Commercial Boilers - Gas Boilers Series 211A™ Boiler

The Series 211A™ atmospheric, gas-fired steam boiler is designed for maximum corrosion resistance and longer life. The low profile design allows for installations in applications with low head room. The commercial cast iron boiler is installed with water and steam-tight flexible flow port seals for faster installation and allows for the sections to expand/contract independently. Easy and complete access to the boiler for inspection and cleaning can be accomplished without removal of the entire jacket, thereby promoting better maintenance.
Product Details:
Type: Commercial
Construction: Cast Iron
Fuel: Gas-Fired (Natural or LP)
Input: 630 to 7,560 MBH*
Output: 486 to 5,904 MBH*
Venting: Natural Draft
Trim: Steam
Ignition: Spark Pilot
*ranges shown for models up to 211A-37
Series 211A™* ![]() |
Thermal Efficiency, % | Combustion Efficiency, % | Boiler H.P. | Steam Water Content, Gal | ||||
---|---|---|---|---|---|---|---|---|
Model Number | Input, MBH | Gross Output, MBH1 | Net Ratings2 | |||||
Steam, sqft | Steam, MBH | |||||||
211A-04 | 630 | 486 | 1521 | 365 | 77.1 | 79.8 | 14.5 | 31.64 |
211A-05 | 840 | 650 | 2033 | 488 | 77.4 | 80.0 | 19.4 | 39.55 |
211A-06 | 1050 | 816 | 2550 | 612 | 77.7 | 80.0 | 24.4 | 47.46 |
211A-07 | 1260 | 980 | 3063 | 735 | 77.8 | 80.0 | 29.3 | 55.37 |
211A-08 | 1470 | 1145 | 3579 | 859 | 77.9 | 80.0 | 34.2 | 63.28 |
211A-09 | 1680 | 1310 | 4113 | 987 | 78.0 | 80.0 | 39.1 | 71.19 |
211A-10 | 1890 | 1476 | 4688 | 1125 | 78.1 | 80.0 | 44.1 | 79.10 |
211A-11 | 2100 | 1642 | 5263 | 1263 | 78.2 | 80.0 | 49.1 | 87.01 |
211A-12 | 2310 | 1806 | 5829 | 1399 | 78.2 | 80.0 | 54.0 | 94.92 |
211A-13 | 2520 | 1958 | 6333 | 1520 | 77.7 | 80.0 | 58.5 | 102.83 |
211A-14 | 2730 | 2124 | 6871 | 1649 | 77.8 | 80.0 | 63.5 | 110.74 |
211A-15 | 2940 | 2290 | 7408 | 1778 | 77.9 | 80.0 | 68.4 | 118.65 |
211A-16 | 3150 | 2454 | 7938 | 1905 | 77.9 | 80.0 | 73.3 | 126.56 |
211A-17 | 3360 | 2621 | 8479 | 2035 | 78.0 | 80.0 | 78.3 | 134.47 |
211A-18 | 3570 | 2785 | 9008 | 2162 | 78.0 | 80.0 | 83.2 | 142.38 |
211A-19 | 3780 | 2952 | 9550 | 2295 | 78.1 | 80.0 | 88.2 | 150.29 |
211A-20 | 3990 | 3116 | 10,079 | 2419 | 78.1 | 80.0 | 93.1 | 158.2 |
211A-21 | 4200 | 3280 | 10,613 | 2547 | 78.1 | 80.0 | 98 | 166.11 |
211A-22 | 4410 | 3449 | 11,158 | 2678 | 78.2 | 80.0 | 103.0 | 174.02 |
211A-23 | 4620 | 3599 | 11,642 | 2794 | 77.9 | 80.0 | 107.5 | 181.93 |
211A-24 | 4830 | 3763 | 12,175 | 2922 | 77.9 | 80.0 | 112.4 | 189.84 |
Chart shows up to 211A-24; for ratings up to 211A-37, please consult 211A CUT sheet.
Note: For LP Ratings decrease by 2.5%.
* Assembled blocks available to 19 sections only.
- Gross Output Rating, Thermal Efficiency and Combustion Efficiency determined in accordance with AHRI requirements.
- Net AHRI steam ratings based on an allowance shown in table.
- Consult factory before selecting a boiler for installation having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems, etc.
- Consult product catalog literature for larger capacities and detailed ratings information up to 9,450 MBH.

Series 211A™ Boiler Dimensions
Boiler Model Number | Dimensions Length & Width | Boiler Section Length | ||
---|---|---|---|---|
“A” | “B” | “C” | ||
211A-04 | 28-1/8″ | 38-3/8″ | 63″ | 21-3/4″ |
211A-05 | 33-3/4″ | 44″ | 63″ | 27-3/8″ |
211A-06 | 39-3/8″ | 50-1/4″ | 65″ | 33″ |
211A-07 | 45″ | 55-7/8″ | 63″ | 38-5/8″ |
211A-08 | 50-5/8″ | 61-3/4″ | 63″ | 44-1/4″ |
211A-09 | 56-1/4″ | 67-5/8″ | 63″ | 49-7/8″ |
211A-10 | 61-7/8″ | 73-1/4″ | 65″ | 55-1/2″ |
211A-11 | 67-1/2″ | 80-3/4″ | 65″ | 61-1/8″ |
211A-12 | 73-1/8″ | 86-3/8″ | 63″ | 66-3/4″ |
211A-13 | 78-3/4″ | 91-1/2″ | 63″ | 72-3/8″ |
211A-14 | 84-3/8″ | 97-1/8″ | 65″ | 78″ |
211A-15 | 90″ | 102-3/4″ | 65″ | 83-5/8″ |
211A-16 | 95-5/8″ | 108-3/8″ | 65″ | 89-1/4″ |
211A-17 | 101-1/4″ | 114-1/4″ | 65″ | 94-7/8″ |
211A-18 | 106-7/8″ | 120-3/8″ | 65″ | 100-1/2″ |
211A-19 | 112-1/2″ | 139-1/8″ | 65″ | 106-1/8″ |
211A-20 | 118-1/8″ | 144-3/4″ | 65″ | 111-3/4″ |
211A-21 | 123-3/4″ | 150-3/8″ | 65″ | 117-3/8″ |
211A-22 | 129-3/8″ | 156″ | 65″ | 123″ |
211A-23 | 135″ | 161-5/8″ | 65″ | 128-5/8″ |
211A-24 | 140-5/8″ | 166-3/8″ | 65″ | 134-1/4″ |
211A-25 | 146-1/4″ | 172″ | 65″ | 139-7/8″ |
211A-26 | 151-7/8″ | 177-5/8″ | 65″ | 145-1/2″ |
211A-27 | 157-1/2″ | 183-1/4″ | 65″ | 151-1/8″ |
211A-28 | 163-1/8″ | 188-7/8″ | 65″ | 156-3/4″ |
211A-29 | 168-3/4″ | 194-1/2″ | 65″ | 162-3/8″ |
211A-30 | 174-3/8″ | 200-1/8″ | 65″ | 168″ |
211A-31 | 180″ | 205-3/4″ | 65″ | 173-5/8″ |
211A-32 | 185-5/8″ | 211-7/8″ | 65″ | 179-1/4″ |
211A-33 | 191-1/4″ | 217-1/2″ | 65″ | 184-7/8″ |
211A-34 | 196-7/8″ | 223-7/8″ | 65″ | 190-1/2″ |
211A-35 | 202-1/2″ | 229-1/2″ | 65″ | 196-1/8″ |
211A-36 | 208-1/8″ | 262″ | 65″ | 201-3/4″ |
211A-37 | 213-3/4″ | 268″ | 65″ | 207-3/8″ |
Series 211A™ Boiler Dimensions (Cont’d)
Boiler Model Number | Intermediate Riser Center Lines 3″ Tappings – Used in Addition to Two End Risers (Dimensions are Approximate) |
||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
“D” | “E” | “F” | “G” | “H” | “I” | “J’ | “K” | “L” | “M” | “N” | “O” | “P” | |
211A-04 | BOILER MODEL NUMBERS 211A-04-S TO 211A-17-S INCLUSIVE DO NOT INCORPORATE INTERMEDIATE TAPPED SECTIONS |
||||||||||||
211A-05 | |||||||||||||
211A-06 | |||||||||||||
211A-07 | |||||||||||||
211A-08 | |||||||||||||
211A-09 | |||||||||||||
211A-10 | |||||||||||||
211A-11 | |||||||||||||
211A-12 | |||||||||||||
211A-13 | |||||||||||||
211A-14 | |||||||||||||
211A-15 | |||||||||||||
211A-16 | |||||||||||||
211A-17 | |||||||||||||
211A-18 | 53-1/16″ | 47-7/16″ | |||||||||||
211A-19 | 53-1/16″ | 53-1/16″ | |||||||||||
211A-20 | 58-11/16″ | 53-1/16″ | |||||||||||
211A-21 | 58-11/16″ | 58-11/16″ | |||||||||||
211A-22 | 41-13/16″ | 45″ | 36-3/16″ | ||||||||||
211A-23 | 41-13/16″ | 45″ | 41-13/16″ | ||||||||||
211A-24 | 47-7/16″ | 45″ | 41-13/16″ | ||||||||||
211A-25 | 36-3/16″ | 33-3/4″ | 33-3/4″ | 36-3/16″ | |||||||||
211A-26 | 36-3/16″ | 33-3/4″ | 39-3/8″ | 36-3/16″ | |||||||||
211A-27 | 36-3/16″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 30-9/16″ | ||||||||
211A-28 | 24-15/16″ | 33-3/4″ | 33-3/4″ | 33-3/4″ | 30-9/16″ | ||||||||
211A-29 | 24-15/16″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 24-15/16″ | |||||||
211A-30 | 30-9/16″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 24-15/16″ | |||||||
211A-31 | 30-9/16″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 30-9/16″ | ||||||
211A-32 | 30-9/16″ | 28-1/8″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 30-9/16″ | ||||||
211A-33 | 24-15/16″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 24-15/16″ | |||||
211A-34 | 24-15/16″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 28-1/8″ | 22-1/2″ | 22-1/2″ | 24-15/16″ | |||||
211A-35 | 24-15/16″ | 22-1/2″ | 22-1/2″ | 28-1/8″ | 28-1/8″ | 22-1/2″ | 22-1/2″ | 24-15/16″ | |||||
211A-36 | 24-15/16″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 19-5/16″ | ||||
211A-37 | 24-15/16″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 24-15/16″ |
Series 211A™ Boiler Dimensions (Cont’d)
Boiler Model Number | Flue Connection Center Lines | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
“AA” | “BB” | “CC” | “DD” | “EE” | “FF” | “GG” | “HH” | “II” | “FF” | |
211A-04 | 10-7/8″ | 10-7/8″ | ||||||||
211A-05 | 13-3/4″ | 13-5/8″ | ||||||||
211A-06 | 16-1/2″ | 16-1/2″ | ||||||||
211A-07 | 10-7/8″ | 16-7/8″ | 10-7/8″ | |||||||
211A-08 | 13-3/4″ | 19-5/8″ | 10-7/8″ | |||||||
211A-09 | 13-3/4″ | 22-1/2″ | 13-5/8″ | |||||||
211A-10 | 16-1/2″ | 25-3/8″ | 13-5/8″ | |||||||
211A-11 | 16-1/2″ | 28-1/8″ | 16-1/2″ | |||||||
211A-12 | 13-3/4″ | 22-1/2″ | 19-5/8″ | 10-7/8″ | ||||||
211A-13 | 13-3/4″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | ||||||
211A-14 | 16-1/2″ | 25-3/8″ | 22-1/2″ | 13-5/8″ | ||||||
211A-15 | 16-1/2″ | 25-3/8″ | 25-1/4″ | 16-1/2″ | ||||||
211A-16 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 16-1/2″ | ||||||
211A-17 | 13-3/4″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | |||||
211A-18 | 16-1/2″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | |||||
211A-19 | 13-3/4″ | 25-3/8″ | 28-1/8″ | 25-1/4″ | 13-5/8″ | |||||
211A-20 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 13-5/8″ | |||||
211A-21 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 16-1/2″ | |||||
211A-22 | 16-1/2″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | ||||
211A-23 | 16-1/2″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | ||||
211A-24 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 13-5/8″ | ||||
211A-25 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 13-5/8″ | ||||
211A-26 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 16-1/2″ | ||||
211A-27 | 16-1/2″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | |||
211A-28 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | |||
211A-29 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 13-5/8″ | |||
211A-30 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 13-5/8″ | |||
211A-31 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 16-1/2″ | |||
211A-32 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | ||
211A-33 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 13-5/8″ | ||
211A-34 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 13-5/8″ | ||
211A-35 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 22-1/2″ | 13-5/8″ | ||
211A-36 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 16-1/2″ | ||
211A-37 | 16-1/2″ | 28-1/8″ | 28-1/8″ | 28-1/8″ | 25-3/8″ | 22-1/2″ | 22-1/2″ | 22-1/2″ | 13-5/8″ |