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
news:l46wgqc2gtvu.hhp6m6wgzvd.dlg@40tude.net: 

 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
> news:l46wgqc2gtvu.hhp6m6wgzvd.dlg@40tude.net: 
> 
>  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
news:yzy3hmq41t3p.13t5szs8q8fdj.dlg@40tude.net: 

> 
> 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 
news:Xns96D1D45F71A6Bmikeringbtinternetco@130.133.1.4:

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


> mike ring  wrote in 
> news:Xns96D1D45F71A6Bmikeringbtinternetco@130.133.1.4:
> 
> 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.