On Sun, 4 Aug 2019 19:48:34 -0700 (PDT), wrote:

Used furnace 800,000 how much you going to give me for it
You sure it's not 80,000 BTU? 800,000 would be gross overkill for
most homes - and many commercial/institutional building as well.

Generally any furnace over 10years old is worth about 3 cents a pound
on a good day.