Hi I am currently in the middle of our bathroom refit, and have two questions.
I have purchased the aqualisa quartz digital pumped shower as we have, a gravity feed hot water cylinder. The problem I have is once I removed the bath it appears that the current cold pipe to the shower is feed from the mains.In the instructions for the shower it states:-

Installation of Digital pumped processor (for gravity stored systems)
The Quartz Digital pumped shower system is designed to operate up to maximum static pressure of 100kPa
((1 bar)(10 metres head)(14.5psi)).
Under no circumstances must the pumped processor be connected directly to the water main or in line with another booster
pump.

1) Is it possible to still use this pipe and fit a pressure reducing valve? As this would save me having to run a new pipe down from the cold tank in the loft.

2) If I can use the mains pipe what pressure should i set the valve to and is this dependant on the pressure of the hot feed?

Thanks in advance
Jon

Are you installing the shower over the bath?

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Verwood Handyman
I Know it says I'm On-line, but I might have just left myself logged in, whilst I'm out....

I don't think you can ... here is what I have learnt from asking very similar Qs in this forum. Your gravity fed will be 0.1 bar for each metre of height from the showerhead to the location of your cold water tank. You might have 1 metre height, 2 or 3 etc. Let's say less than 0.5 bar. I don't think there are any valves that would reduce mains pressure that low, there again I am not a plumber.

According to the spec you gave you need the pressure to drop to 1 bar (but you must check for how equal the hot and cold pressure ought to be too). There are a couple of valves here http://www.toolstation.com/shop/Plumbin ... d20/sd2696 but they only seem to reduce down to 1.5 bar.

Are you thinking that if you had to get a pipe from the cold tank to the bathroom you would have to go under the floor, under the bath etc? What if you left the bath as it is and brought in two feeds for cold and hot from above? Would that be any easier?

No. Run a new pipe from the processor/pump unit.

Does this shower have the hot and cold to the processor/pump, then just the one mixed outlet to the shower head?

With this shower you will also need balanced hot and cold supplies.

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Dave

www.drlgas.co.uk

In your earlier post, you showed the existing shower pump with a cold feed from the attic tank this would still be best for the Aqualiser to match the hot feed from the cylinder.

Thanks for the replies, I am also changing the bath and re tiling the whole room. I was just trying to save myself running the pipe from the cold tank to the bathroom. As aeromech pointed out in a previous post the old shower pump is feed from the cold tank, this pump is located in the main bedroom wardrobe at the front of the house unfortuntley.
This type of shower has a cold and hot feed then a single mixed output.

From the other posts It sounds best to just run the new pipe from the cold tank.