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I. General Information
A.
Terminology In This Manual
Boiler:
Refers to the Nature’s Comfort boiler.
Furnace:
Refers to the existing indoor gas or oil fired unit which heats the air or radiant water
heat for the home.
B.
Clearance to Combustibles Required
Top, Front, Rear and Sides:
36
”
Flooring:
Non-Combustible
C.
Boiler Dimensions & Specifications
NCB-120
160,000 BTU, 120-gallon water tank, 3,000 sq ft.*
COAL
42"x63"x86" tall, 1652 lbs
NCB-175
220,000 BTU, 175-gallon water tank, 4,000 sq ft.*
COAL
46.5"x60"x90" tall, 1817 lbs (3/8” firebox)
NCB-250
300,000 BTU, 250-gallon water tank, 6,000 sq ft.*
COAL
46.5"x78"x90" tall, 2260 lbs (3/8” firebox)
NCB-275G
400,000 BTU, 275-gallon water tank, 8,000 sq ft.*
COAL
50"x73"x89" tall, 2113 lbs
NCB-325G
460,000 BTU, 325-gallon water tank, 10,000 sq ft.*
COAL
50"x85"x89" tall, 2313 lbs
NCB-400G
500,000 BTU, 400-gallon water tank, 12,000 sq ft.*
COAL
50"x85"x96" tall, 2613 lbs
*
Will heat up to (x)sq ft (This must include all heated areas of home as well
as basement.) with proper installation, properly insulated building and
when dry coal is used.
Deduct a minimum of 500 sq ft if heating domestic hot water.
Firebox Sizes
Model (Coal) Cu/Ft
Description
Width
Depth Opening
Ash Pan
NCB-120
15.0cu/ft
oval
25.5”W x 31”H 36”
21.75”W x 22”H
39” X 11.75”X 4”
NCB-175
13.5cu/ft
29” cylinder
29.25”
36”
25.75”W x 17.75”H
39” X 11.75”X 4”
NCB-250
20.5cu/ft
29” cylinder
29.25”
54”
2
5.75”W x 17.75”H
39” X 11.75”X 4”
NCB-275G
23.4cu/ft
oval
30”Wx36”H
42”
27”W x 25.5”H
39” X 11.75”X 4”
NCB-325G
28.5cu/ft
oval
30”Wx36”H
54”
27”W x 25.5”H
39” X 11.75”X 4”
NCB-400G
40.0cu/ft
oval
30”Wx46”H
54”
27”W x 25.5”H
39” X 11.75”X 4”
Steel thickness
Model (Coal)
Water Jacket
Firebox
NCB-120
10ga. (approx. 1/8
”)
¼
”
NCB-175
7ga. (approx. 3/16”)
3/8” or ¼”**
NCB-250
7ga. (approx. 3/16”)
3/8” or ¼”**
NCB-3275G
7ga. (approx.
3/16”)
¼”
NCB-325G
7ga. (approx. 3/16”)
¼”
NCB-400G
7ga. (approx. 3/16”)
¼”
**
Firebox thickness depends on option ordered by customer
