Getting myself ( as usual) overly complicated in my planning for the
plumbing.
The DIY component is going up all the time because the plumber we had booked
in to do the work is off long term sick and has decided to retire.
So we are recruiting a new plumber (see previous post about Viessman
boilers) but meanwhile the build must go on so I will probably be doing the
majority of the non-CH plumbing apart from installing and commisioning the
boiler.
[Could end up doing the CH as well, but first things first.]

[Possibly there will be queries about equipotential bonding and plastic
pipes to follow.]

Anyway, plastic 22mm cold water supply from the polypropylene mains to the
boiler in the first floor airing cupboard.

This will run past most of the locations for cold water feeds to basin taps,
showers, and toilets.

So as I see it I have two options:

(1) Tee off the 22mm as it goes past each location - this gives a neat short
overall pipe run with a lot of takeoffs from the feed to the boiler. However
there is the potential for a pressure drop along this feed as hot and cold
taps are turned on together, and toilets are flushed.

(2) Run a seperate 22mm or 15mm cold feed alongside the feed to the boiler
all the way back to the incoming main. This may reduce the pressure drop in
the hot water system when cold taps are used - which is the bane of mains
pressure systems such as electric showers and combi boilers.

More pipe, more complicated, but is it worth the effort?

Cheers


Dave R

--
Outlook Express within VMWare Player
Running under W7 64bit

Bump?
"David WE Roberts" wrote in message
...
Getting myself ( as usual) overly complicated in my planning for the
plumbing.
The DIY component is going up all the time because the plumber we had
booked in to do the work is off long term sick and has decided to retire.
So we are recruiting a new plumber (see previous post about Viessman
boilers) but meanwhile the build must go on so I will probably be doing
the majority of the non-CH plumbing apart from installing and commisioning
the boiler.
[Could end up doing the CH as well, but first things first.]

[Possibly there will be queries about equipotential bonding and plastic
pipes to follow.]

Anyway, plastic 22mm cold water supply from the polypropylene mains to the
boiler in the first floor airing cupboard.

This will run past most of the locations for cold water feeds to basin
taps, showers, and toilets.

So as I see it I have two options:

(1) Tee off the 22mm as it goes past each location - this gives a neat
short overall pipe run with a lot of takeoffs from the feed to the boiler.
However there is the potential for a pressure drop along this feed as hot
and cold taps are turned on together, and toilets are flushed.

(2) Run a seperate 22mm or 15mm cold feed alongside the feed to the boiler
all the way back to the incoming main. This may reduce the pressure drop
in the hot water system when cold taps are used - which is the bane of
mains pressure systems such as electric showers and combi boilers.

More pipe, more complicated, but is it worth the effort?

Cheers


Dave R

--
Outlook Express within VMWare Player
Running under W7 64bit


--
No plan survives contact with the enemy.
[Not even bunny]

Helmuth von Moltke the Elder

(\__/)
(='.'=)
(")_(")

David WE Roberts wrote:
Getting myself ( as usual) overly complicated in my planning for the
plumbing.
The DIY component is going up all the time because the plumber we had
booked in to do the work is off long term sick and has decided to
retire. So we are recruiting a new plumber (see previous post about
Viessman
boilers) but meanwhile the build must go on so I will probably be
doing the majority of the non-CH plumbing apart from installing and
commisioning the boiler.
[Could end up doing the CH as well, but first things first.]

[Possibly there will be queries about equipotential bonding and
plastic pipes to follow.]

All circuits that enter the bathroom on and RCD oir RCBO and no problems.

Anyway, plastic 22mm cold water supply from the polypropylene mains
to the boiler in the first floor airing cupboard.

This will run past most of the locations for cold water feeds to
basin taps, showers, and toilets.

So as I see it I have two options:

(1) Tee off the 22mm as it goes past each location - this gives a
neat short overall pipe run with a lot of takeoffs from the feed to
the boiler. However there is the potential for a pressure drop along
this feed as hot and cold taps are turned on together, and toilets
are flushed.
(2) Run a seperate 22mm or 15mm cold feed alongside the feed to the
boiler all the way back to the incoming main. This may reduce the
pressure drop in the hot water system when cold taps are used - which
is the bane of mains pressure systems such as electric showers and
combi boilers.

No. 2. Have a dedicated 22mm pipe to the combi. Tee off at the maintap with
the cold water pipes to all the cold water outlets.Have a full bore maintap.

The cold to the shower? Tee off the 22mm cold feed to the combi just before
the combi. Use this for the cold to shower mixer. If the pressure/flow goes
down on the com,bi, the hot and cold to the shower are near equally
affected.

More pipe, more complicated, but is it worth the effort?

Cheers


Dave R