Specifications

Ratings
Specications
Model
Number*
Input
(MBH)
DOE
Heating Capacity
(MBH)
I=B=R Water
Ratings
(MBH) AFUE%
Electrical
Requirements
ES23 70 59 51 85.0 <2 Amps
ES24 105 88 77 85.0 <2 Amps
ES25 140 118 102 85.0 <2 Amps
ES26 175 147 128 85.0 <2 Amps
ES27 210 176 153 85.0 <2 Amps
ES28 245 206 179 85.0 <2 Amps
ES29 280 235 205 85.0 <2 Amps
Model
Number
Dimensions (inches) Connections (inches)
Water
Content
(gal.)
Approx.
Shipping Wt.
(lbs.)Width Height Depth Vent Supply Return
Gas
Valve
Relief
Valve
ES23 12-3/4” 41” 33” 4” 1-1/4” 1-1/4” 1/2” 3/4” 2 250
ES24 15-1/2” 41” 33” 5” 1-1/4” 1-1/4” 1/2” 3/4” 3 300
ES25 18-1/2” 41” 33” 6” 1-1/4” 1-1/4” 1/2” 3/4” 4 350
ES26 21-1/2” 41” 33” 6” 1-1/4” 1-1/4” 1/2” 3/4” 5 410
ES27 24-3/4” 41” 33” 7” 1-1/4” 1-1/4” 3/4” 3/4” 6 460
ES28 24-3/4” 41” 33” 7” 1-1/4” 1-1/4” 3/4” 3/4” 7 510
ES29 30-3/4” 41” 33” 8” 1-1/4” 1-1/4” 3/4” 3/4” 8 560
* Add sufx “N” for natural gas, or sufx “L” for LP gas models
**Requirement for controls only, add for amp draw of circulators.
All models certied for use from sea level to 10,000 feet in elevation. Outputs are reduced by 2% per 1,000 feet in elevations from 5,000 to 10,000 feet.
All ES2s are shipped with 30 psi relief valves, MAWP is 50 psi.
**
64”
FLOOR
LINE
23”**
41”
4”
“W” 1”
40”
FLUE
34”
ELECTRICAL
27”
SUPPLY
18”
GAS
15”
RETURN
FLOOR
LINE
0”
0”
13”
24”29”
31”
4”
43”
6”
VENTILATION AIR
INLET OPENINGS***
12”
MAX
12”
MAX
6” MIN*
NOTES:
Caution: chimney, liner, and vent connector must meet requirements
specied by manufacturer’s installation instructions
* Minimal radial distance around vent pipe and breeching
** Add height required to maintain 6” clearance from all breeching components
*** Area of each opening 1 sq. inch for each 1,000 BTUH input - with minimum
of 100 sq. Inches. Height of opening should be half the width.
HYDL09081-20ms
© 2011 U.S. Boiler Company, Inc. - Lancaster, PA
Phone:1-888-432-8887•www.usboiler.net