ES2 Data Sheet

©2018U.S.BoilerCompany,Inc.-Lancaster,PA
Phone:1-888-432-8887
PrintedintheU.S.A.
FormNo.HYDL09081-2/1510ms
www.usboiler.net
ES2 Dimensions & Connections
Model
Dimensions (inches) Connections (inches)
Water
Content
(gal.)Width Height Depth Supply Return
Gas
Valve
Relief
Valve
ES23 12-3/4 41 33 1-1/4 1-1/4 1/2 3/4 2
ES24 15-1/2 41 33 1-1/4 1-1/4 1/2 3/4 3
ES25 18-1/2 41 33 1-1/4 1-1/4 1/2 3/4 4
ES26 21-1/2 41 33 1-1/4 1-1/4 1/2 3/4 5
ES27 24-3/4 41 33 1-1/4 1-1/4 3/4 3/4 6
ES28 27-3/4 41 33 1-1/4 1-1/4 3/4 3/4 7
ES29 30-3/4 41 33 1-1/4 1-1/4 3/4 3/4 8
Available for natural or LP gas
Ratings shown are based on certification to 2,000 ft. For elevations above 2,000 ft, use industry standard derating (4% per 1,000 ft.)
All ES2s are shipped with 30 psi relief valves, MAWP is 50 psi.
Net AHRI Water Ratings shown based on a piping and pickup allowance of 1.15. Consult manufacturer before selecting boiler for
installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems, etc.
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.
ES2: Technical Information
ES2 Ratings & Specications
Model AFUE%
Input
(MBH)
DOE
Heating
Capacity
(MBH)
Net AHRI
Water
Rating
(MBH)
Vent Size
(Inches)
Approx.
Shipping
Weight.
(lbs.)
ES23 85.0 70 59 51 4 254
ES24 85.0 105 89 77 5 301
ES25 85.0 140 119 103 6 353
ES26 85.0 175 149 130 6 405
ES27 85.0 210 178 155 7 464
ES28 85.0 245 208 181 7 514
ES29 85.0 280 238 207 8 564
Standard Equipment
• Insulatedsleek,modernjacket
• Integrateddraftdiverter,damperandconnectorincluded
• Heavygauge1”and1-1/2”baseinsulation
• IntelligentHydronicControl–Simpleself-diagnostic 
 controlsystemwith3-digitreadoutforstatussettings
 anderrors
• IQOptionPanel,acceptsplug&playIQOptionCardsfor
 –OutdoorresetwithDHWpriority
 –Autoormanualresetlowwatercutoff
 –Autoauxilliaryhighlimit
• Step-openingredundantgasvalve
• Stainlesssteelfluebaffles
• Sparkignitionwithretry
• User-friendlywiringwith120VJ-box
• Circulator
• Castironsectionassembly
• Resettableblockedventswitch
• Boilerdrainvalve
• Castironsupplymanifoldwithsafetyreliefvalvetapping
A
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