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Comparison
Verdict in brief
Stepping from the B2HA-352 to the B2HA-399 raises the maximum input from 352,000 to 399,000 BTU (103 to 117 kW) but changes the boiler's character: the minimum fire climbs from 71,000 to 113,000 BTU (21 to 33 kW), the cabinet grows to the 298 lb (135 kg), 23.5 x 27 x 44.5-inch chassis, and the printed efficiency row drops from 94.5% to 93.9% thermal efficiency (ANSI Z21,13/CSA 4.9).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitodens 200-W B2HA-352 | Viessmann Vitodens 200-W B2HA-399 |
|---|---|---|
| Input, minimum (natural gas) | 71 MBH | 113 MBH |
| Input, maximum (natural gas) | 352 MBH | 399 MBH |
| Thermal efficiency (ANSI Z21,13/CSA 4.9) | 94.5 % | 93.9 % |
| Weight | 194 lb | 298 lb |
| Width | 19 in | 23.5 in |
| Depth | 21 in | 27 in |
| Height | 43.5 in | 44.5 in |
The B2HA-352 is the top model of the B2HA mid chassis; the B2HA-399 opens the large chassis. Maximum input rises from 352,000 BTU (103 kW) to 399,000 BTU (117 kW), but the minimum fire also rises — 71,000 BTU (21 kW) on the 352 against 113,000 BTU (33 kW) on the 399 — so a low-load home would see the 399 idle higher before it can modulate down.
The physical step is real: weight goes from 194 lb (88 kg) to 298 lb (135 kg), and the cabinet grows from 19 x 21 x 43.5 inches to 23.5 x 27 x 44.5 inches (480 x 530 x 1105 mm to 600 x 689 x 1128 mm). The wall, doorways and lifting plan all change.
The printed efficiency rows also differ: 94.5% thermal efficiency (ANSI Z21,13/CSA 4.9) for the 352 against 93.9% for the 399, with page marketing copy separately citing an 'up to 95% AFUE rating'. The 399 earns its place only when the heat-loss calculation genuinely approaches its ceiling.
Viessmann
The Vitodens 200-W B2HA-352 is the largest model in the 194 lb B2HA cabinet: 71,000 to 352,000 BTU (21 to 103 kW) of input at a printed 94.5% thermal-efficiency row (ANSI Z21,13/CSA 4.9), for the biggest loads that still fit one wall-hung boiler.
Viessmann
The Vitodens 200-W B2HA-399 opens the larger B2HA chassis: 113,000 to 399,000 BTU (33 to 117 kW) of input in the 298 lb wall-hung condensing boiler, with a printed thermal-efficiency row (ANSI Z21,13/CSA 4.9) of 93.9%.
Weight rises from 194 lb (88 kg) to 298 lb (135 kg), and the cabinet grows from 19 x 21 x 43.5 inches to 23.5 x 27 x 44.5 inches, per Viessmann Canada.
Maximum input rises from 352,000 to 399,000 BTU, but minimum fire also rises from 71,000 to 113,000 BTU, so the 399 idles at a higher floor in low-load conditions.
The page prints 93.9% thermal efficiency (ANSI Z21,13/CSA 4.9) for the B2HA-399 against 94.5% for the B2HA-352 — the figures as printed, separate from the page's 'up to 95% AFUE' marketing claim.
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.