Combi conversion and existing Shower pumps!

[RoryD]

Bit of a problem. Customer wishes to upgrade Potterton Flamingo for a Worcester Combi.
She has a Salamander pearl 70 twin shower pump. I've highlighted the issue regarding water flow and that it may not be possible to achieve as good a flow with a combi. Didn't have a flow cup so couldn't really confirm flow at present.
I understand from other posts that flow averages at about 15 ltr/min not sure if that's correct, but the Greenstar 28 cdi doesn't actually equate to that. Am I unduly worrying.
The alternative is to keep a regular boiler but of course she has her heart set on a combi!! What would be the best advice?
Cheers chaps

 

[SimonG]

Measure the flow and pressure and go from there.

 

[lame plumber]

my understanding is that shower pumps and combis are a no no. I just whip em out and wack on the mains pressure/flow having checked its sufficient for a combi to work