Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The CU3A-160 and CU3A-199 are the two largest floor-standing Vitocrossal 300 models and are physically identical: both weigh 352 lb (160 kg) in the same cabinet, both fire from a 43,000 BTU (12.6 kW) minimum, and both are rated 95% AFUE. The 199 simply fires higher — 199,000 BTU (58 kW) against 160,000 BTU (47 kW) — giving it the widest published firing range in the CU3A line.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitocrossal 300 CU3A-160 | Viessmann Vitocrossal 300 CU3A-199 |
|---|---|---|
| Input, minimum | 43 MBH | 43 MBH |
| Input, maximum | 160 MBH | 199 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Weight | 352 lb | 352 lb |
| Width | 26 in | 26 in |
| Depth | 31.5 in | 31.5 in |
| Height | 61.5 in | 61.5 in |
The 160 and 199 share everything except the top of the firing range: both weigh 352 lb (160 kg) in the 26 x 31.5-inch footprint (660 x 801 mm) standing 61.5 inches (1562 mm) with the control closed, both fire down to 43,000 BTU (12.6 kW), and both are rated 95% AFUE as floor-standing condensing boilers with the Inox-Crossal heat exchanger and MatriX dome gas burner.
Maximum input is the differentiator: 160,000 BTU (47 kW) for the 160 against 199,000 BTU (58 kW) for the 199. Because the minimum fire is the same 43,000 BTU on both, the 199's wider range costs nothing in low-fire behaviour — it is pure headroom toward the line's 19 to 199 MBH ceiling.
Both models operate up to 194°F (90°C) and 10,000 ft (3,000 m) of altitude, neither is a combi, and the series supports multi-boiler installations up to 1592 MBH. The decision is the calculated peak: a plant whose load approaches 199 MBH needs the 199; below that the 160 behaves identically at lower cost.
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.
Viessmann
The Vitocrossal 300 CU3A-199 is the largest model of Viessmann Canada's floor-standing CU3A line: 43,000 to 199,000 BTU (12.6 to 58 kW) of input at 95% AFUE, weighing 352 lb (160 kg), with a 5:1 turndown MatriX dome gas burner.
No. Both weigh 352 lb (160 kg) and share the same 26 x 31.5 inch (660 x 801 mm) footprint and 61.5-inch height; only the maximum input differs.
Yes — Viessmann Canada prints a 43,000 BTU (12.6 kW) minimum input for both, so the 199's wider range is headroom at the top end only.
When the heat-loss calculation and hot-water recovery demand more than the 160 can deliver on a design day. Otherwise the 160 behaves identically at low fire.
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 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.