Brochure
BUDERUS
Cast Iron Boilers
G215 – G315 Series
G315 Series
6
Model G315/5 G315/6 G315/7 G315/8 G315/9
Performance Data
Gross Output (MBH) 350 454 559 663 768
# of Sections 5 6 7 8 9
Max. Input Gas (MBH) 433 556 678 801 924
Max. Input Oil (GPH) 3.0 3.85 4.7 5.6 6.4
Net IBR (MBH) 304 395 486 577 668
Boiler HP 10.4 13.6 16.6 19.8 22.9
Max. Operating Pressure (psi) 87 87 87 87 87
Combustion Efficiency Oil 86.8% 86.9% 87% 87.1% 87.1%
Combustion Efficiency Gas 84.2% 84.3% 84.4% 84.4% 84.5%
Thermal Efficiency Oil 83.3% 84.3% 84.9% 85.4% 85.7%
Thermal Efficiency Gas 80.8% 81.8% 82.4% 82.8% 83.1%
Number of Sections 5 6 7 8 9
Piping Connections
Vent Connection Size, in 7
Supply, in 3
Return, in 3
Physical Dimensions
Overall Boiler Length, in 44
19
/
64
50
19
/
32
56
57
/
64
63
3
/
16
69
31
/
64
Boiler Block Length, in (LK) 38
3
/
16
44
31
/
64
50
25
/
32
57
3
/
32
63
25
/
64
Boiler Door Thickness, in 5
Minimum Boiler Width, in 28
Height, in 40¾
Fire Box Depth, in 31 37½ 43¾ 50 56¼
Fire Box Diameter, in 15¾
Fire Box Volume (cu. ft.) 5.19 6.39 7.59 8.79 9.99
Dry Weight (lbs.) 1,197 1,391 1,585 1,779 1,973
Water Content (gal.) 37.8 45.2 52.6 60.0 67.4
Operating Weight (lbs.) 1,512 1,768 2,024 2,280 2,545
Front View Side View
L
34
41
/
64
"
40 ¾"
¾" Drain
7"
1"
36
59
/
64
"
32
13
/
64
"
25 ¼"
12"
36"
11 ¼"
6
7
/
64
"
17
23
/
32
"
max
9"
L
K
Rear View
Supply
Return
Top View
Operational Requirements of the G315
❚ The boiler must be placed on a smooth,
level concrete base, 33½" wide.
❚ Cement in the base (or place on its top)
either 4" x ¼" flat steel plates or 4" x 2"
x ¼" angle irons for boiler support.
❚ Set boiler high limits above 122°F (149
°F for modulating gas burner) for safe
boiler operation.
❚ Low fire setting must be at least 60%
of full fire for a LHL burner.
❚ Maintain minimum of 158°F in the
boiler in case of ice water return
temperatures.
❚ Buderus recommends the use of
customized Beckett or Riello F series
burners when firing the G315 with oil.
(Available from Buderus.)
❚ Use Power Flame or Riello for gas
firing. (Available from Buderus.)
Approval numbers are subject to periodic changes and updates.
Please visit www.buderus.us for the most up-to-date approval numbers.
MEA APPROVED
CRN APPROVED