Viessmann CU3A-199 Vitocrossal 300 CU3A 199,000 BTU Gas Condensing Boiler
- SKU #: VIESCU3A199
- MPN #: CU3A-199
MSRP:
$10,629.00
$9,257.95
In Stock
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Power Large Loads With Viessmann CU3A-199 Vitocrossal 300 199 MBH Gas Condensing Boiler
Heating a big home or light-commercial space with steady, quiet comfort? The Vitocrossal 300 CU3A-199 is a floor-standing hydronic condensing boiler that pairs a high-mass stainless heat exchanger with a modulating MatriX dome burner for 95% AFUE efficiency, flexible venting up to long runs, and dependable day-to-day performance.
- Brand: Viessmann
- MPN: CU3A-199
- Type: Floor-Standing Gas-Fired Condensing (Heat-Only) Hydronic Boiler
- Size/Capacity: 43–199 MBH input; Net AHRI 161 MBH; 95% AFUE
- Material/Finish: Stainless-steel Inox-Crossal heat exchanger; MatriX modulating dome burner
- Performance: Sound 58 dB (max) / 33 dB (min); condensate up to 2.1 USG/h; boiler water content 18.8 USG
- Connections/Fit: Heating supply/return 1¼" NPTM; PRV ¾" NPTF; boiler drain 1" NPTM; gas ¾" NPTF; direct-vent; 4" flue / 3" combustion air; venting options support long equivalent lengths (layout-dependent); altitude operation to 10,000 ft (18% de-rate)
- Dimensions: 61.5" H (67" with control open) × 26" W × 31.5" D
- Included: Vitotronic outdoor-reset control with outdoor sensor; installation fittings with 30 psig PRV; temperature & pressure gauge (field-installed on supply); pre-wired and internally piped; NG factory-set with field LP conversion
- Certifications: ENERGY STAR; ANSI Z21.13/CSA 4.9; heat exchanger constructed to ASME Section IV & CSA B51
- Warranty: Limited lifetime heat-exchanger warranty (residential); parts up to 5 years with registration—see Viessmann warranty
Save Fuel With High Efficiency
At 95% AFUE—and up to 98% under low return temperatures—the CU3A-199 turns more of every therm into usable heat, helping trim monthly energy costs.
Everyday Performance You Can Feel
A broad 43–199 MBH modulation range and high-mass 18.8-gallon water volume reduce short-cycling for smoother, quieter heat across changing loads.
Built To Last
The Inox-Crossal stainless heat exchanger and MatriX burner are engineered for clean combustion and long service life, with robust ASME/CSA construction.
Installer-Friendly Flexibility
Coaxial or two-pipe direct venting with long allowable runs simplifies layouts. Standard 1¼" supply/return and ¾" gas connections streamline piping and commissioning.
Smart Controls & Compatibility
On-board Vitotronic control with outdoor reset and start-up wizard speeds setup and supports multi-circuit designs for efficient everyday operation.
Fits Your Space
A compact footprint and zero-clearance listing to combustibles enable closet or alcove installs while keeping full front/rear service access.