Ecotec 937 has 20l/min flow rate at 35ºC rise, to match that you're looking at the Highflow 440CDi, which is a floor-mounted boiler. They also do the Highflow 550CDi which puts out 25l/min.
If you specifically want wall-mounted then the best they do is the Greenstar 42CDi @ 17.2l/min at 35ºC rise.
Just out of interest, why do you want WBosch specifically?
My prefered installer is more into W/Bosch & I like to read up on all the options.
Seems the correct term for these is storage combination boilers or hybrids.
I will be possibly able to locate it in the loft space (eves) as the house is a work in progress with a lot of catch 22's (kitchen going to be a utility room, back door way needed for a while where a ideal location for the bolier would be once the room converts + extension etc, etc)
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