shower pump

[rossy2]

iam fitting a shower pump for a mixer shower i have run a 22mil pipe from cold tank to pump location next to hot cylinder and 2 pipes one hot one for cold from pump position to shower head what i would like to know is someone mentioned negative head how do i find out what pump i require cheers

[newboy]

The type of pump (negative/positive head) depends on the pump location

If your pump will be below the tanks supplying it then it should be positive head if it is above the tank(s) - eg in the loft then you need a negative head pump.

[Softus]

newboy wrote:

The type of pump (negative/positive head) depends on the pump location

Not usually it doesn't.

Quote:

If your pump will be below the tanks supplying it then it should be positive head...

Not necessarily.

Quote:

...if it is above the tank(s) - eg in the loft then you need a negative head pump.

Why do think this?

[RachelG]

HI,

can i know which shower pump did you buy and do you like it? (is it quiet and powerful??)

[pannierstan]

Softus wrote:

newboy wrote: The type of pump (negative/positive head) depends on the pump location Not usually it doesn't. Quote: If your pump will be below the tanks supplying it then it should be positive head... Not necessarily. Quote: ...if it is above the tank(s) - eg in the loft then you need a negative head pump. Why do think this?

How helpful Softus

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[Softus]

pannierstan wrote:

Trollity trollity troll.

[pannierstan]

Did I, dont remember that!

Stan

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[rossy2]

cheers mate for your quick reply my pump will be located below all tanks so positive it is thanks again

[Softus]

rossy2 wrote:

cheers mate for your quick reply my pump will be located below all tanks so positive it is thanks again

That isn't a reason for choosing a positive head pump.

What's the vertical distance between the base of the cistern and the shower head?

[rossy2]

i will check and reply b4 i get a pump cheers

[rossy2]

ref my last the height from the shower head to the bottom of the tank in the loft is just over two and a half foot. cheers

[Softus]

Hm. That's about 0.08 bar then - not a lot, but you should ask the pump manufacturer what the minimum recommended head is. If you're below that then a negative head pump would be the answer.

However, flow is also a factor, because the flow switch needs to actuate. If you can't be sure about that then you might be better off with a neg pump for this reason alone. The trouble is they're a lot pricier.

[NickStone]

RachelG wrote:

HI, can i know which shower pump did you buy and do you like it? (is it quiet and powerful??)

Rachel, I see you've posted this message in another thread, too. Just to let you know that the reason no-one's replied to you is probably because you've 'hijacked' someone else's question. See Rule 20 in the Forum rules. If you're still waiting for a reply, you might want to post your question in a new thread.

To any moderators who might be watching, I'm not trying to do your job. Just trying to be helpful.

[Softus]

NickStone wrote:

Just to let you know that the reason no-one's replied to you...

What?

[NickStone]

Softus wrote:

NickStone wrote: Just to let you know that the reason no-one's replied to you... What?

RachelG asked the same question in this thread, Softus: http://www.diynot.com/forums/viewtopic.php?t=93411&highlight=