Combi Boiler swap

Altior

I had my gas boiler from new, as it came with my new build in 2010.

I am planning to head off a total fail, and after 15/16 years of use it is now quite noisy and has needed repairs over each of the last three years. I am however due a service that I have paid for within a few weeks. So I feel like it will be a good time to have a new one installed before the winter. Property is essentially 1 bed flat, 5 rads and very well insulated property.

Priority is quiet operation as my living room and kitchen are combined, and the boiler is sighted in the kitchen part! I don't mind paying a modest premium if a more expensive one is tangibly quieter!

I ran the details through a supplier website, the suggested option that seemed decent:

Current: Potterton Promax Combi He Plus

Proposed: Worcester Bosch Greenstar 4000 25kw

Seemingly Boxt will supply and do all the fitting necessary.

I know absolutely nothing about boilers. I watched a Worcester Bosch Greenstar 4000 review on youtube, from unpacking etc. The key difference I noticed was that the big 4inch? pipe on the WB seemed to exit directly out of the back/middle, whereas mine has a pipe at the top a bit like a periscope, it goes out of the top first and then out through the wall.

Key questions are is this likely to be a suitable choice, will it be a direct swap, and do you just get the flue options that are appropriate. Common sense really, I wouldn't want to need a new hole made and have to somehow fill in the original one. Or do I need to find a new boiler that has the same design (the periscope style flue)?

Thanks !

WIAWSNB

I'm sure you'll find the 4000 to be perfectly suitable with its flue options.