The easiest and best way to establish your BTU requirement
is to look at your
There is normally a label on the furnace that tells you the BTU
If your furnace is 90% efficient, you may have to multiply that
amount by 0.90.
If there isn't as label affixed, call the manufacturer or go to their website with your
and they will tell you the rating.
Any furnace rated at 180,000 BTU NET output or less, can be
replaced with our NCB-120,
assuming that it heats your home well now.
Of course if a furnace is
oversized (e.g 100,000) and can really
heat your home with 80,000 BTU, then that should be considered. Use
square footage estimates below.
Doubling the furnaces output (buying a bigger model)
has great benefits to you,
like loading less often!
There is no negative to getting a bigger furnace because it is not
an air conditioner where if you get one too big, it becomes
It is simply like getting a bigger fuel tank or propane tank,
so that it will hold more fuel and you will need to fill it less
I got one size bigger for my home and I only load it once a day,
instead of twice
(normally once in the morning and once at night)
The NCB-120 STORES 120,000 BTU, ready for use, unlike others who
phony numbers of what a furnace can do at maximum output,
which may be 20 minutes.
Also remember, that the home should be no bigger than the rated square footage
unless in a southern climate like us in AR or in NC or further south.
But remember, it is more critical to have a heat exchanger with the
If the heat exchanger is too small, you will never get enough heat,
no matter how big the furnace is!
Select or input information on the first 4 lines
and then hit button to Calculate BTU