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question regarding boiler+hot water heater and chimney liner
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.