Buderus GB312/200 Submittal Sheet

GB312/200 Gas Condensing Boiler

GB312/200 Performance Data

Gas Input (MBH)
Gross IBR Output (MBH)
Input at Minimum Capacity (MBH)
Output at Minimum Capacity (MBH)
Net IBR Rating (MBH)
Thermal Efficiency
Combustion Efficiency
Boiler Horse Power

GB312/200 Operational Data

Number of Heat Exchanger Sections
Dry Weight (lbs.)
Approx. Water Content (gal.)
Min Inlet Gas Pressure NG ("WC)
Max Inlet Gas Pressure NG ("WC)
Max High Limit Temperature (°F)
Fireside Pressure Drop (Inch WC)
Flow Rate at 18°F ∆T (GPM)
Flow Rate at 36°F ∆T (GPM)
Max Working Pressure (psi)
Relief Valve Rating (MBH)
Relief Valve Pressure Rating (psi)
Max Flow Temp Heating/DHW (°F)
Max equivalent exhaust vent length (ft)
Max equivalent combustion air vent length (ft)
Venting Category
Approved Venting Materials
The following system is approved for use in U.S.A and may be
¹
used with this boiler:
Spears - CVPC pipe to Schedule 80 ASTM D1784
The following system is approved for use in Canada and may
²
be used with this boiler:
IPEX - System 636 CPVC (available in 4" only)

GB312/200 Electrical Specifications

732.6 Electrical Voltage Mains
676 Electrical Voltage Controls
220 Power Consumption Max Load (A)
217 Power Consumption Min Load (A)
588 Max Permissible Fuse Rating (A)
92.3%
92.5%

GB312/200 Clearances

20.2
Front
Rear
6
Side
585
Flue pipe to wall
6.3
3.5
10.5

Additional Information

200°F
• Outdoor reset AM10 standard with outdoor sensor
0.97
• DHW priority MC10/BC10 standard (DHW sensor not
75
included)
37
• Modulating premix burner
50 • Direct-vent sealed combustion
• Direct ignition by hot surface igniter
1,418
• Adjustable leveling legs
50
• 50 psi relief valve
172/180
100

Options

100
IV
• CSD-1 kit (high gas pressure switch / low gas pressure
CPVC¹ ²,
switch)
AL29-4C
• Condensate neutralization tank (NE–0.1)
• Logamatic 4323 Control
- Sequencing up to 8 boilers
- System and zoning control for pumps and valves
- solar integration
- plate and frame heat exchanger control
• CM10 two boiler module
• EM10 BMS integration 0-10V input stand alone control
• Low water cutoff
• High temperature manual reset
• DHW sensor
Note: Refer to applications manual for specific information on venting,
piping, electrical connections and pump sizing.
Engineering
Submittal
Sheet
120V/60Hz
24V
1.91
0.41
10
Minimum Clearance Wall Clearance
to Combustibles Recommended (Inch)
(Inch)
20
22
20
6
28
28
28
14