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Notes on combi install -Worcester Bosch - water softener
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David WE Roberts
Sep 29, 2012, 10:39:19 AM9/29/12
to
Our new combi is screwed to the wall and looking cool (because the gas isn't
connected yet).
A couple of things I noted from reading the installation manual (which I
reckon no self respecting plumber ever does).
(1) If there is a non-return valve anywhere in the cold feed (and one is
allegedly often included in a water meter) then there must be a small
expansion vessel in the cold feed after the non-return valve and before the
boiler to protect against over pressure.
I think that water softeners may also include a non-return valve to prevent
softened water going back into the main, but I'm not certain.
(2) Softened water must NOT be used in the central heating circuit because
it can damage the aluminium heat exchanger.
So when filling the system the water softener should be bypassed.
I assume a minor re-pressurisation would not cause a problem.
I now wonder what the heat exchanger for the hot water is made of.
Cheers
Dave R
--
No plan survives contact with the enemy.
[Not even bunny]
Helmuth von Moltke the Elder
(\__/)
(='.'=)
(")_(")
connected yet).
A couple of things I noted from reading the installation manual (which I
reckon no self respecting plumber ever does).
(1) If there is a non-return valve anywhere in the cold feed (and one is
allegedly often included in a water meter) then there must be a small
expansion vessel in the cold feed after the non-return valve and before the
boiler to protect against over pressure.
I think that water softeners may also include a non-return valve to prevent
softened water going back into the main, but I'm not certain.
(2) Softened water must NOT be used in the central heating circuit because
it can damage the aluminium heat exchanger.
So when filling the system the water softener should be bypassed.
I assume a minor re-pressurisation would not cause a problem.
I now wonder what the heat exchanger for the hot water is made of.
Cheers
Dave R
--
No plan survives contact with the enemy.
[Not even bunny]
Helmuth von Moltke the Elder
(\__/)
(='.'=)
(")_(")
Andrew Gabriel
Sep 29, 2012, 2:41:15 PM9/29/12
to
In article <acofgl...@mid.individual.net>,
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
"David WE Roberts" <nos...@btinternet.com> writes:
> Our new combi is screwed to the wall and looking cool (because the gas isn't
> connected yet).
>
> A couple of things I noted from reading the installation manual (which I
> reckon no self respecting plumber ever does).
>
> (1) If there is a non-return valve anywhere in the cold feed (and one is
> allegedly often included in a water meter) then there must be a small
> expansion vessel in the cold feed after the non-return valve and before the
> boiler to protect against over pressure.
> I think that water softeners may also include a non-return valve to prevent
> softened water going back into the main, but I'm not certain.
>
> (2) Softened water must NOT be used in the central heating circuit because
> it can damage the aluminium heat exchanger.
> So when filling the system the water softener should be bypassed.
> I assume a minor re-pressurisation would not cause a problem.
> I now wonder what the heat exchanger for the hot water is made of.
The ones I've seen look like stainless steel.
> Our new combi is screwed to the wall and looking cool (because the gas isn't
> connected yet).
>
> A couple of things I noted from reading the installation manual (which I
> reckon no self respecting plumber ever does).
>
> (1) If there is a non-return valve anywhere in the cold feed (and one is
> allegedly often included in a water meter) then there must be a small
> expansion vessel in the cold feed after the non-return valve and before the
> boiler to protect against over pressure.
> I think that water softeners may also include a non-return valve to prevent
> softened water going back into the main, but I'm not certain.
>
> (2) Softened water must NOT be used in the central heating circuit because
> it can damage the aluminium heat exchanger.
> So when filling the system the water softener should be bypassed.
> I assume a minor re-pressurisation would not cause a problem.
> I now wonder what the heat exchanger for the hot water is made of.
--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]
richbi...@gmail.com
Sep 30, 2012, 4:10:04 AM9/30/12
to
Huge debate about using soft water in boilers, to date no evidence has been found to show any form of corrosion. 1000's of modern boilers happily use softened water. SEE http://www.ukwta.org/pdfs/UKWTA-SoftenedWaterAluminium.pdf and http://www.theministryofcommonsense.org/boilers
Onetap
Sep 30, 2012, 8:26:06 AM9/30/12
to
On Saturday, September 29, 2012 3:39:18 PM UTC+1, David WE Roberts wrote:
> I think that water softeners may also include a non-return valve to prevent
>
> softened water going back into the main, but I'm not certain.
The NRV is not a part of the softener, but UK softener installations should have a
> I think that water softeners may also include a non-return valve to prevent
>
> softened water going back into the main, but I'm not certain.
double check valve fitted, as you say, to prevent back-siphonage of brine into the mains. It's in the water Regulations.
David WE Roberts
Sep 30, 2012, 12:33:27 PM9/30/12
to
"David WE Roberts" <nos...@btinternet.com> wrote in message
news:acofgl...@mid.individual.net...
> Our new combi is screwed to the wall and looking cool (because the gas
> isn't connected yet).
>
> A couple of things I noted from reading the installation manual (which I
> reckon no self respecting plumber ever does).
>
> (1) If there is a non-return valve anywhere in the cold feed (and one is
> allegedly often included in a water meter) then there must be a small
> expansion vessel in the cold feed after the non-return valve and before
> the boiler to protect against over pressure.
> I think that water softeners may also include a non-return valve to
> prevent softened water going back into the main, but I'm not certain.
>
> (2) Softened water must NOT be used in the central heating circuit because
> it can damage the aluminium heat exchanger.
> So when filling the system the water softener should be bypassed.
> I assume a minor re-pressurisation would not cause a problem.
> I now wonder what the heat exchanger for the hot water is made of.
Oh, and if installed in an airing cupboard there must be a barrier between
> isn't connected yet).
>
> A couple of things I noted from reading the installation manual (which I
> reckon no self respecting plumber ever does).
>
> (1) If there is a non-return valve anywhere in the cold feed (and one is
> allegedly often included in a water meter) then there must be a small
> expansion vessel in the cold feed after the non-return valve and before
> the boiler to protect against over pressure.
> I think that water softeners may also include a non-return valve to
> prevent softened water going back into the main, but I'm not certain.
>
> (2) Softened water must NOT be used in the central heating circuit because
> it can damage the aluminium heat exchanger.
> So when filling the system the water softener should be bypassed.
> I assume a minor re-pressurisation would not cause a problem.
> I now wonder what the heat exchanger for the hot water is made of.
the clothes and the boiler, with a limit to the size of the holes in the
barrier.
Not sure what risk this is guarding against as the boiler is room sealed and
the flue is out the top and twin walled.
newshound
Sep 30, 2012, 6:24:41 PM9/30/12
to
On 30/09/2012 17:33, David WE Roberts wrote:
> Oh, and if installed in an airing cupboard there must be a barrier
> between the clothes and the boiler, with a limit to the size of the
> holes in the barrier.
> Not sure what risk this is guarding against as the boiler is room sealed
> and the flue is out the top and twin walled.
>
Hadn't come across that; mine is at one end of a fitted wardrobe, with
> Oh, and if installed in an airing cupboard there must be a barrier
> between the clothes and the boiler, with a limit to the size of the
> holes in the barrier.
> Not sure what risk this is guarding against as the boiler is room sealed
> and the flue is out the top and twin walled.
>
no barrier. Rail arrangement ensures boiler can't get "insulated"
although the casing runs very cool anyway.
Frank Erskine
Sep 30, 2012, 7:55:04 PM9/30/12
to
amongst the clothes/whatever.
The manufacturer's just covering its own arse, especially as some
airing cupboards are a fairly confined space.
--
Frank Erskine
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