding.

I don't think it was plumbed in wrongly. The hot feed was the first
branch off the tank and the cold came from the cold feed to the header
tank.

A dedicated cold feed should have come directly from the stop cock if your
mains was not up to it. Your mains might have been up to it, but you had
all the mains outlets off a 15mm pipe snaking around the house.

Mains seems fine. It's 22mm most of the way from the main up to the
tank. The last few metres to the shower is 15mm as with the hot but I
doubt that's the problem.

Even raising or lowering of the shower head caused the temperature to
drop or rise by a significant amount.

Mark

"Mark" wrote in message
...
On Thu, 27 Jan 2005 09:33:44 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 14:22:13 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:

-- snip --
Although better than a gravity fed shower with a small head I
found
a
venturi shower dissapointing.

What make?

snip e.g.'s

Yes. It was an Aquadart. It was fairly old but the performance was
dissapointing. Also it was very very sensitive to pressure
fluctuations. Everyone was banned from using any water when anyone is
in the shower to prevent freezing or scalding.

I don't think it was plumbed in wrongly. The hot feed was the first
branch off the tank and the cold came from the cold feed to the header
tank.

A dedicated cold feed should have come directly from the stop cock if
your
mains was not up to it. Your mains might have been up to it, but you had
all the mains outlets off a 15mm pipe snaking around the house.

Mains seems fine. It's 22mm most of the way from the main up to the
tank. The last few metres to the shower is 15mm as with the hot but I
doubt that's the problem.

Even raising or lowering of the shower head caused the temperature to
drop or rise by a significant amount.

Usually you need a 22mm dedicated hot supply to the mixer. It is best to
have a Surrey flange of the draw-off tapping, or use dedicated shower
tapping off the cylinder. It is clear the mains is not right somewhere. It
would take a dedicated supply back top the stoop cock and have a full bore s
top cock valve.




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Mains seems fine. It's 22mm most of the way from the main up to the
tank. The last few metres to the shower is 15mm as with the hot but I
doubt that's the problem.

Do you have high pressure? It is possible that a PRV (pressure reducing
valve) just before the shower could allieviate some of the problems. Set to
about 1.5 bar (or as low as you can with satisfactory performance of the
shower), it will ensure that the mains doesn't fluctuate, provided that in
the house pipework it remains above the set figure. It will only work if you
have a high, but variable pressure.

Even raising or lowering of the shower head caused the temperature to
drop or rise by a significant amount.

This is more worrying, but with a low head to the hot side, I suspect that
the pressure change in the hot supply upsets the venturi.

Christian.

"Andy Hall" wrote in message
...
On Thu, 27 Jan 2005 09:33:44 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 14:22:13 -0000, "IMM" wrote:


"Mark" wrote in message
.. .
On Wed, 26 Jan 2005 12:49:35 -0000, "IMM" wrote:

-- snip --
Although better than a gravity fed shower with a small head I
found
a
venturi shower dissapointing.

What make?

snip e.g.'s

Yes. It was an Aquadart. It was fairly old but the performance was
dissapointing. Also it was very very sensitive to pressure
fluctuations. Everyone was banned from using any water when anyone is
in the shower to prevent freezing or scalding.

I don't think it was plumbed in wrongly. The hot feed was the first
branch off the tank and the cold came from the cold feed to the header
tank.

A dedicated cold feed should have come directly from the stop cock if
your
mains was not up to it. Your mains might have been up to it, but you had
all the mains outlets off a 15mm pipe snaking around the house.

What a faff just to achieve a second rate result.

Excellent performance when done properly. Read the thread. You have never
seen a venturi shower in operation, you make things up.


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On Thu, 27 Jan 2005 10:56:18 -0000, "Christian McArdle"
wrote:

Mains seems fine. It's 22mm most of the way from the main up to the
tank. The last few metres to the shower is 15mm as with the hot but I
doubt that's the problem.

Do you have high pressure? It is possible that a PRV (pressure reducing
valve) just before the shower could allieviate some of the problems. Set to
about 1.5 bar (or as low as you can with satisfactory performance of the
shower), it will ensure that the mains doesn't fluctuate, provided that in
the house pipework it remains above the set figure. It will only work if you
have a high, but variable pressure.

Static pressure is just over 3 bar. There was a problem with the main
stop-tap/pipework in the past. Sorting that out had no effect on the
shower performance however.

Even raising or lowering of the shower head caused the temperature to
drop or rise by a significant amount.

This is more worrying, but with a low head to the hot side, I suspect that
the pressure change in the hot supply upsets the venturi.

If that was the case I'm surprised that turning on a cold tap (even at
a low flow rate) upsets the shower temperature so much. This should
have negligable effect on the hot supply.

However, saying all this, we are going to ditch the venturi shower as
we are going to a combi-boiler in a few weeks.

Mark.

If that was the case I'm surprised that turning on a cold tap (even at
a low flow rate) upsets the shower temperature so much. This should
have negligable effect on the hot supply.

I was suggesting that there were two effects here, due to a postulating
hypersenstivity of the shower mixer to pressure.

1. The hot pressure, being gravity fed would be affected by the height of
the shower head.
2. The cold pressure, being mains fed with a constriction on the house feed,
would be affects by other outlets in the house being turned on/off.

However, saying all this, we are going to ditch the venturi shower as
we are going to a combi-boiler in a few weeks.

You may still have the problem with the cold pressure being variable.

Christian.

On Thu, 27 Jan 2005 13:57:46 -0000, "Christian McArdle"
wrote:

If that was the case I'm surprised that turning on a cold tap (even at
a low flow rate) upsets the shower temperature so much. This should
have negligable effect on the hot supply.

I was suggesting that there were two effects here, due to a postulating
hypersenstivity of the shower mixer to pressure.

1. The hot pressure, being gravity fed would be affected by the height of
the shower head.
2. The cold pressure, being mains fed with a constriction on the house feed,
would be affects by other outlets in the house being turned on/off.

However, saying all this, we are going to ditch the venturi shower as
we are going to a combi-boiler in a few weeks.

You may still have the problem with the cold pressure being variable.

We're getting a thermostatic mixer shower so this should be better.

Regards, mark

On Thu, 27 Jan 2005 10:58:27 -0000, "IMM" wrote:




Excellent performance when done properly.

Where "properly" involves substantial replumbing

Read the thread. You have never
seen a venturi shower in operation, you make things up.

I have actually, but there's a lot of plumbing work to achieve the
needed supplies.

it's far easier and better to eliminate all of this by using a good
quality pump like a Stuart Turner and getting consistent results
independent of the vagaries of the mains supply.



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..andy

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"Andy Hall" wrote in message
...
On Thu, 27 Jan 2005 10:58:27 -0000, "IMM" wrote:




Excellent performance when done properly.

Where "properly" involves substantial replumbing

No it doesn't.

Read the thread. You have never
seen a venturi shower in operation, you make things up.

I have actually, but there's a lot of plumbing work to achieve the
needed supplies.

Not so. And no silly pump.

snip misinformation


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On Thu, 27 Jan 2005 16:53:30 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Thu, 27 Jan 2005 10:58:27 -0000, "IMM" wrote:




Excellent performance when done properly.

Where "properly" involves substantial replumbing

No it doesn't.

Additional plumbing back to the stop tap plus rerouting is substantial
and can be time consuming and expensive to do.

It is not a trivial exercise to be glossed over.



--

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"Andy Hall" wrote in message
...
On Thu, 27 Jan 2005 16:53:30 -0000, "IMM" wrote:


"Andy Hall" wrote in message
.. .
On Thu, 27 Jan 2005 10:58:27 -0000, "IMM" wrote:




Excellent performance when done properly.

Where "properly" involves substantial replumbing

No it doesn't.

Additional plumbing back to the stop tap plus rerouting is substantial
and can be time consuming and expensive to do.

It is not a trivial exercise to be glossed over.

He has 22mm pipe most of the way from the mains. It may just require a
pressure reducer before the shower to act as a regulator and/or uprating the
hot pipe all, or most of the way, which will not be a long run.




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