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Comparison
Verdict in brief
Moving from the CI2-1000 to the CI2-1500 is a step across the CI2 chassis groups: the 1500 weighs 1812 lb against the 1000's 963 lb, holds 113 USG of water against 50, and prints 96.6% combustion efficiency against 96.8%. Its firing range widens to 50 to 1500 MBH — the lowest minimum in the series with 500 MBH more ceiling — so plant layout and lifting change even though low-fire behaviour improves.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitocrossal 200 CI2-1000 | Viessmann Vitocrossal 200 CI2-1500 |
|---|---|---|
| Rated input, minimum (natural gas/LPG) | 100 MBH | 50 MBH |
| Rated input, maximum (natural gas/LPG) | 1,000 MBH | 1,500 MBH |
| Combustion efficiency | 96.8 % | 96.6 % |
| Weight | 963 lb | 1,812 lb |
| Boiler water content | 50 USG | 113 USG |
The CI2-1000 is the top of the CI2 middle chassis; the CI2-1500 opens the large chassis. The 1500's printed range runs from a 50,000 BTU (14.7 kW) minimum — matching the entry models and well below the 1000's 100,000 BTU (29.3 kW) floor — up to 1,500,000 BTU (440 kW), the widest range printed in the series.
The physical step is substantial: weight nearly doubles from 963 lb (437 kg) to 1812 lb (822 kg), and water content rises from 50 to 113 USG — the highest water-content row of any CI2 model, above even the CI2-2000's 99 USG. The printed efficiency rows ease from 96.8% to 96.6% across the chassis step, and the CI2-1500 runs two burner control units.
Both models carry the Inox-Crossal heat exchanger, MatriX cylinder burner and Lambda PrO₂ trim on the Viessmann One Base platform. The 1500 is the choice when per-boiler capacity toward 1500 MBH is needed; its higher water volume also suits systems where mass helps steady burner run times, while the 1000 keeps the lighter middle chassis for loads that stay below its ceiling.
Viessmann
The Vitocrossal 200 CI2-1000 is the first 1000 MBH model of the CI2 line: 100 to 1000 MBH rated input (29.3 to 293 kW) at 96.8% combustion efficiency, in the 963 lb (437 kg) middle chassis with 50 USG of boiler water content.
Viessmann
The Vitocrossal 200 CI2-1500 is the first model of the CI2 large chassis: 50 to 1500 MBH rated input (14.7 to 440 kW) — the widest printed firing range in the series — at 96.6% combustion efficiency, weighing 1812 lb (822 kg) with 113 USG of boiler water content.
1812 lb (822 kg) versus 963 lb (437 kg), per Viessmann Canada — nearly double. Water content rises from 50 to 113 USG across the chassis step.
Lower: 50,000 BTU (14.7 kW) against the CI2-1000's 100,000 BTU (29.3 kW) floor, giving the 1500 the widest printed firing range in the series.
The printed rows ease from 96.8% (CI2-1000) to 96.6% (CI2-1500) as sizes grow toward the 96.5% figure on the CI2-2000.
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.