Thank you,
The thing is the furnace is in the finished basent and the water boiler is in the garage.
The boiler is 2 years old, the furnace 18.
I bought the house 6 months ago, knew the furnace was old.
It might be impossible to fit the water heater where the furnace is now.
It might be too expensive to move the furnace in the garage.....
Thank you for the feedback, will look more into that.
For now I think I am going with a two stage york furnace at 4k including installation.