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17
Low NOx UNITS
Heater
Model
BTUH
Input
(000)
(A)
Cabinet
Width
(B)
Flue
Dia.
(C)
Indoor
Drafthood
(J)
Min. Gas
Conn.
Water
Conn.
Shipping Weights (lbs)
Standard
Heater
w/Stackless
Top
ASME
Heater
w/Stackless
Top
Indoor
Draft-
hood
R207A 199.5 20” 6” 55-5/8” 11-3/4” 3/4” 2” 174 193 12
R267A 266.0 23” 7” 56” 11” 3/4” 2” 197 216 15
R337A 332.5 26” 8” 57” 10-5/8” 3/4” 2” 219 238 17
R407A 399.0 29” 9” 58-1/2” 12-1/8” 3/4” 2” 237 256 20
Designation for a Digital heater using natural gas is “EN”.
Prefix “C” is for cast iron (ASME) headers; “P” is for plastic (polymer) headers.
Suffix “X” is for cupro-nickel tubing; “C” is for copper tubing.
EXAMPLE: P-R407A-EN-X = Plastic headers, 407 model size, digital, natural gas, cupro-nickel.
For altitudes above 5,000 ft., consult the factory.
For Canada, no de-rating is required for elevations up to 4500 ft.
Plastic (polymer) headers cannot be used for ASME installations.
B
C
INDOOR
DRAFTHOOD
31-13/16"
7-3/4"
GAS
CONNECTION
J
A
20-1/2"
(22-1/2" ASME)
26-1/2"
ELECTRICAL
CONNECTION
34"
STACKLESS
OUTDOOR TOP
28"
4-3/8"
(3-3/8" ASME)
8-7/8"
(6-5/8" ASME)
SPECIFICATIONS AND DIMENSIONS