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Mod con and/or combi design help

Hello all has been awhile, I am a plumbing and heating contractor, I am not new to Mod cons but do mostly service and repairs, have installed several dozen over the years, but have a project that's giving me some design issues.
Northern New Jersey
3 story building, single gas hot water ci boiler, single zone of ci radiators. 1930 construction, single pane windows. 75 gallon gas water heater.
3 apartments total, 1st and second have 2 full bathrooms and 3 bedrooms so possibility of both showers going same time.
Customer wants:
1. Separate all 3 units heat and dhw.
2. Change to baseboard emitters, does not like the exposed piping and ci radiators.
3. get rid of chimney / make more room and save cost of liner.
4. Move boiler location to secure back mechanical room, he was thinking combi units
( room may be to tight for 3 boiler indirect combs)
Customer is a little flexible and willing to pay for the right job.
My issues, with quick math looking at 53,382 max load per larger unit, most likely on 2 zones.
Would like to stay with quality unit that has good support in the area, im not one to install and leave.
Problem comes in with a possible 4 gpm dhw of the two showers, and not sure if I would have enough room for larger indirect tank.
Thoughts on a particular unit?
Northern New Jersey
3 story building, single gas hot water ci boiler, single zone of ci radiators. 1930 construction, single pane windows. 75 gallon gas water heater.
3 apartments total, 1st and second have 2 full bathrooms and 3 bedrooms so possibility of both showers going same time.
Customer wants:
1. Separate all 3 units heat and dhw.
2. Change to baseboard emitters, does not like the exposed piping and ci radiators.
3. get rid of chimney / make more room and save cost of liner.
4. Move boiler location to secure back mechanical room, he was thinking combi units
( room may be to tight for 3 boiler indirect combs)
Customer is a little flexible and willing to pay for the right job.
My issues, with quick math looking at 53,382 max load per larger unit, most likely on 2 zones.
Would like to stay with quality unit that has good support in the area, im not one to install and leave.
Problem comes in with a possible 4 gpm dhw of the two showers, and not sure if I would have enough room for larger indirect tank.
Thoughts on a particular unit?
0
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Langans Plumbing & Heating LLC
732-751-1560
Serving most of New Jersey, Eastern Pa .
Consultation, Design & Installation anywhere
Rich McGrath 732-581-3833
With all that can anybody help with my actual question.
Thank you for any help.
Fewer parts so less to break down.
Fits almost anywhere.
http://ibcboiler.com/ibc-products/dc-series/
As w/ any combi DHW load will make the heat load oversized....
I am told they have another unit coming out this summer that will have a smaller heat load but a higher output DHW coil.
As with tankless i think most families would need at least a 160K unit. That can get lopsided with the heat load, however.
trainer for Caleffi NA
The magic is in hydronics, and hydronics is in me
if you want I could assist on this with you as I live in Linden and certified on both companies
What brand does your go to wholesaler stock and sell? Does the wholesaler stock parts.
I work for F W Webb we sell Rinnai, Bosch, Navien and HTP combi boilers. Also Burnham is coming out with a combi boiler in May and I believe W/M will have a combi boiler later this year.