Do I need a negative head pump, and can you recommend one

[boringgit]

So I live in a 70s flat with pretty low ceilings and therefore a pretty crappy head of water.

I recently replaced my leaking kitchen tap with a ne one which has a sort of goose neck shape - being higher, this has reduced the awful trickle of hot water which I used to get from the tap down to a true dribble. I now get about 300ml per minute - I would guess that the old tap was perhaps 600ml - still pretty bad.

The pressure in the bathroom sink is just adequate and the shower already has a pump. All I want to do is to give the kitchen hot tap a bit more power - most of the pumps I see seem designed for showers and I really don't need that much pressure. I'd also like to keep it local to the sink, because it appears that the shower and the kitchen tap draw from the same feed, and the shower pump works well so I'd rather not break it!

I'd also rather not spend too much money as we might need to move soon and I dont think It would add to the value of the flat.

Any advice? Thanks in advance!

 

[Dan Robinson]

The gooseneck will have naff all to do with the reduced flow in terms of less head.

The tap design or twisted flexi hoses will have more to do with it.

 

[boringgit]

Hoses seemed pretty much the same in diameter - although I can only guess at the internal bore.

Sorry - I didn't explain why i mentioned the tap style - which was that I guess the taller tap (by about 20cm) reduces the head further? It is now about 70cm from the top of the tap, to the water level in the cold tank.

 

[Nozzle]

The loss of head is only 20 mbar, so that won't have caused such a dramatic change in flow - are the tap valves designed for high pressure use only?

Nozzle

 

[Dan Robinson]

It's the internal bit that's important as well as the tap design.

The ponsier they look the less suitable they are for low pressure systems.

If you're selling, take them back and get a basic contract set suitable for 0.1bar.

 

[boringgit]

Just had a look and it says minimum pressure 1 bar.

Selling is not for certain, but it is a distinct possibility so I don't want to spend too much. It's a 1 hole, mixer affair - and the sink has only the one hole - do you know if I can get a mixer tap with such low pressure to fit a single hole?

 

[boringgit]

OK - I can see some.

Thanks for your help!

 

[Dan Robinson]

No worries.... very common problem especially with flats.