We live in a flat and, having just replaced the kitchen sink and taps, find
that what was already a low flowrate at the hot water tap has been made
somewhat worse, a litre of water now taking about 20 seconds to deliver.
The problem originates with the limited head of water (about 2 metres) and
is exacerbated by the small-bore tap connectors (which replace the previous
direct 15mm connection. Cold water is at mains pressure, which is good
(about 5 seconds to deliver a litre at the kitchen sink).
Is it viable to pump the hot water to the kitchen sink? Cold water feed to
the header tank delivers a litre in as little as a couple of seconds so
there's little risk of running the (approx 250 litre) tank dry.

TIA

nog wrote in
:

The problem originates with the limited head of water
(about 2 metres) and is exacerbated by the small-bore tap connectors
(which replace the previous direct 15mm connection. Cold water is at
mains pressure, which is good (about 5 seconds to deliver a litre at
the kitchen sink). Is it viable to pump the hot water to the kitchen
sink? Cold water feed to the header tank delivers a litre in as little
as a couple of seconds so there's little risk of running the (approx
250 litre) tank dry.

I use a Grundfos Home Booster pump for this and am very happy with it.

If you can fit it direct to the outlet of your HW tank it will boost bath
and sink as well.

YOu need a good pipe run from the Cold tank to the hot tank, ie unimpeded
22mm, full bore valves, etc, to be sure of not sucking air in, but you
should have that already

mike

On 14 Sep 2005 09:10:17 GMT, mike ring wrote:

nog wrote in
:

The problem originates with the limited head of water
(about 2 metres) and is exacerbated by the small-bore tap connectors
(which replace the previous direct 15mm connection. Cold water is at
mains pressure, which is good (about 5 seconds to deliver a litre at
the kitchen sink). Is it viable to pump the hot water to the kitchen
sink? Cold water feed to the header tank delivers a litre in as little
as a couple of seconds so there's little risk of running the (approx
250 litre) tank dry.

I use a Grundfos Home Booster pump for this and am very happy with it.

If you can fit it direct to the outlet of your HW tank it will boost bath
and sink as well.

YOu need a good pipe run from the Cold tank to the hot tank, ie unimpeded
22mm, full bore valves, etc, to be sure of not sucking air in, but you
should have that already

And complete with automatic flow-sensing switch! Now on order from Travis
Perkins. An ideal solution - thanks for that. :-)

nog wrote in
:

And complete with automatic flow-sensing switch! Now on order from
Travis Perkins. An ideal solution - thanks for that. :-)

Hope it makes you as happy as it's made me

mike

mike ring wrote in
. 1.4:

I fergot to say, it comes with a couple of 1/2" pipe converters IIRC, I
presume to get into 15mm pipework.

If you're going into 22mm, trash them, and get a couple of 3/4" to 22mm
compression convertors.

I hope I've got the details right, but you'll see what I mean.

I had to scratch my head for quite a time, as I thought they were
compulsory

mike

In message , nog
writes

We live in a flat and, having just replaced the kitchen sink and taps, find
that what was already a low flowrate at the hot water tap has been made
somewhat worse, a litre of water now taking about 20 seconds to deliver.
The problem originates with the limited head of water (about 2 metres) and
is exacerbated by the small-bore tap connectors (which replace the previous
direct 15mm connection. Cold water is at mains pressure, which is good
(about 5 seconds to deliver a litre at the kitchen sink).
Is it viable to pump the hot water to the kitchen sink? Cold water feed to
the header tank delivers a litre in as little as a couple of seconds so
there's little risk of running the (approx 250 litre) tank dry.

Maybe the heat exchanger in the boiler is scaled up or you have a
blockage depending on the type of heating you have

--
geoff

On Wed, 14 Sep 2005 21:28:54 GMT, raden wrote:

In message , nog
writes

We live in a flat and, having just replaced the kitchen sink and taps, find
that what was already a low flowrate at the hot water tap has been made
somewhat worse, a litre of water now taking about 20 seconds to deliver.
The problem originates with the limited head of water (about 2 metres) and
is exacerbated by the small-bore tap connectors (which replace the previous
direct 15mm connection. Cold water is at mains pressure, which is good
(about 5 seconds to deliver a litre at the kitchen sink).
Is it viable to pump the hot water to the kitchen sink? Cold water feed to
the header tank delivers a litre in as little as a couple of seconds so
there's little risk of running the (approx 250 litre) tank dry.

Maybe the heat exchanger in the boiler is scaled up or you have a
blockage depending on the type of heating you have

Thanks for the suggestions but, no, it's definitely as described - and made
worse by a 22mm feed most of the distance from the cylinder to the sink,
which makes the arrival of the h/w a bit long-winded.
Flow at other taps (2 bathroooms and 1 vanity unit) is not conspicuously
low.

On 14 Sep 2005 20:08:48 GMT, mike ring wrote:

mike ring wrote in
. 1.4:

I fergot to say, it comes with a couple of 1/2" pipe converters IIRC, I
presume to get into 15mm pipework.

If you're going into 22mm, trash them, and get a couple of 3/4" to 22mm
compression convertors.

I hope I've got the details right, but you'll see what I mean.

I had to scratch my head for quite a time, as I thought they were
compulsory

Thanks Mike - no doubt it will become clear when the pump arrives.