High Efficiency Gas Fired, Stainless Steel, Condensing Water Boiler

VALUE-PRICED WITH PREMIUM FEATURES

• 95%AFUEwith10:1turndown–NEW!

• Reliable,provenstainlesssteelheatexchanger technology

• Factorypre-setSage2.3™ControlSystem, providingout-of-the-boxhighperformance

• Touchscreendiagnosticdisplaywith plain-languageguidance

• Exclusivefeaturesforinstallerconvenience andhomeownerdependability

• Highaltitude–Minimalde-ratings,reducesthe costsofoversizing,fieldadjustable

• FREE5-yearpartswarrantyincluded

• LowNOx*

EXTRA BUILT-IN FEATURES

• Highcapacitypre-installedboilerloop circulator• Split-voltagejunctionbox• Universalboilerventconnectionfor polypropylene,CPVC/PVC,& stainlesssteel• Outdoorresetandsensor

ANYWHEREUNMATCHED

ANYWHEREUNMATCHED

MADE IN U.S.A.*MeetsrequirementsofSouthCoastRule1146.2

K2 It’sthecondensingboilerthatyou’vebeenaskingfor…

SAVES TIME!• IntelligentSage2.3BoilerControlSystem

–Factorypre-setsoffer“out-of-the-box” performance

–Touchscreendisplaywithstep-by-stepsetup guidanceanddiagnostics

• Designedforeaseofinstallation&service

–Hingedcontroldoorisolateselectronics– Fastandeasyaccesstocombustion chamber

–“Coldburnerdoor”speedsservicestart

–Integral,easyaccessjunctionboxincluded withseparatehighvoltageandfused,low voltagecommunicationboards

–Easyclean-outcondensatetrap

–Sideaccesspanel

• Universalboilerventconnection (polypropylene,CPVC/PVC,andstainlesssteelflex)

SAVES MONEY!• Pre-installedpremiumboilerloopcirculator eliminatespumpselectionandexpense

Display product shown. Interior of junction box is visible for illustration purposes only.

Contractors told us exactly what they wanted.Avalue-priced,highefficiencycondensingboilerthatissimpleenoughto

installquicklyANDoffersvaluableextrasnotfoundoncompetitivemodels.U.S.BoilerCompanyhasdelivered.

TheK2offersacomprehensivefeaturelist,unequalledeaseofsetup,maintenance,andoperationinapackagethatcosts

farlessthanyou’dexpectfortheimpressivevaluethat’sbuiltin.Andbestofall,it’sbuiltandtestedwithprideinLancaster,

PennsylvaniabyU.S.BoilerCompany.

HOMEOWNER VALUE!• Stainlesssteelheatexchangerofferslong-term reliability

–Nowelds,reducingpotentialcorrosionpoints

• Highefficiency,highperformance,highcomfort

–95%AFUE

–10:1turndownlowersfueluse

–Veryquietoperation-negativepressuredesign

–“Coldburnerdoor”designrecoversheatfor addedenergysavings

• Attractive,reinforced16and22-gaugesteel construction

• Advancedsystemtestingcarefullyverifiesthe performanceeveryK2boilerbeforeitleavesour factory

–Worry-freeinstallation;boilerdisplayverifies reliableoperation

• FREE5-yearpartswarrantyincluded

Pre-installedhighcapacitypumpoptimizeswaterflowtoensureproperboileroperation.Sidepanelaccess.

Touchscreendisplayoffersstep-by-stepassistanceinsetupandtroubleshooting.

Display product shown. Interior of junction box is visible for illustration purposes only.

FastPipe™,optionalready-madeprimary/secondarypipingsolutionsavesinstallationtimeandcost.

K2CombiModels(availablelate2017)featureanintegratedflatplateheatexchangerfordomestichotwater.Availableinthreesizes–120,150,and180MBH.(Completeproductinfoavailableseparately).

©2018U.S.BoilerCompany,Inc.Lancaster,PAPhone:1-888-432-8887FormNo.USBL1406120m9/17

www.usboiler.net

K2: Technical Information ASM

E

H

K2 Ratings & Specifications

Model AFUE%

Input(MBH)

min-max

DOE HeatingCapacity(MBH)

Net AHRI

(MBH)

Vent Size

(Inches)

Approx. Net

Weight (lbs.)

K2WT-080B 95.0 8-80 74 64 2or3 100K2WT-100B 95.0 10-100 94 82 2or3 102K2WT-120B 95.0 12-120 112 97 3 105K2WT-150B 95.0 15-150 142 123 3 119

K2WT-180B 95.0 18-180 169 147 3 119K2WT-180M 94.5 18-180 168 146 3 119

Standard Equipment • Directvent,10:1turndown,sealedcombustionappliance

• Stainlesssteelheatexchanger

• Pre-installedboilerloopcirculator

• Easyaccesscontrolpanelonhingeddoor

• Separatedhighandlowvoltagejunctionbox

• Sage2.3ControlSystem –LCDtouchscreendisplay –Self-guidedcontrolmenus –Built-inselfdiagnostics –(2)additionalcirculatoroutputsavailable –Built-insequencer,stagesupto(8)boilers –Outdoorresetincludingoutsidesensor –DHWpriority –Warmweathershutdown

• Variablespeedcombustionblower

• Gasvalve

• Polypropylenecondensatetrap

• Flowswitch,pre-installed

• Supply,return,andautoresethighlimitwatersensors

• Universalexhaustventconnection(CPVC/PVC,PP,SS)

• Fluegastemperaturesensoranddifferentialpressureswitch

• Pre-installedhangingbracketandwallmountkit

• Fieldadjustableforhighaltitude

K2 Dimensions (Inches)Model A* B C

K2WT-080B 16-3/16 3 7-3/8

K2WT-100B 16-3/16 3 7-7/16

K2WT-120B 16-3/16 3 7-7/16

K2WT-150B 20-3/16 4-7/16 8

K2WT-180B/M 20-3/16 4-7/16 8

17”

29”

Air Intake

Vent

Access Panel

3-9/16”4-3/4”

5-1/16”

A A

1” NPT Supply

C

B

1” NPT Return

7-3/16”4-1/8”

10-5/16” 1-15/16”

1-13/16”

1/2” Gas Line

Condensate Trap Outlet

Left Front Right

Top

Bottom

6”

*Opencontroldoorextendsdimensionadditional15”

SafetyReliefValvePressure,Water–30PSIstd.ASMEcertified“H”.MaximumAllowableWorkingPressureat50PSI,Maxallowabletemperaturesetting210ºF.Targetsetpointis180°F,manualresethighlimitsetpointis210°F.Boilersshippedsetfornaturalgas.Aboveperformanceisforelevationsto2000’.ConsultInstallation,Operating,andServiceInstructionsforinstallationsupto10,100’.180Mmodelisonlyforinstallationsosver2,000’

Typical Venting Configurations (Horizontal and Vertical–up to 135 eq.ft.each)

Horizontal2-pipelowprofile

Horizontal2-pipeconcentric

Illustrationsareforrepresentationonly.Forcompleteventinginformation,pleaseseeInstallation,Operating,andServiceInstructions.

Vertical2-pipe

Vertical2-pipeconcentric

Horizontal2-pipe

Hybrid

Verticalexhaust/sealedB-ventforcombustionair

PLUS polypropylene & stainless steel chimney chase options

C

Optional Equipment:• Naturalgas;LPconversionkitforelevations to2000’soldseparately: 080B-100BP/N:107873-01 120B-150BP/N:107874-01 180BP/N:107875-01 180MP/N:108101-01• FastPipeprimary/secondaryadapterPN: 80-120MBH–(106259-01) 150,180MBH–(106259-02)• SageZoneControl (CirculatorPanelP/N:104590-01) (ValvePanelP/N104589-01)• LWCOkit(P/N:105591-01)• Servicepartskit(P/N:106260-03)• Floorstandkit(P/N:108017-01)• Kit,CPVCstarterandPVCventterminations (2”P/N:107039-01,3”P/N:107039-02)