Can anyone tell me please what positive/negative means in relation to a
Is the Salamander RHP75 good and reliable, and should we be looking at other
Stuart Turner have been recommended by a friend.
Salamanders are good and reasonably priced (about £120 for a 1.5 bar unit
suitable for a normal single shower from Screwfix). If you get water out
of the shower without a pump you only need a regular pump: if the shower
head's above the level of water in the storage tank then you need positive
head or a switch to start the pump (some models come with an air-operated
The diy faq wiki has an article on showers.
John Stumbles -- http://yaph.co.uk
My other sigs are posh
> Suppliers are recommending a Salamander RHP75.
> The use of the pump will be shower only, but we would like a quiet and
> reliable unit.
They are OK IIUC. Stuart Turner are usually thought of as being one of
> I have read a bit about shower pumps and do not understand the references to
> negative and positive. Some help here would be appreciated.
Your basic shower pump is activated by a flow switch. When you turn the
tap on, water flows, and that switches the pump. This means the pump
will only work where there is at least some positive pressure from
gravity feed alone to start things going.
If you need to feed a shower that is above the header tank level, you
need an alternative way to get the pump running - since opening the tap
alone would simply allow water to run away from the shower and air to
flow in via the shower head. These slightly more complicated setups are
negative head pumps.
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If you've got a 5m head, you don't need a pump. Get a 22mm fed
thermostatic shower - I have an Aqualisa one. Quite superb.
*When I'm not in my right mind, my left mind gets pretty crowded *
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
> tanks in loft. There is about 5m head to the shower.
She's given you enough head, and you don't need a pump to get it up
Worst was TechFlow QT80 leaked after 6 years (tripping RCD) then wanted �60
for new seals....
B&Q one had only 15mm pipes (was in house I bought) and continually
cavitated as it could get enough water in and out and was extremely noisy.
I got a 3.5bar Stuart Turner pump from http://www.plumb-warehouse.co.uk/ for
�300, arrived next day, which was �317 cheaper than my local plumber
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quite. A pipe is much quieter, much longer lasting and doesnt add
energy waste. And probably no more cost.
"NT" <meow...@care2.com> wrote in message
>> If you've got a 5m head, you don't need a pump.
> quite. A pipe is much quieter, much longer lasting and doesnt add
> energy waste. And probably no more cost.
One of my showers works OK and it only has 1.5m of head.