Product Overview

G215 – G315
Cast Iron Residential Boilers
G315
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 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% 84.4%
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 7" 7" 7" 7" 7"
Supply 3" 3" 3" 3" 3"
Return 3" 3" 3" 3" 3"
Physical Dimensions
Overall Boiler Length (LG) 44¼" 50½" 56¾" 63¼" 69½"
Boiler Block Length (LK) 38¼" 44½" 50¾" 57" 63½"
Boiler Door Thickness 5" 5"
5"
5" 5"
Minimum Boiler Width (BE) 28" 28" 28" 28" 28"
Height 40¾" 40¾" 40¾" 40¾" 40¾"
Fire Box Depth (LF) 31" 37½" 43¾" 50" 56¼"
Fire Box Diameter 15¾" 15¾" 15¾" 15¾" 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 6 7. 4
Operating Weight (lbs.) 1,512 1,768 2,024 2,280 2,545
Approval Numbers
MEA 356-98-E
CRN No# 616.TC
Approvals and Certifications
Front View Side View
L
34 ¾"
40 ¾"
¾" Drain
7"
1"
37"
32 ¼"
25 ¼"
12"
36"
11 ¼"
7 ¾"
A+4"
A
17 ¾"
max
9"
G
L
K
L
K
Rear View
Supply
Return
Top View
Operational Requirements
of the G315
❚ The boiler must be placed on a
smooth, level concrete base,
33 ½" 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.)