Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The B1KE-120 and B1KE-199 are the two combi models of the Vitodens 100-W series: both heat the house and deliver on-demand DHW through a plate heat exchanger at 95% AFUE. The 199 fires to 199 MBH instead of 120, lifts the continuous DHW draw from 3.3 to 4.7 USG/min at a 77°F rise, and moves up to a 190 lb, 39-inch cabinet from the 120's 110 lb, 33.75-inch one.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 100-W B1KE-120 | Viessmann Vitodens 100-W B1KE-199 |
|---|---|---|
| Heating input, minimum (natural gas) | 12 MBH | 19.9 MBH |
| Heating input, maximum (natural gas) | 120 MBH | 199 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Weight | 110 lb | 190 lb |
| Domestic hot water | Combi: on-demand DHW via an integrated plate heat exchanger | Combi: on-demand DHW via an integrated plate heat exchanger |
Both B1KE models are combis on the same Vitodens 100-W platform: space heating plus on-demand domestic hot water through an integrated plate heat exchanger, both rated 95% AFUE. The 120 heats at 12 to 120 MBH input (3.5 to 35.2 kW); the 199 heats at 19.9 to 199 MBH (5.8 to 58.3 kW).
The hot-water side is where combis are really sized: Viessmann Canada publishes a continuous DHW draw of 3.3 USG/min for the 120 and 4.7 USG/min for the 199 at a 77°F rise, and the technical data manual lists a 140 MBH maximum DHW input for the 120. Households whose simultaneous draws exceed the 120's continuous figure are the ones that need the 199.
The physical cost of the upgrade is real: the 199 weighs 190 lb (86 kg) against 110 lb (50 kg) and stands 39 inches tall against 33.75, matching the larger B1HE cabinet. Its 19.9 MBH minimum fire is also higher, so a low-heat-loss home should weigh the DHW benefit against reduced modulation during shoulder seasons.
Viessmann
The Vitodens 100-W B1KE-120 is Viessmann Canada's compact combi boiler: 12 to 120 MBH heating input at 95% AFUE with on-demand domestic hot water, a 3.3 USG/min continuous draw at a 77°F rise, and up to 140 MBH of DHW input per the technical data manual.
Viessmann
The Vitodens 100-W B1KE-199 is the largest combi in Viessmann Canada's 100-W series: 19.9 to 199 MBH heating input at 95% AFUE, with on-demand DHW at 4.7 USG/min continuous draw for homes with higher hot-water demand.
Continuous DHW draw rises from 3.3 to 4.7 USG/min at a 77°F rise, per Viessmann Canada, and the technical data manual lists the 120's maximum DHW input at 140 MBH.
No. The B1KE-120 weighs 110 lb (50 kg) in the 33.75-inch-tall cabinet; the B1KE-199 weighs 190 lb (86 kg) in the 39-inch cabinet shared with the larger B1HE models.
The 120 suits compact homes and households whose hot-water draws stay under its continuous 3.3 USG/min figure. The 199 is the choice when DHW demand — not necessarily the heating load — needs more headroom.
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.