Two shower pumps?

Joined
24 Nov 2013
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Location
Berkshire
Country
United Kingdom
Hi

As part of some ongoing renovation, I'm thinking of fitting a mira mode gravity pump fed shower. We already have a techflow qt80 pump servicing a single shower head. That pump is positive head, cited at the base of the HW cylinder and triggered by a flow switch. There is a flange fitted (the one that came with the pump) to the top of the cylinder. Pipework is copper 22mm to the mixer.
Now this new shower would be fitted like in the manufacturer diagram copied below. The question I have is how can I avoid either shower pump interfering with each other?
Even now with the flange in place, very occasionally if a regular (non-pumped) outlet is switched on the existing pump starts running for a second or so - it probably only happens every 3 months or so but is enough to worry me that maybe fitting this new pump (negative head?) in the loft might trigger the flow switch in the existing techflow every time it runs?

Any thoughts or advice most gratefully received !


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