Commercial Boilers - Gas Boilers Series 64™ Boiler

The gas-fired, cast iron Series 64™ boiler is an atmospheric, steam or hot water boiler with up to 83% combustion efficiency. The commercial boiler features an integral draft diverter for applications with space constraints and large boiler sections with high water content for superior performance. The boiler is available as fully-packaged or as a split-block, knocked-down boiler.

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Product Details:

Type: Semi-Commercial
Construction: Cast Iron
Fuel: Gas-Fired (Natural or LP)
Input: 345 to 632.5 MBH
Output: 279 to 512 MBH
Venting: Natural Draft
Trim: Water or Steam
Ignition: Spark Ignition


Series 64™ Water Content Approx. Shipping Weight, lb
Model Number Input, MBH Gross Output3, MBH Net Ratings1 Thermal Efficiency Combustion Efficiency3
Water Steam Steam, sqft Steam, MBH Water, MBH Water, % Steam, % Water, % Steam, % Water, gal Steam, gal
64-07 345 279 274 858 206 243 81.0 79.4 83.0 82.5 22.8 15.5 945
64-08 399 323 318 996 239 281 81.0 79.6 83.0 82.5 25.2 17.0 1081
64-09 460 373 367 1146 275 324 81.0 79.7 83.0 82.5 27.6 18.6 1218
64-10 517.5* 419 413 1292 310 364 81.0 79.8 83.0 82.5 30.0 20.1 1354
64-11 575 466 459 1433 344 405 81.0 79.8 83.0 82.5 32.4 21.7 1490
64-12 632.5* 512 506 1583 380 445 81.0 79.9 83.0 82.4 34.8 23.2 1527
  1. Net Ratings are based on Gross Output less an allowance for normal piping and pickup as determined by the Testing and Rating Standard for Low Pressure Cast Iron Heating Boilers of the Hydronics Institute. Water ratings are based on a piping and pickup factor of 1.15. Steam ratings are based on a piping and pickup factor of 1.33. Consult PB Heat before selecting a boiler for gravity hot water installations or for installations having unusual piping and pickup requirements such as exposed piping, night set-back, etc. Ratings shown are for elevations up to 2,000 feet. For elevations above 2,000 feet, ratings should be reduced at the rate of 4% for each 1,000 feet above sea level.
  2. Minimum Natural Gas Inlet Pressure exceptions: 64-08 STDG 5.3”; 64-12 STDG 5.1”.
  3. Combustion efficiency and gross output are determined in accordance with ANSI Z21.13 / CSA 4.9, Gas-Fired Low-Pressure Steam and Hot Water Boilers.

*AHRI Directory indicates inputs to nearest whole number.




Series 64™ Boiler Dimensions

Boiler Model Number Jacket Depth
“A”
Jacket Width
“B”
Jacket Height
“C”
Rear of Jkt. to c/l of Vent
“D”
Left of Jkt. to c/l of Vent
“E”
Vent Size Dia.
“F”
Overall Depth
“G”
Rear of Jkt. to c/l of Supply
“H”
Rear of Jkt. to c/l of Gas Inlet
“J”
64-07 28-1/8″ 33-1/8″ 36-3/8″ 6-1/8″ 16-9/16″ 9″ 39-1/4″ 18-11/16″ 25-7/8″
64-08 30-1/8″ 37-3/8″ 36-3/8″ 7-1/2″ 18-11/16″ 10″ 43-1/8″ 18-15/16″ 26-1/8″
64-09 30-1/8″ 41-5/8″ 36-3/8″ 7-1/2″ 20-13/16″ 10″ 43-1/8″ 18-15/16″ 26-1/8″
64-10 30-1/8″ 45-7/8″ 36-3/8″ 8-1/2″ 22-15/16″ 12″ 45-1/8″ 18-15/16″ 26-1/8″
64-11 30-1/8″ 50-1/8″ 36-3/8″ 8-1/2″ 25-1/16″ 12″ 45-1/8″ 18-15/16″ 26-1/8″
64-12 30-1/8″ 54-3/8″ 36-3/8″ 8-1/2″ 27-3/16″ 12″ 45-1/8″ 18-15/16″ 26-1/8″

Tapping Locations

Tap ID Size N.P.T. Steam Water
K 1 14″ Skim Tapping* Skim Tapping*
L 1″ Tank Supply/Limit N/A
M 1″ Tank Return N/A
N 3/4″ Boiler Drain Boiler Drain
P 3″ Supply Supply
R 2 12″ Return Return
S 3/4″ Safety Valve* Relief Valve*
T 1/2″ Gauge Glass N/A
U 3/4″ Primary Probe Low Water Cut-Off N/A
V 3/4″ N/A or Primary Limit (9-12) N/A or Secondary Limit (9-12)
W 3/4″ Press. Gauge or Secondary Limit (9-12) Press./Temp. Gauge or
Primary Limit (9-12)
X 3/4″ Primary Limit or Press. Gauge (9-12) Primary Limit or Temp/Press Gauge (9-12)
Y 3/4″ Secondary Probe Low Water Cut-Off N/A

*For relief valve larger than 3/4″, use “K” boiler skim tapping. Do not increase the pipe size between the boiler and the valve.