ES2™

Gas Fired, Chimney Vented,Cast Iron Water Boiler

• ConsistsoftheIntelligentHydronicControland IQOptionPanel

Intelligent Hydronic Control• Providesfastandeasy“outofthebox”installation.

• Simplecodesconveyboilerstatusandeliminateguesswork

• Combinesaquastat,relay,andignitionfunctionsintoasinglemodule

• Twocustomizableintegratedswitchingrelaysforeasyadditionofadditionalheatingzoneorindirectwaterheater

IQ Option Panel• Enablestheeasyplug&playinstallationofoptionalfeaturessuchasoutdoorreset,LWCO,andhighlimit

Optional Touchscreen• LCDdisplaysallboilersettings,diagnostics,andtroubleshootinginsentences,notcodes

boilercontrol

optionpanel

optioncard

controlsystem

85% Efficient!

ANYWHEREUNMATCHED

ANYWHEREUNMATCHED

ANYWHEREUNMATCHED

ANYWHEREUNMATCHED

ANYWHEREUNMATCHED

• 85%AFUE

• Electronicignition

• Easy,intelligentIQControlSystem™

• Outdoorresetavailable–increasesefficiency by15-20%

• 70–280MBH(7sizes)

• Industrystandardtappinglocationsfitthousands ofexistingboilerinstallations

• Reliable,American-madecastironheat exchangeracceptsreturnwateraslowas110°F

• Lifetimelimitedwarranty

©2015U.S.BoilerCompany,Inc.-Lancaster,PAPhone:1-888-432-8887PrintedintheU.S.A.

FormNo.HYDL09081-2/1510mswww.usboiler.net

ES2 Dimensions & Connections

Model

Dimensions (inches) Connections (inches) WaterContent (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 2ES24 15-1/2 41 33 1-1/4 1-1/4 1/2 3/4 3ES25 18-1/2 41 33 1-1/4 1-1/4 1/2 3/4 4ES26 21-1/2 41 33 1-1/4 1-1/4 1/2 3/4 5ES27 24-3/4 41 33 1-1/4 1-1/4 3/4 3/4 6ES28 27-3/4 41 33 1-1/4 1-1/4 3/4 3/4 7ES29 30-3/4 41 33 1-1/4 1-1/4 3/4 3/4 8

Available for natural or LP gasRatings 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”

FLOORLINE

23”**

41”

4” “W” 1”

40”FLUE

34”ELECTRICAL

27”SUPPLY

18”GAS

15”RETURN

FLOORLINE0”

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 specified by manufacturer’s installation instructions* Minimalradialdistancearoundventpipeandbreeching** Addheightrequiredtomaintain6”clearancefromallbreechingcomponents*** Areaofeachopening1sq.inchforeach1,000BTUHinput-withminimumof100sq.inches.Heightofopeningshouldbehalfthewidth.

ES2: Technical InformationES2 Ratings & Specifications

Model AFUE%Input

(MBH)

DOE HeatingCapacity(MBH)

Net AHRI (MBH)

Vent Size(Inches)

Approx. Shipping Weight. (lbs.)

ES23 85 70 59 51 4 254ES24 85 105 89 77 5 301ES25 85 140 119 103 6 353ES26 85 175 149 130 6 405ES27 85 210 178 155 7 464ES28 85 245 208 181 7 514ES29 85 280 238 207 8 564

Standard Equipment • Insulatedsleek,modernjacket• Integrateddraftdiverter,damperandconnectorincluded• Heavygauge1”and1-1/2”baseinsulation• IntelligentHydronicControl–Simpleself-diagnostic controlsystemwith3-digitreadoutforstatussettings anderrors• IQOptionPanel,acceptsplug&playIQOptionCardsfor –OutdoorresetwithDHWpriority –Autoormanualresetlowwatercutoff –Autoormanualauxilliaryhighlimit• Step-openingredundantgasvalve• Stainlesssteelfluebaffles• 110°Fminimumreturntemperaturerating• Sparkignitionwithretry• User-friendlywiringwith120VJ-box• Circulator• Castironsectionassembly• Resettableblockedventswitch• Boilerdrainvalve• Castironsupplymanifoldwithsafetyreliefvalvetapping

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