Harold what about the “free air” for proper combustion if both appliances fire at once?
Is the existing flue piping large enough to properly vent both of these appliances at once?
Is the existing gas lines large enough to carry enough CU ft of fuel to all of this equipment what provisions are allowed for a spill switch to prevent the furnace from sucking in CO in case of spillage? Ah the joys of adding one appliance huh?
We better pull a jack and run to a home center clerk huh?