fixed shower head in a wet room

[bullseye123]

I am in the middle of building a wet room and as I have solid fuel heating ( no combi ) or immersion heater I rely on electric shower in the summer months...I don't want an electric shower showing in the shower area so I purchased ( zip inline electronically controlled instantaneous water heater CEX-O ) compatable with showers as the technical people tell me!.it has a max 5litre flow rate per min .
After asking numerous dealers,tech people,reps,plumbers and the good people at zip nobody can tell me if this water heater will be sufficient to have enough pressure for a 140mm upwards fixed shower head with a concealed shower valve.
Does anyone know the answer ?

kind regards

 

[Charnwood]

It's not pressure you need to factor in, it's flow rate.

It will work in as much as water will come out, but 5 lpm will not give much rain, more like drizzle.

 

[newbuildinstaller]

answer no

 

[bullseye123]

its not wat I wanted to hear but thanx for that