Chimney and Water Heater/Boiler Venting Question
I need advice about a couple things with my 1920 built home we bought.
First the chimney that carries the exhaust for my water heater and boiler is unlined currently, and it’s the original to the house. I turned off the boiler for the summer to save on my gas bill and the water heater is orphaned and not drafting properly without the boiler on.
Second my water heater is 13.5 years old and will need to be replaced eventually. I was considering going for a tankless unit and having my plumber vent the unit directly outside. I could also replace it with a standard atmospheric unit.
My questions is should the priority be relining the heating chimney which will run 3-4K most likely I was told or replace my water heater with a tankless unit and whole home filter( $5600 for the tankless and $2400 for the filter). My boiler will still be venting out the chimney either way.
I live in Long Island so prices are not cheap for this work.