I am fitting a Damixa Apollo monobloc tap from B&Q to my sink.

I stupidly lost one of the copper tails for connecting to the water
supply (seem to be a completely non-standard 13mm connector!) - so
decided to just connect it to the cold water supply for now.

Problem is that when I turn on the tap, the water leaks heavily from
the socket where the hot-water connector is to be screwed into.

Is this expected?

If the cold water is at mains pressure and the hot water is coming
from a tank - could this cause cold-water to be forced back into the
HW tank?

Mark.

On 08/10/2007 10:31, wrote:

If the cold water is at mains pressure and the hot water is coming
from a tank - could this cause cold-water to be forced back into the
HW tank?

That is why one-way valves are "required", though the water board is
more interested in being sure your hot water can't make it the other way.

You lose a lot fo flow rate with the non-return vales though, so you
might prefer to find a coaxial mixer so the hot and cold stay separate
right to the spout.

On 2007-10-08 10:31:10 +0100, said:

I am fitting a Damixa Apollo monobloc tap from B&Q to my sink.

I stupidly lost one of the copper tails for connecting to the water
supply (seem to be a completely non-standard 13mm connector!) - so
decided to just connect it to the cold water supply for now.

Problem is that when I turn on the tap, the water leaks heavily from
the socket where the hot-water connector is to be screwed into.

Is this expected?

Yes. Have you checked that the tap is intended for use on low
pressure hot water? Damixa is (was?) a Danish manufacturer, so it
would not be surprising if the tap is intended for mains pressure cold
and hot water.

You may also find as a result that the HW flow, once connected is very slow.



If the cold water is at mains pressure and the hot water is coming
from a tank - could this cause cold-water to be forced back into the
HW tank?


Potentially yes. The high pressure taps often do the mixing in the
body of the tap whereas the LP ones tend to have concentric tubes and
mixing is at the outlet. This is also for the benefit of water
regulations where there is concern that hot water (potentially
contaminated) can find its way into the main.

I would begin by checking into the tap type and going from there.

On 08/10/2007 12:34, Andy Hall wrote:

Yes. Have you checked that the tap is intended for use on low
pressure hot water? Damixa is (was?) a Danish manufacturer, so it
would not be surprising if the tap is intended for mains pressure cold
and hot water.

when you read the Damixa destructions they do recommend they are only
for mains pressure hot,

You may also find as a result that the HW flow, once connected is very
slow

I didn't risk it, I returned the Damixa for a Franke Olympus, gives good
hot flow, obviously mains presure cold can dominate the hot if you let
it, but controls are good.