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It's piped perfect. All of them are if the manual isn't read

This looks like the installer of that boiler just copied the piping arrangement of the old coal boiler that was removed. Left riser to one main and the Right riser to the other main. And that may actually work for many years. I guessing without the equalizer, there is a check valve on the wet return somewhere.

But since you posted this in Chimneys and Flues, the first thing I looked at was the water heater and the gas boiler venting connection to the chimney. That looks fine too.

So they want a price for an replacement boiler without allowing you to calculate the radiation EDR? I would answer that TEXT with " A lot " but that could change when I do some calculations after the onsite inspection. Then it could change to "Reasonable". Let me know how you want me to proceed.

These guys are on top of it. I would add to spec. a smoothwall ss liner so you do not have to de-rate it 20% for corrugated. Once done, perform combustion analysis to ensure proper function. If you get it fired up to 'steady state', whatever that means, take a draft pressure reading then shut off the gas quickly. If the draft rises stronger, the liner is undersized.

Make sure they put arrows on those passive MUA grilles so the air knows which way to go. Air is dumb and will observe pressure gradients. For instance, operating an open hearth fireplace could backdraft a borderline boiler.

Most fireplaces were built with undersized flues. To reline one, you need to remove the flue tile then install the properly sized insulated liner for a 2,100F rated installation. You are not required to insulate heater flues but consider whether its a cold exterior chimney vs. warm interior one. FYI, the sizing tables in the code are for interior chimneys only.

@2x_Tom, you mentioned that you have a "255k net". the word NET is important, because that means something in boiler sizing. Input can be as high as 350,000 input. and there is no way a boiler with that much gas input can be vented in a 5" diameter flue pipe.

There are several BTU ratings on every gas fired boiler.  there is the input.  That number is how you size the gas pipe and the vent system.  If you look at the PFG-6 boiler above, you can see that it has a 305k input number.   Now look all the way over to the Net I=B=R rating of 215k. That is the Net number you are talking about if you are using the correct terminology.  That boiler is slightly smaller than the 225 NET you stated in your original post.  If you look at the last column on the ratings, that heater requires an 8” vent.  So unless your chimney is over 50 feet tall, that 5” liner will not be able to properly vent that heating appliance.  

If you can get the manufacturer's specifications on your customer's boiler, then you can show the customer where the chimney company is mistaken.  Then you can let them deal with the problem.  You gave them the proper info and you deserve to be paid for that information.  The chimney Company is now responsible for getting the heater to vent properly with the work that they did and probably got paid for by now.  If the customer used a credit card, they may have some recourse.  Otherwise that chimney company will just walk away with the failed repair and keep the money.   

I stopped recommending chimney professionals and just told the customers to just look in the yellow pages for chimney repairs.  (Yellow Pages must be translated into Internet for today’s customers)