Does a shower which will be supplied from a HW tank and mains fed cold water
always require a dedicated connection to the HW tank?
The HW tank is located in the basement and the cold storage tanks are in the
loft (i.e plenty of head). There will be a shower in the basement near the
HW tank and there is currently a 22mm pipe off the HW tank which runs pass
the location of the proposed shower to the bathroom above (where it feeds a
bath, sink, shower[not installed yet]).
Would it be more appropriate to run a new 22mm pipe from the HW tank for the
two new showers and nothing else?
With mains fed cold water to all the taps, then you'll need as much flow of
hot water to the showers as possible. I'm assume the showers are mixer
valve style. In the winter months, the cold water supply will take a lot of
heating up, and this might take a lot of the pressure out the shower head
because the cold supply will be almost turned off.
If the one 22 mm pipe is feeding all the other appliances, then will, or is
there a chance that, the other appliances will be used at the same time as
the showers ? Like if someone is in the shower, will anyone else be able to
run the hot water in the wash basin ?
You will need as much hot water going to each appliance as you possibly can,
so if this means taking a separate supply pipe to each appliance, then this
is the best solution.
If you've ever been in a gents toilet where the trough is rinsed by a pool
pipe, then the concept is the same. One large pipe feed lots of smaller
pipes. So if you take the largest diameter pipe as close to each appliance
as possible, then the appliance is able to take the flow it needs without
being to restricted.
The problem comes when someone else uses hot water from the same pipe as
your shower, causing an unpleasant cold sensation to occur.
If you think this is unlikely to occur, or you're prepared to live with
it, then you could use the existing pipe.
You might also want to feed the shower cold from the cold water storage
tank rather than the mains, otherwise if anyone in the house uses cold
water the shower can get very hot very suddenly.
Nowhere near fast enough. You can still get your botty burnt or frozen.
I speak from experience here. It will adjust back to the right
temperature within about 5 seconds, just in time for the other person to
turn the water off again, then you get the opposite effect. You can
usually tell by the noises emitted from the shower user whether it has
been a cold/hot experience or a hot/cold one.
The shower must have its hot water from the cylinder and the cold from the
tank, unless you are fitting a venturi shower, which can have its cold from
the cold mains and hot from a low pressure cylinder. Here is an
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Why mains cold and tank hot? That's what I found when I moved into my
present house and
the variations in mains cold pressure made it a b*gger to set the right
temperature even on a
How about cold-tank cold and hot-tank hot?
When I moved my hot tank some time ago (google will archive all the
tribulations about the move) I
replaced the 22mm feed to the tank with 28mm, and also replaced the 22mm
28mm which then descended a couple of metres to a T-piece where either side
Thus there is bit more current down to the tank to keep it supplied, and you
any other draw-offs when you are in the shower.
Just my experience.
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