Tony Bryer wrote:
Is there a rule of thumb as to the likely static mains water pressu
I'm about to install an Ariston undersink heater which needs a
pressure reducing valve if the pressure is more than 3.5 bar. The
Thames Water site is one of those that has been expensively designed
with not too much thought for what users might want to know.

It can vary a lot. Mine is 6 bar and I have to use such a valve on the feed
to my water softener.
3.5 bar I can hold back with my finger on the tap. 5 bar I cannot

"Tony Bryer" wrote in message
...
Is there a rule of thumb as to the likely static mains water pressu
I'm about to install an Ariston undersink heater which needs a pressure
reducing valve if the pressure is more than 3.5 bar. The Thames Water
site is one of those that has been expensively designed with not too
much thought for what users might want to know.


Tony Bryer




Hi Tony,

You could fit the heater with the reducer valve anyway, because if the
pressure is no where near to high, then the valve will act as just a safety
device in times when the pressure does rise above nominal working pressure.

Fit as per instructions and you won't go wrong.

Only one other point. Does the heater have a minimum working pressure ?


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BigWallop wrote:
You could fit the heater with the reducer valve anyway

Good advice. The valves aren't especially expensive anyway:

http://tinyurl.com/lggu

Andy

Andy wrote:

BigWallop wrote:

You could fit the heater with the reducer valve anyway


Good advice. The valves aren't especially expensive anyway:

http://tinyurl.com/lggu

Andy



Wish I'd remembered to check that site before I bought the expensive and
troublesome to fit, Reliance valve a couple of days ago... :-(

Pressure was 7 BAR here when measured btw, also Thames Water.

Lee



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On Thu, 28 Aug 2003 11:53:11 +0100, Tony Bryer wrote:

Is there a rule of thumb as to the likely static mains water
pressu I'm about to install an Ariston undersink heater which
needs a pressure reducing valve if the pressure is more than 3.5
bar.

Search back, I recently posted the URL of the relevant part of the
OFWAT site that gives the min required pressure at the boundary stop
cock. 7 bar springs to mind.

3.5 bar is only around 35' head just about enough to make it up to the
roof tank(s) but at what flow rate. Sounds to me as if this kit is
designed to be tank fed in a "normal" house rather than mains fed.

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Cheers
Dave. pam is missing e-mail

On Thu, 28 Aug 2003 22:56:24 +0100 (BST), "Dave Liquorice"
wrote:

On Thu, 28 Aug 2003 11:53:11 +0100, Tony Bryer wrote:

Is there a rule of thumb as to the likely static mains water
pressu I'm about to install an Ariston undersink heater which
needs a pressure reducing valve if the pressure is more than 3.5
bar.

Search back, I recently posted the URL of the relevant part of the
OFWAT site that gives the min required pressure at the boundary stop
cock. 7 bar springs to mind.

3.5 bar is only around 35' head just about enough to make it up to the
roof tank(s) but at what flow rate. Sounds to me as if this kit is
designed to be tank fed in a "normal" house rather than mains fed.

Water companies are required to deliver 10 metres of head with a flow
rate of 9 litres/min at the external stop tap. Not a lot is it?



..andy

To email, substitute .nospam with .gl

"Dave Liquorice" wrote in message
. 1...
On Thu, 28 Aug 2003 11:53:11 +0100, Tony Bryer wrote:

Is there a rule of thumb as to the likely static mains water
pressu I'm about to install an Ariston undersink heater which
needs a pressure reducing valve if the pressure is more than 3.5
bar.

Search back, I recently posted the URL of the relevant part of the
OFWAT site that gives the min required pressure at the boundary stop
cock. 7 bar springs to mind.

3.5 bar is only around 35' head just about enough to make it up to the
roof tank(s)

1 bar is approx 30 foot head. 3.5 bar is approx 105 foot. 3.5 bar is very
acceptable with a decent flow.



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In article , Lee Blaver wrote:
Wish I'd remembered to check that site before I bought the expensive and
troublesome to fit, Reliance valve a couple of days ago... :-(

Pressure was 7 BAR here when measured btw, also Thames Water.

THanks for all the replies: advice taken and acted on.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk
Free SEDBUK boiler database browser http://www.sda.co.uk/qsedbuk.htm