I've just fitted a new basin with a monobloc tap and the water flow rate is
very poor. The previous sink with standard separate taps connected to the
same supplies worked fine. I notice that he tap tail pipes are only 10mm
and the entry into the tap is 8mm diameter. Are all monobloc taps like
this? It seems to me no wonder that the flow is poor when the input 15mm
pipes get squashed down to 8mm. My feed is gravity with maybe 6 feet of
So, are there different monoblocs which give a better flow, or have I just
made a bad choice?
If there is no way of making the supply tails any wider diameter, then it's
just bad choice. With only a low head of water it isn't really enough to
give the pressure needed to push water through such narrow pipework, and no
gain would be made at all in even taking larger diameter pipe closer to the
tap either. Is there any way you can fit a dual flow pump to the supply
If fitted with a demand switch, this would raise the pressure to all your
taps if fitted on the outlets of your hot and cold storage tanks.
Is this true? Speaking as an ex-physicist rather than as a plumber, if I
(say) halve the length of the low-diameter pipe, I've halved the
friction caused by the reduction in bore, so the flow rate should be
half-way between what it was and what it is now. Assuming that the
reduction in flow is caused by the small-bore pipe, of course.
Not going in to the full physics of it, but it wouldn't make the huge
difference in flow from the taps that Roger is after, mainly due to the
inlet ports on the base of the monobloc tap body being that much smaller
than the bore of the pipe. So in this case, even taking the larger diameter
pipe right up to the inlet ports, it would still causes a big enough
restriction to reduce the flow rate from the tap.
Pumps when there is no need to! There are high pressure and low pressure
taps. This is obviously a high pressure tap set on a low pressure system.
Get the right taps for the right job.
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