Combis and vented cylinders?

[philamateur]

Had a new WB 37cdi (combi) installed three months ago as a replacement for very old Potterton heat only. Shower pressure is however useless (9 lpm). I've decided to reinstall gravity fed system after having ruled out system boiler due to poor mains water pressure (17.6 lpm) but I'm reluctant to scrap a brand new boiler. What I was hoping someone could advise me on was whether the WB 37cdi could be used as heat only and be rigged with an indirect vented cylinder? I've had conflicting advice, with two plumbers saying it can be done and another saying it can't and that I'll need a new boiler.
Anyway, hope someone can help. Thanks

 

[kevplumb]

yes it can be done

the normal approach is to use the combi hot water for the kitchen etc

wire the boiler through an "s" plan one zone for heating the other for the cylinder