Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The Viessmann Vitocrossal 300 CU3A-94 and Viessmann Vitocrossal 300 CU3A-160 are both condensing boilers in the Viessmann Vitocrossal 300 (CU3A) line. The Viessmann Vitocrossal 300 CU3A-94 is documented at 19–94 MBH input and 95% AFUE, while the Viessmann Vitocrossal 300 CU3A-160 is documented at 43–160 MBH input and 95% AFUE. Viessmann Vitocrossal 300 CU3A-160 lists 66 MBH more input than Viessmann Vitocrossal 300 CU3A-94 (160 MBH against 94 MBH). Both list the same published AFUE of 95%. Viessmann Vitocrossal 300 CU3A-160 lists 83 lb more shipping weight than Viessmann Vitocrossal 300 CU3A-94 (352 lb against 269 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitocrossal 300 CU3A-94 | Viessmann Vitocrossal 300 CU3A-160 |
|---|---|---|
| Input, minimum | 19 MBH | 43 MBH |
| Input, maximum | 94 MBH | 160 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown ratio | 5:1 | 5:1 |
| Weight | 269 lb | 352 lb |
| Height | 61.5 in | 61.5 in |
| Width | 26 in | 26 in |
| Depth | 27 in | 31.5 in |
| Maximum vent run | 198 ft | 198 ft |
| Fuel type | Natural gas (NG) or liquid propane gas (LPG) | Natural gas (NG) or liquid propane gas (LPG) |
| Maximum altitude | 10,000 ft | 10,000 ft |
Published ratings: the Viessmann Vitocrossal 300 CU3A-94 is rated 19–94 MBH input and 95% AFUE; the Viessmann Vitocrossal 300 CU3A-160 is rated 43–160 MBH input and 95% AFUE. Viessmann Vitocrossal 300 CU3A-160 lists 66 MBH more input than Viessmann Vitocrossal 300 CU3A-94 (160 MBH against 94 MBH). Both list the same published AFUE of 95%.
Viessmann Vitocrossal 300 CU3A-160 lists 83 lb more shipping weight than Viessmann Vitocrossal 300 CU3A-94 (352 lb against 269 lb). The depth differs: the Viessmann Vitocrossal 300 CU3A-94 lists 27 in, while the Viessmann Vitocrossal 300 CU3A-160 lists 31.5 in.
Both records print the same AFUE (95%), turndown (5:1), height (61.5 in) and width (26 in), per the cited sources.
Viessmann
The Vitocrossal 300 CU3A-94 is the smallest of Viessmann Canada's floor-standing CU3A models: 19,000 to 94,000 BTU (5.6 to 27.5 kW) of input at 95% AFUE, weighing 269 lb (122 kg), with an Inox-Crossal stainless steel heat exchanger.
Viessmann
The Vitocrossal 300 CU3A-160 is the second-largest CU3A model: 43,000 to 160,000 BTU (12.6 to 47 kW) of input at 95% AFUE, weighing 352 lb (160 kg) in the deeper floor-standing cabinet.
The Viessmann Vitocrossal 300 CU3A-160 lists 160 MBH, against 94 MBH on the Viessmann Vitocrossal 300 CU3A-94, per the cited documentation.
Both list the same AFUE of 95%.
It ships at 352 lb against 269 lb for the Viessmann Vitocrossal 300 CU3A-94, per the cited sources.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.