Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The B2HE-85 and B2HE-120 are the two smallest Vitodens 200-W models and are twins below the maximum: both fire down to 8.5 MBH, both weigh 108 lb in the same cabinet, and both are rated 95% AFUE with the flagship 7-inch touchscreen. The only difference is the input ceiling — 85 MBH versus 120 MBH — so a heat-loss calculation decides which one the home needs.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 200-W B2HE-85 | Viessmann Vitodens 200-W B2HE-120 |
|---|---|---|
| Input, minimum (natural gas) | 8.5 MBH | 8.5 MBH |
| Input, maximum (natural gas) | 85 MBH | 120 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Weight | 108 lb | 108 lb |
| Domestic hot water | Not a combi; pair with an indirect tank | Not a combi; pair with an indirect tank |
Viessmann Canada publishes an 8,500 BTU/h minimum input for both the B2HE-85 and the B2HE-120, so at low fire the two boilers behave identically — a meaningful point in mild BC weather, where boilers spend most hours near their minimum. Maximum input is where they part ways: 85 MBH (24.9 kW) versus 120 MBH (35.2 kW).
Weight, cabinet and controls are shared: 108 lb (49 kg), the compact 17.75 x 19.75 x 33.75 inch dimensions, the 7-inch colour touchscreen, four heating circuit connections, built-in WiFi and Lambda Pro Plus combustion management. Both are heating-only, with domestic hot water from an indirect tank.
With identical low-fire behaviour, choosing between them is purely a question of the calculated peak: if the room-by-room heat loss plus indirect-tank recovery never approaches 85 MBH, the smaller model is sufficient — and if it does, the 120 provides the headroom without any change to the mechanical room.
Viessmann
The Vitodens 200-W B2HE-85 is the smallest model of Viessmann Canada's flagship B2HE series: 8.5 to 85 MBH input, 95% AFUE, in a 108 lb wall-hung cabinet with a 7-inch colour touchscreen.
Viessmann
The Vitodens 200-W B2HE-120 is the mid-range model of Viessmann Canada's flagship B2HE series: 8.5 to 120 MBH input at 95% AFUE in the 108 lb cabinet, covering many detached Lower Mainland homes.
Viessmann Canada lists an 8,500 BTU/h minimum input for both models, so the two differ only at the top of their range: 85 versus 120 MBH maximum.
No. Both weigh 108 lb (49 kg) and share the same compact cabinet and 95% AFUE rating; only the maximum input differs.
That follows from the heat-loss calculation. If the calculated load fits below 85 MBH the 85 is enough; beyond that the 120 adds ceiling with no footprint penalty.
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 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.