Is 40k btu unit the same as 40k btu furnace?

Old 12-07-22, 08:28 AM
Thread Starter
Join Date: Jan 2008
Location: West of Chicago
Posts: 329
Upvotes: 0
Received 1 Upvote on 1 Post
Is 40k btu unit the same as 40k btu furnace?

In terms of gas usage and heat output?
I'm considering either an attic mounted furnace or hanging unit heater for my garage shop.

If both heaters are rated at 40k input btu, will they use the same amount of gas to heat the space?

80% furnace and seperated combustion unit heater.
Old 12-07-22, 09:16 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 27,376
Received 1,709 Upvotes on 1,526 Posts
Multiply the burner's btu output by the efficiency and that's how much heat you will get in the room. And, 40k btu of gas burned is 40k btu of gas burned so it all comes down to the unit's efficiency to determine which will consume less gas to heat the space.
Old 12-07-22, 10:35 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 65,125
Received 3,339 Upvotes on 2,998 Posts
Although the amount of heat produced will be very similar between units.... the furnace with the ducts will distribute the heat better making it more effective.

Thread Tools
Search this Thread
Ask a Question
Question Title: