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ES2 Series
Boiler Model
Input (MBH) DOE Heating Capacity (MBH) Net I=B=R Rating (MBH) AFUE (%)
ES23 70 59 51 85
ES24 105 88 77 85
ES25 140 118 102 85
ES26 175 147 128 85
ES27 210 176 153 85
ES28 245 206 179 85
ES29 280 235 205 85
Ratings
SPECIFICATIONS
Boiler
Model
Depth Width Height
Supply NPT
(inch)
Return NPT
(inch)
Vent
(inch)
Gas NPT
(inch)
Relief Valve
NPT (inch)
Drain
NPT (inch)
ES23 33 12¾ 41 1¼ 1¼ 4 ½ ¾ ¾
ES24 33 15½ 41 1¼ 1¼ 5 ½ ¾ ¾
ES25 33 18½ 41 1¼ 1¼ 6 ½ ¾ ¾
ES26 33 21½ 41 1¼ 1¼ 6 ½ ¾ ¾
ES27 33 24¾ 41 1¼ 1¼ 7 ¾ ¾ ¾
ES28 33 27¾ 41 1¼ 1¼ 7 ¾ ¾ ¾
ES29 33 30¾ 41 1¼ 1¼ 8 ¾ ¾ ¾
Dimensions and Connections
Electrical Requirements: 120VAC, 60 Hz, 1-ph, 15A
Boiler Model
Allowable Supply
Water Temperature
(°F)
Minimum Return
Water Temperature
(°F)
Minimum Flow
(GPM)
Waterside Pressure Drop
at 20°F DT
(Ft. of Head)
ES23 130-220 110 None <1
ES24 130-220 110 None <1
ES25 130-220 110 None <1
ES26 130-220 110 None <1
ES27 130-220 110 None <1
ES28 130-220 110 None <1
ES29 130-220 110 None <1
Water Temperatures and Flows
Boiler
Model
Shipping Weight
(lbs)
Empty Weight
(lbs)
Water Content
(gal)
ES23 250 170 2
ES24 300 220 3
ES25 350 270 4
ES26 410 320 5
ES27 460 370 5
ES28 510 420 6
ES29 560 470 7
Weights and Volume