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Comparison
Verdict in brief
The B2TA 19 and B2TA 35 are the two sizes of the earlier Vitodens 222-F generation: both 93.3% AFUE, both 282 lb (128 kg) with an integrated 26.5 USG (100 L) DHW tank. The 35 fires to 125 MBH against the 19's 67 MBH and doubles the continuous DHW draw from 1.8 to 3.3 USG/min at a 70°F rise, with a 60 vs 44 USG ten-minute peak.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 222-F B2TA 19 | Viessmann Vitodens 222-F B2TA 35 |
|---|---|---|
| CSA input, minimum (NG/LPG) | 12 MBH | 19 MBH |
| CSA input, maximum (NG/LPG) | 67 MBH | 125 MBH |
| CSA output / DOE heating capacity | 10.9-61 MBH | 17.4-114 MBH |
| Net AHRI rating | 53 MBH | 99 MBH |
| Efficiency (AFUE) | 93.3 % | 93.3 % |
| Integrated DHW tank | 26.5 USG (100 L) | 26.5 USG (100 L) |
| Continuous DHW draw at 70°F rise | 1.8 USG/min | 3.3 USG/min |
| Maximum DHW draw over 10 minutes | 44 USG | 60 USG |
| Weight | 282 lb | 282 lb |
Both B2TA models are floor-standing condensing combis with the same 26.5 USG (100 L) stainless steel DHW tank, 282 lb (128 kg) weight, 0.87 USG boiler water content, 45 psig rating and 595 x 600 x 1625 mm cabinet. Both print 93.3% AFUE on a combined NG/LPG input row.
Heating ranges differ: 12-67 MBH (3.5-20 kW) on the 19 with a 53 MBH Net AHRI rating, against 19-125 MBH (5.5-37 kW) on the 35 with 99 MBH. The DHW side scales with the burner: 1.8 USG/min continuous and a 44 USG ten-minute peak on the 19, against 3.3 USG/min and 60 USG on the 35, both at a 70°F rise with the same 4,435 BTU/24h standby loss.
Neither model can be common-vented with any other appliance. Households whose simultaneous hot-water demand exceeds the 19's 1.8 USG/min continuous draw are the ones that need the 35; the 35's higher 19 MBH minimum fire is the trade-off in low-load conditions.
Viessmann
The Vitodens 222-F B2TA 19 is the smaller of the two earlier-generation 222-F combis: 12 to 67 MBH NG/LPG input at 93.3% AFUE with an integrated 26.5 USG (100 L) DHW tank and a 1.8 USG/min continuous draw at a 70°F rise.
Viessmann
The Vitodens 222-F B2TA 35 is the larger of the two earlier-generation 222-F combis: 19 to 125 MBH NG/LPG input at 93.3% AFUE with an integrated 26.5 USG (100 L) DHW tank and a 3.3 USG/min continuous draw at a 70°F rise.
Yes. Both weigh 282 lb (128 kg) and measure 595 x 600 x 1625 mm, with the same 26.5 USG (100 L) integrated DHW tank.
Continuous draw rises from 1.8 to 3.3 USG/min at a 70°F rise, and the ten-minute peak from 44 to 60 USG.
The B2TA 19, at 12 MBH (3.5 kW) against the B2TA 35's 19 MBH (5.5 kW), giving it closer tracking of small heating loads.
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.