indirect or direct unvented water heater

I have a pretty new combi boiler but it is too far away from out -lets (down in garage) takes ages for hot water to get though,no tank in combi.
So can anyone tell me if I would be better off puting indirect unvented heater next to/off combi or fit direct heater in lobby next to kitchen.
There is water and leky in lobby. Thanks for any help

Could u not get the combi moved?

no. to close to windows for outlet and pipe work would take it back same distance nearly. and cost about £2,000 anyway..
I could fit it myself but have never done one to work off boiler. not shure how it works in conjunction with combi..
Thanks for reply.