Hello

Going to plumb in an Aqualisa Axis Digital pumped shower.

Part of run is going to be in an area difficult to work with relatively
inflexible copper pipe. It will be run in 15mm. Total run to control
unit is about 4m for hot with probably 4 right angle bends and a service
valve. Cold is a bit less.

If I use speedifit will the inserts needed at each coupling reduce the
flow sufficiently to cause a problem.

Gravity system in house with almost 2m head to shower which my other
half does not consider gives enough pressure.

TIA for any replies.

Ps. House has TT installation with 30mA RCDs covering all the circuits.
All existing copper pipes in bathroom have good electrical connection to
main bonding. No bonding between bathroom items.
The shower rail assembly is metal and will be on the end of speedifit
plastic pipe. Is this OK with no additional earth?

On 17 Apr, 14:58, Invisible Man wrote:
Hello

Going to plumb in an Aqualisa Axis Digital pumped shower.

Part of run is going to be in an area difficult to work with relatively
inflexible copper pipe. It will be run in 15mm. Total run to control
unit is about 4m for hot with probably 4 right angle bends and a service
valve. Cold is a bit less.

If I use speedifit will the inserts needed at each coupling reduce the
flow sufficiently to cause a problem.

Gravity system in house with almost 2m head to shower which my other
half does not consider gives enough pressure.

TIA for any replies.

Ps. House has TT installation with 30mA RCDs covering all the circuits.
All existing copper pipes in bathroom have good electrical connection to
main bonding. No bonding between bathroom items.
The shower rail assembly is metal and will be on the end of speedifit
plastic pipe. Is this OK with no additional earth?

If you remember that mains water pressure is at least 2 bar and that
you are now putting in a shower with a 1/5 bar pressure, I do really
rather sympathise with your wife. I would suggest you think again
about your installation as you are only going to get a dribble (where
*is* he nowadays by-the-way?)

Rob

Rob G wrote:
On 17 Apr, 14:58, Invisible Man wrote:
Hello

Going to plumb in an Aqualisa Axis Digital pumped shower.

Part of run is going to be in an area difficult to work with relatively
inflexible copper pipe. It will be run in 15mm. Total run to control
unit is about 4m for hot with probably 4 right angle bends and a service
valve. Cold is a bit less.

If I use speedifit will the inserts needed at each coupling reduce the
flow sufficiently to cause a problem.

Gravity system in house with almost 2m head to shower which my other
half does not consider gives enough pressure.

TIA for any replies.

Ps. House has TT installation with 30mA RCDs covering all the circuits.
All existing copper pipes in bathroom have good electrical connection to
main bonding. No bonding between bathroom items.
The shower rail assembly is metal and will be on the end of speedifit
plastic pipe. Is this OK with no additional earth?

If you remember that mains water pressure is at least 2 bar and that
you are now putting in a shower with a 1/5 bar pressure, I do really
rather sympathise with your wife. I would suggest you think again
about your installation as you are only going to get a dribble (where
*is* he nowadays by-the-way?)

Rob

Regret my original post was apparently unclear.

House has a gravity fed system from tank in loft.

Shower was previously un-pumped. (Weak but far from useless)

New Aqualisa is to be pumped. (AXDE2A)

Invisible Man wrote:

Going to plumb in an Aqualisa Axis Digital pumped shower.

This is one with a pump in the main shower unit I take it? (aka a power
shower, rather than a remote pump feeding an ordinary mixer)

Part of run is going to be in an area difficult to work with relatively
inflexible copper pipe. It will be run in 15mm. Total run to control
unit is about 4m for hot with probably 4 right angle bends and a service
valve. Cold is a bit less.

If I use speedifit will the inserts needed at each coupling reduce the
flow sufficiently to cause a problem.

A short length restriction has far less impact than a long one - so the
inserts should make little difference.

Gravity system in house with almost 2m head to shower which my other
half does not consider gives enough pressure.

Understandably. To get something acceptable with so little head requires
careful planning - nice straight runs of 22mm pipe and a shower designed
for low pressure.

A pump will certainly help - although it would work better at the
beginning of the run of pipe than at the end. Otherwise there will come
a point that a powerful pump will just cavitate.

TIA for any replies.

Ps. House has TT installation with 30mA RCDs covering all the circuits.
All existing copper pipes in bathroom have good electrical connection to
main bonding. No bonding between bathroom items.
The shower rail assembly is metal and will be on the end of speedifit
plastic pipe. Is this OK with no additional earth?

Yup. It can't bring a potential into the room, so nothing to worry about.


--
Cheers,

John.

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