Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Viessmann · Series
The Vitocrossal 200 CM2 is Viessmann Canada's floor-standing commercial condensing boiler line with the Vitotronic 300 GW6B control: six models from CM2-186 to CM2-620, rated input 131 to 2245 MBH as a single boiler, with 95% to 95.1% printed combustion efficiency and a 5:1 turndown ratio.
Series facts
95% on the CM2-186/246/311 and 95.1% on the CM2-400/500/620, as printed in the page's efficiency rows.
The Vitocrossal 200 CM2 is a gas-fired floor-standing condensing boiler with a stainless steel Inox-Crossal heat exchanger and a fully modulating pre-mix cylinder burner. Viessmann Canada markets it for commercial plants (and large residential retrofits): rated input runs from 131 to 2245 MBH as a single boiler, with a page headline of 17,960 MBH as a cascade, and common venting of up to four boilers.
The six Canadian models split into two size ranges — CM2-186, CM2-246 and CM2-311, then CM2-400, CM2-500 and CM2-620. Each range has its own service instructions: doc 5584 109 - 16 (05/2021) covers the 186–311 models and doc 5546 489 - 15 (05/2021) covers the 400–620 models. The series runs on the Vitotronic 300 GW6B control with a 5-inch colour touchscreen, stand-alone or as primary/secondary cascade control of up to eight boilers, so no separate cascade control is required.
Printed efficiency rows are 95% combustion efficiency on the CM2-186/246/311 and 95.1% on the CM2-400/500/620, with a 5:1 turndown ratio per the page. Venting can be direct or through a chimney in PP or stainless steel, the page claims runs 'up to 200 ft', high altitude is handled to 10,000 ft with electronic adjustment, no dedicated boiler pump is required, and the series carries a limited 10-year commercial warranty.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Viessmann
The Vitocrossal 200 CM2-186 is the smallest model of the CM2 (GW6B) line: 131 to 663 MBH natural-gas input (38.5 to 194 kW) at 95% combustion efficiency, 5:1 turndown, in a 726 lb (329 kg) floor-standing unit.
Viessmann
The Vitocrossal 200 CM2-246 is the mid-size model of the small CM2 (GW6B) chassis: 175 to 878 MBH natural-gas input (51 to 257 kW) at 95% combustion efficiency and 5:1 turndown, weighing 759 lb (344 kg).
Viessmann
The Vitocrossal 200 CM2-311 is the largest model of the small CM2 (GW6B) chassis: 222 to 1112 MBH natural-gas input (65 to 326 kW) at 95% combustion efficiency, 5:1 turndown, in a 792 lb (359 kg) unit.
Viessmann
The Vitocrossal 200 CM2-400 opens the large CM2 (GW6B) chassis: 287 to 1445 MBH natural-gas input (84 to 423 kW) at 95.1% combustion efficiency and 5:1 turndown, weighing 1495 lb (678 kg).
Viessmann
The Vitocrossal 200 CM2-500 is the mid-size model of the large CM2 (GW6B) chassis: 358 to 1800 MBH natural-gas input (105 to 527 kW) at 95.1% combustion efficiency and 5:1 turndown, weighing 1662 lb (754 kg).
Viessmann
The Vitocrossal 200 CM2-620 is the top of the CM2 (GW6B) line: 450 to 2245 MBH natural-gas input (132 to 658 kW) at 95.1% combustion efficiency and 5:1 turndown, weighing 1929 lb (875 kg).
| Specification | Viessmann Vitocrossal 200 CM2-186 | Viessmann Vitocrossal 200 CM2-246 | Viessmann Vitocrossal 200 CM2-311 | Viessmann Vitocrossal 200 CM2-400 | Viessmann Vitocrossal 200 CM2-500 | Viessmann Vitocrossal 200 CM2-620 |
|---|---|---|---|---|---|---|
| Input, minimum (natural gas) | 131 MBH | 175 MBH | 222 MBH | 287 MBH | 358 MBH | 450 MBH |
| Input, maximum (natural gas) | 663 MBH | 878 MBH | 1,112 MBH | 1,445 MBH | 1,800 MBH | 2,245 MBH |
| output-max | — | — | — | — | — | — |
| afue | — | — | — | — | — | — |
| Turndown ratio | 5:1 | 5:1 | 5:1 | 5:1 | 5:1 | 5:1 |
| vent-max-3 | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — |
| Weight | 726 lb | 759 lb | 792 lb | 1,495 lb | 1,662 lb | 1,929 lb |
Read the full comparison: Viessmann Vitocrossal 200 CM2-186 vs CM2-246 →
Read the full comparison: Viessmann Vitocrossal 200 CM2-246 vs CM2-311 →
Read the full comparison: Viessmann Vitocrossal 200 CM2-311 vs CM2-400 →
Read the full comparison: Viessmann Vitocrossal 200 CM2-400 vs CM2-500 →
Read the full comparison: Viessmann Vitocrossal 200 CM2-500 vs CM2-620 →
Error codes and alerts
Manuals
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Services for Viessmann boilers
Six models per Viessmann Canada: CM2-186, CM2-246, CM2-311, CM2-400, CM2-500 and CM2-620, covering 131 to 2245 MBH of rated input on natural gas. Two service-instruction manuals split the line: the 186–311 models (doc 5584 109 - 16) and the 400–620 models (doc 5546 489 - 15).
The Vitotronic 300, GW6B control with a 5-inch colour touchscreen, per Viessmann Canada. It works stand-alone or as a primary/secondary cascade control for up to eight boilers, so a separate cascade controller is not required. Burner-side fault codes display on the burner's BCU programming unit.
The page's efficiency rows print 95% combustion efficiency for the CM2-186/246/311 and 95.1% for the CM2-400/500/620, with a 5:1 turndown ratio. The technical data manuals separately print thermal efficiency of 97% for the small models and 95.0% for the large models.
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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.