{"product_id":"viessmann-cu3a-160-vitocrossal-300-cu3a-160-000-btu-gas-condensing-boiler","title":"Viessmann CU3A-160 Vitocrossal 300 CU3A 160,000 BTU Gas Condensing Boiler","description":"\u003ch2\u003eRight-Size Your Heat With Viessmann CU3A-160 Vitocrossal 300 160 MBH Floor-Standing Condensing Boiler\u003c\/h2\u003e \u003cp\u003e Need steady, high-temperature comfort without the fuel waste? The \u003cstrong\u003eVitocrossal 300 CU3A-160\u003c\/strong\u003e is a floor-standing \u003cstrong\u003egas-fired condensing boiler\u003c\/strong\u003e that combines a high-mass stainless \u003cstrong\u003eInox-Crossal\u003c\/strong\u003e heat exchanger with a modulating MatriX dome burner for quiet, even heat and 95% AFUE—ideal for cast-iron radiator retrofits and multi-zone fin-tube systems. \u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Viessmann\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMPN:\u003c\/strong\u003e CU3A-160\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Floor-Standing Gas-Fired Condensing (Heat-Only) Hydronic Boiler\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSize\/Capacity:\u003c\/strong\u003e 43–160 MBH input; Net AHRI 129 MBH; 95% AFUE\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaterial\/Finish:\u003c\/strong\u003e Stainless-steel Inox-Crossal heat exchanger; MatriX modulating dome burner\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePerformance:\u003c\/strong\u003e Sound 53 dB (max) \/ 33 dB (min); condensate up to ~1.6 USG\/h; boiler water content 18.8 USG; altitude operation to 10,000 ft (de-rate applies)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConnections\/Fit:\u003c\/strong\u003e Heating supply\/return 1¼\" NPTM; PRV ¾\" NPTF; boiler drain 1\" NPTM; gas ¾\" NPTF; direct-vent; 4\" flue \/ 3\" combustion air; allowable vent lengths up to ~198 ft (layout-dependent)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 61.5\"–67\" H × 26\" W × 31.5\" D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Vitotronic 200 outdoor-reset control with outdoor sensor; installation fittings with 30 psig PRV; T\u0026amp;P gauge (field-installed on supply); pre-wired and internally piped; NG factory-set with LP conversion labels in literature set\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e ENERGY STAR (95% AFUE); ANSI Z21.13\/CSA 4.9; ASME Section IV \/ CSA B51; zero-clearance to combustibles when installed per instructions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited lifetime heat-exchanger warranty (residential); parts coverage up to 5 years with registration—see Viessmann warranty\u003c\/li\u003e \u003c\/ul\u003e \u003ch4\u003eSave Fuel With High Efficiency\u003c\/h4\u003e \u003cp\u003eAt 95% AFUE—and up to 98% efficiency at low return temps—the CU3A-160 squeezes more heat out of every therm, reducing monthly fuel spend while keeping comfort high.\u003c\/p\u003e \u003ch4\u003eEveryday Performance You Can Feel\u003c\/h4\u003e \u003cp\u003eA 43–160 MBH input range and high-mass water volume minimize short-cycling, delivering smooth, quiet heat across changing loads—great for older radiators and mixed high-temp zones.\u003c\/p\u003e \u003ch4\u003eBuilt To Last\u003c\/h4\u003e \u003cp\u003eThe Inox-Crossal stainless heat exchanger and MatriX burner are engineered for clean combustion and self-shedding condensate, helping maintain efficiency and resist corrosion over years of service.\u003c\/p\u003e \u003ch4\u003eInstaller-Friendly Flexibility\u003c\/h4\u003e \u003cp\u003eChoose coaxial or two-pipe direct venting with long allowable runs (up to ~198 ft, layout-dependent). Standard 1¼\" supply\/return and ¾\" gas connections simplify piping and commissioning.\u003c\/p\u003e \u003ch4\u003eSmart Controls \u0026amp; Compatibility\u003c\/h4\u003e \u003cp\u003eOn-board Vitotronic outdoor-reset control supports multi-circuit designs and easy setup, so systems start quickly and run efficiently in day-to-day operation.\u003c\/p\u003e \u003ch4\u003eFits Your Space\u003c\/h4\u003e \u003cp\u003eCompact footprint and a listing for zero-clearance to combustibles enable closet or alcove installs while keeping full front\/rear service access.\u003c\/p\u003e","brand":"Viessmann","offers":[{"title":"Default Title","offer_id":43932325838899,"sku":"VIESCU3A160","price":7183.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0662\/5964\/8563\/files\/Vitocrossal-300-CU3A_Front_1280x1280_transparent.png?v=1769701621","url":"https:\/\/plumbing-deals.com\/products\/viessmann-cu3a-160-vitocrossal-300-cu3a-160-000-btu-gas-condensing-boiler","provider":"Plumbing Deals","version":"1.0","type":"link"}