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question regarding boiler+hot water heater and chimney liner

in Gas Heating
so our boiler needs to be replaced and I'm more than clueless on how this needs to be done. I've spoken with numerous people that confirm I need a new boiler and have had a few quotes and estimates. I also need a chimney liner placed. as per the chimney guy, we can put in a 6in stainless steel liner and with our 28ft chimney, this will be rated at about 214k btu. Our existing water heater is a 74gallon American Water Heater G62-75T75-4NV rated at a max of 75,100 btu. The boiler the boiler guy is suggesting is a Weil McLain CAa 5 cast iron standard efficiency boiler rated at a CSA Input (MBH) 140k. AFUE% 83.5. Net (MBH) 102k. DOE Heating Capacity 117k.
We are running these appliances into the same flue, on perpendicular sides of the chimney. They are less than 5 feet from the chimney itself. It is in an unfinished basement in New England (2500 sqft home). The total max of both boiler and water heater is 215,100 btu, slightly higher than what my chimney guy told me his "chart" said for the chimney liner capacity.
Are these appliances unsafe to put together into this flue? Or do I need to find a different boiler. Per the chimney guy, he can only fit a 6in liner in, nothing larger will go.
Thank you in advance.
We are running these appliances into the same flue, on perpendicular sides of the chimney. They are less than 5 feet from the chimney itself. It is in an unfinished basement in New England (2500 sqft home). The total max of both boiler and water heater is 215,100 btu, slightly higher than what my chimney guy told me his "chart" said for the chimney liner capacity.
Are these appliances unsafe to put together into this flue? Or do I need to find a different boiler. Per the chimney guy, he can only fit a 6in liner in, nothing larger will go.
Thank you in advance.
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Comments
What type of radiation do you have? Cast iron, baseboards?
You can choose to do what you want, but you cannot choose the consequences.
what are the issues with having a boiler too large (aside from cost I'd assume)?
and if this model is still recommended, would that capacity be too much for my chimney liner/flue?
Thank you
Your other alternative is to install the boiler and install an indirect water tank and heat it from the boiler. That way the chimney liner will work
But check boiler size that's most important
SlantFin has a free app that you can download to calculate your heat loss. Just enter the correct construction data and dimensions and it will do the rest.
You can choose to do what you want, but you cannot choose the consequences.