Residential Boilers - Oil Boilers
Series EC™ Boiler
The Series EC™ is a residential, oil-fired, cast iron boiler for steam or hot water systems. The large water content of the boiler makes it ideal for steam and large volume hot water applications. The EC boiler has an AFUE of up to 87.6% – ENERGY STAR® certified – and features high efficiency, flame retention burners in choice of Beckett, Carlin or Riello. Optional tankless coils can be added for all your domestic hot water needs. A full, non-prorated lifetime warranty is included for all water boilers and a limited 10-year warranty covers the heat exchanger of steam boilers.
Federal Tax Credits for Energy Efficiency (ends 12/31/25): Hot Water Boilers (Natural Gas, Propane, Oil) Tax Credit | ENERGY STAR
Qualified Manufacturer ID – B1U7
Product Details:
Type: Residential
Construction: Cast Iron
Fuel: #2 Oil; and certified for biodiesel fuel blends up to 20% (B20)
Input: 101 to 420 MBH
Output: 84 to 347 MBH
Venting: Natural Draft
Trim: Water or Steam
Combustion: Flame Retention Burner
| Series EC™ |
Water Content, Gallons | Min. Stack Draft Reqd. | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Model Number | Input | Output3,4 MBH | B20 Input | B20 Output MBH | Net Ratings2 | AFUE, % | Thermal Effic.4, % | Combustion Effic.,% | |||||||||
| GPH1 | MBH | Water | Steam | MBH | Water | Steam | Steam, sqft | Steam, MBH | Water, MBH | ||||||||
| Water | Steam | Water | Steam | ||||||||||||||
| EC(T)-e-03 | 0.75 | 105 | 93 | 92 | 101 | 85 | 84 | 288 | 69 | 81 | 87.6* | 86.5 | – | – | 17.40 | 14.16 | -.03 |
| EC(T)-e-03 | 1.00 | 140 | 122 | 121 | 135 | 109 | 108 | 379 | 91 | 106 | 86.5 | 85.5 | – | – | 17.40 | 14.16 | -.04 |
| EC(T)-e-04 | 1.25 | 175 | 153 | 152 | 169 | 139 | 138 | 475 | 114 | 133 | 86.5 | 85.4 | – | – | 21.72 | 17.28 | -.03 |
| EC(T)-e-04 | 1.50 | 210 | 183 | 181 | 203 | 170 | 168 | 567 | 136 | 159 | 86.3 | 85.5 | – | – | 21.72 | 17.28 | -.04 |
| EC(T)-e-05 | 1.75 | 245 | 215 | 213 | 237 | 201 | 199 | 667 | 160 | 187 | 86.8 | 85.5 | – | – | 26.04 | 20.40 | -.03 |
| EC(T)-e-05 | 2.00 | 280 | 243 | 242 | 271 | 232 | 231 | 758 | 182 | 211 | 86.2 | 85.0 | – | – | 26.04 | 20.40 | -.04 |
| EC(T)-05† | 2.40 | 336 | 279 | 279 | 325 | 267 | 267 | 874 | 210 | 243 | – | 83.0 | 85.1 | 26.04 | 20.40 | -.05 | |
| EC(T)-e-06† | 2.20 | 308 | – | 259 | 298 | – | 247 | 811 | 194 | – | – | – | 84.0 | – | – | 23.52 | -.04 |
| EC(T)-e-06† | 2.40 | 336 | – | 282 | 325 | – | 267 | 883 | 212 | – | – | – | 84.0 | – | – | 23.52 | -.04 |
| EC(T)-06† | 2.75 | 385 | 321 | 321 | 372 | 305 | 303 | 1006 | 241 | 279 | – | 83.3 | 84.4 | 30.36 | 23.52 | -.04 | |
| EC(T)-06† | 3.00 | 420 | 347 | 347 | 406 | 329 | 329 | 1087 | 261 | 302 | – | 82.5 | 83.7 | 30.36 | 23.52 | -.05 | |
NOTE: all values are for Type #2 oil unless noted as B20.
*As an ENERGY STAR® partner, PB Heat, LLC has determined that these firing rates meet the ENERGY STAR® guidelines for energy efficiency.
† All chimneys are 8″ x 8″ x 20′ except those models denoted with †, which are 8″ x 12″ x 20′.
1 Burner input based on No. 2 fuel oil with a heating value of 140,000 Btu per gallon.
2 Net water ratings based on an allowance of 1.15, net steam ratings based on an allowance of 1.333. Consult factory before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems, etc.
3 Output is Heating Capacity for models with inputs <300 MBH and Gross Output for models with inputs ≥300 MBH. Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government tests.
4 Thermal efficiency and gross output are determined in accordance with ANSI/AHRI Standard 1500.
Series EC™ Boiler Dimensions
| Boiler Model Number | Jacket Depth “A” |
Jacket Width “B” |
Jacket Height “C” |
Rear of Jacket to c/l of Vent “D” |
Distance Between Supply Tappings “E” |
Vent Size Diameter “F” |
|---|---|---|---|---|---|---|
| EC(T)-e-03 | 15-3/4″ | 22-1/2″ | 42″ | 8-3/4″ | 9-1/16″ | 6″ |
| EC(T)-e-04 | 19-15/16″ | 22-1/2″ | 42″ | 10-7/8″ | 13-1/4″ | 7″ |
| EC(T)-e-05 | 24-1/8″ | 22-1/2″ | 42″ | 13″ | 17-7/16″ | 8″ |
| EC(T)-e-06/06 | 28-5/16″ | 22-1/2″ | 42″ | 15-1/16″ | 21-5/8″ | 9″ |