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Viessmann · Vitocrossal 300 (CA3B)

Viessmann Vitocrossal 300 CA3B 3.0

The Vitocrossal 300 CA3B 3.0 is the 3000 MBH size of the CA3B range: 300,000 to 3,000,000 BTU (88 to 879 kW) of natural-gas input at 96.1% thermal efficiency, rated for 160 psi, in the same 4233 lb (1920 kg) unit as the CA3B 2.5.

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Key figures

Max input
3,000 MBH
Max CSA output
—
AFUE
—
Min input
300 MBH
Natural gasPropaneHeating-onlycommercial

Input is gas energy consumed; output is heat delivered. Never size from input alone.

Viessmann Vitocrossal 300 CA3B 3.0 in practice

The CA3B 3.0 raises the CA3B range's maximum input to 3,000,000 BTU (879 kW) — 3000 MBH — while the minimum fire steps up from the 2.5's 250,000 BTU to 300,000 BTU (88 kW), per the product page's natural-gas figures.

It shares the 4233 lb (1920 kg) single-fuel weight of the CA3B 2.5, so the two smallest CA3B sizes share their footprint, lifting plan and 160 psi pressure rating. All CA3B models print 96.1% thermal efficiency.

The platform is common across sizes: SA240 316Ti Inox-Lamellar heat exchanger, fully modulating pre-mix cylinder burners, Vitotronic 300 GW6C control, common venting of up to four boilers, dual-fuel (NG/LP) availability with key changeover, altitude operation to 10,000 ft and sectioned assembly for narrow access.

Best suited to

  • Plants whose load lands between 2500 and 3000 MBH of input
  • High-load commercial systems wanting the smallest CA3B footprint at 3000 MBH
  • Cascades stepping CA3B sizes in 500 MBH increments at the entry chassis

Applicability and support

Model number
CA3B 3.0
Canadian availability
available
Production status
current
ROMA supplies
Confirmed at consultation
ROMA services
Confirmed at consultation
Warranty
Not verified

Where ROMA provides on-site service

On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.

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Specifications

Published specifications

Values as published by Viessmann. Units are shown with every value; notes flag conflicting sources or missing figures.

Viessmann Vitocrossal 300 CA3B 3.0 specifications
SpecificationValueNote
Input
Minimum input (natural gas)300 MBH300,000 BTU (88 kW), per the product page
Maximum input (natural gas)3,000 MBH3,000,000 BTU (879 kW), per the product page
Efficiency
Thermal efficiency96.1 %96.1% on all CA3B models (page/TDM: AHRI 1500 / DOE / ANSI Z21.13-CSA 4.9 / BTS-2000).
Physical and connections
Weight, single fuel4,233 lb1920 kg
Operating limits and other
Maximum operating pressure160 psig160 psi per the product page; the printed data lists a 210°F high limit.

Manuals

    Alerts documented for this model

    None documented yet.

    Services

    Related parts & service

    Frequently asked questions

    What is the firing range of the CA3B 3.0?

    Natural-gas input from 300,000 BTU (88 kW) minimum to 3,000,000 BTU (879 kW) maximum, per the product page; maximum input is 3000 MBH.

    How does the CA3B 3.0 differ from the CA3B 2.5?

    Maximum input rises from 2,500,000 to 3,000,000 BTU and the minimum fire from 250,000 to 300,000 BTU. Both weigh 4233 lb (1920 kg) and print 96.1% thermal efficiency.

    Is the CA3B 3.0 rated for high-pressure systems?

    Yes — the CA3B range is rated for 160 psi maximum operating pressure per the product page, with a 210°F high limit in the printed data.

    Questions about the Viessmann Vitocrossal 300 CA3B 3.0?

    Describe what the boiler is doing and get a straight answer about the next step.

    On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.

    Call 778-909-5731Request service

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    Sources and verification

    Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.

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