We have just had a bathroom re-fitted professionally. I would be interested
in your views re:
15mm Plastic pipe has been used extensively, is this better or worse than
copper? Does it need to be lagged ? (it isn't)
We have an inline extractor fan with light in the shower. The fan unit is
mounted about half way between the inlet and outlet, a run of about 3m. Does
this make any difference to the efficiency? Should the fan be mounted closer
to the shower?
Better IMH (and not plumber)O - unless a "Victorian Look" bathroom where
you want polished copper pipes to show. For dozens of reasons including
much lower thermal conductivity.
If you look at the fitting instructions for an inline extractor fan (eg
look in www.screwfix.com) you will see that they show the fan midway
along the run.. Not that it really matters, it won't have much effect on
the efficiency as the air flows are so low.
Sorry I can't help you with the extractor fan, but can with respect the
The heating engineer a few years ago installed a combi boiler for us and
linked the new pipework to the existing pipework from the old heating
system. In the bathroom, the water on the sink takes ages to get upto a
decent temperature and wthe bath, well, we decided to have showers instead.
I installed a new kitchen earlier this year and used plastic pipe
throughout. I connected it very near to the point that the heating engineer
did. In the kitchen the water is hotter faster and it stays hotter in the
pipes for longer. Some may say that I have short pipe runs, but this is not
the case, infact it was out with the old and in with the new.
If I wasn't leaving this house next week, I would put plastic plumbing to
the bathroom as well. Certainly going to use it in the new house.
The IEE's views may be a bit more useful:
"You do not have to earth plastic pipes.
Plastic pipes make for a safer electrical installation
and reduce the need for earthing. Festooning an
installation that has been plumbed in plastic pipe
with green and yellow earth wire is not necessary
and is likely to reduce the level of electrical safety
of the property, not increase it."
You are welcome - however, the link considers installations where there
are lengths of plastic pipe installed - not installations with copper
pipes and the odd plastic joint. It is a length of plastic pipe (even
when full of water) that provides a high resistance and thus limits the
severity of an electric shock. If you don't have a significant length of
plastic pipe then I would suggest treating it as all copper, as you
won't have the current limiting effect.
When I fitted a shower pump in the airing cupboard using plastic pipes to
"intercept" the hot and cold shower feeds, the shower pump leaflet advised
bonding the now isolated sections of copper pipe together.
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