NEW High Efficiency Gas Fired, Stainless Steel, Condensing Combi Boiler

VALUE-PRICED WITH PREMIUM FEATURES

• 95%AFUEwith10:1turndown–NEW!

• Reliable,provenstainlesssteel heatexchangertechnology

• Flatplateheatexchangerprovides superbdomestichotwaterperformance

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

• Touchscreendiagnosticdisplaywith plain-languageguidance

• FREE5-yearpartswarrantyincluded

• LowNOx*

EXTRA BUILT-IN FEATURES

• Universalboilerventconnectionfor polypropylene,CPVC/PVC,&flexible stainlesssteel• Outdoorresetandsensor

• Pre-installedsafetyreliefvalvepiping

ANYWHEREUNMATCHED

ANYWHEREUNMATCHED

MADE IN U.S.A.

*MeetsrequirementsofSouthCoastRule1146.2

©2017U.S.BoilerCompany,Inc.Lancaster,PAPhone:1-888-432-8887

FormNo.USBL1708220m

www.usboiler.net

K2 Combi: Technical Information ASM

E

H

K2 Combi Ratings & Specifications

Model AFUE

%

HeatingInput

(MBH)min-max

DOE HeatingCapacity(MBH)

Net AHRI

(MBH)

DHW RatesVent Size(In.)

Net Wt.

(lbs.)

at 70° TR

(GPM)

at 77° TR

(GPM)

Input(MBH)

min-maxK2WTC-135B 95.0 12-120 112 97 3.3 3.0 12-135 3 109K2WTC-180B 95.0 18-180 169 147 4.5 4.1 18-180 3 126

Standard Equipment • Directvent,10:1turndown,sealedcombustion appliance• Stainlesssteelheatexchanger• Pre-installedcirculatorandDHW3-wayvalve• DHWflatplateheatexchangerinsidejacket• Sage2.3ControlSystem –LCDtouchscreendisplay –Self-guidedcontrolmenus –Built-inselfdiagnostics –Additionalcirculatoroutputavailable –Outdoorresetincludingoutsidesensor –DHWpriority –Warmweathershutdown• Variablespeedcombustionblower• Gasvalve• Polypropylenecondensatetrap• Flowswitch,pre-installed• Supply,return,&autoresethighlimitwater sensors• Universalexhaustventconnection (CPVC/PVC,PP,SS)• Fluegastemp.sensor&differentialpressureswitch• Pre-installedhangingbracketandwallmountkit

SafetyReliefValvePressure,Water–30PSIstd.ASMEcertified“H”.MaximumAllowableWorkingPressureat30PSI,Maxallowabletemperaturesetting210ºF.Targetsetpointis180°F,manualresethighlimitsetpointis210°F.Boilersshippedsetfornaturalgas.Aboveperformanceisforelevationsto2000’.ConsultInstallation,Operating,andServiceInstructionsforinstallationsupto10,100’andforadditionalimportantnotesanddetails.

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

Horizontal2-pipelowprofile

Horizontal2-pipeconcentric

Illustrationsareforrepresentationonly.Forcompleteventinginformation,pleaseseeInstallation,Operating,andServiceInstructions.

Vertical2-pipe

Vertical2-pipeconcentric

Horizontal2-pipe

Hybrid

Verticalexhaust/sealedB-ventforcombustionair

Optional Equipment:• Naturalgas;LPconversionkitforelevationsto 2000’soldseparately: (135BP/N:107874-01,180BP/N:107875-01)• SageZoneControl (CirculatorPanelP/N:104590-01) (ValvePanelP/N104589-01)• Servicepartskit(P/N:106260-03)• Kit,CPVCstarterandPVCventterminations (2”P/N:107039-01,3”P/N:107039-02)

PLUS polypropylene & stainless steel chimney chase options

C

A

17”

Vent Connection

Relief Valve

Temperature/PressureGauge (inside cabinet)

Air IntakeConnection

Access Door

Boiler SupplyWater Connection

Boiler ReturnWater Connection

Domestic Hot Water OutletDomestic Cold Water Outlet

Gas ConnectionCondensate Trap Cleanout

30”

Outside of Wall

Inside of Wall

Model(s) “A” dimension

K2WTC-135B 15”

K2WTC-180B 19”