Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The CB3000F and CB4000F are the largest Commodore Floor models, sharing 4-inch Victaulic water connections, 2-inch gas and 150-foot vent runs. The CB4000F adds 1,000 MBH of ceiling, prints the catalogue's highest thermal efficiency at 99.9% against the CB3000F's 99.0%, and uses the widest 12-inch/12-inch vent connection in a 2,314 lb chassis.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Ideal Commodore Floor CB3000F | Ideal Commodore Floor CB4000F |
|---|---|---|
| Input, minimum | 420 MBH | 500 MBH |
| Input, maximum | 3,000 MBH | 4,000 MBH |
| Output | 2,858 MBH | 3,920 MBH |
| Net AHRI rating | 2,485 MBH | 3,409 MBH |
| Thermal efficiency | 99 % | 99.9 % |
| Combustion efficiency | 97.5 % | 98 % |
| Turndown ratio | 7.2:1 | 8:1 |
| Rated volume | 34.6 gal | 45.3 gal |
| Weight | 1,984 lb | 2,314 lb |
The CB3000F and CB4000F are the top of the Commodore Floor line. Both use 4-inch Victaulic supply/return, 2-inch NPT gas and a 150-foot published vent length, and both are field-convertible between natural gas and propane with Modbus standard and BACnet optional. The CB3000F fires 420 to 3,000 MBH with a 7.2:1 turndown, 2,858 MBH output and a 2,485 MBH net AHRI rating; the CB4000F fires 500 to 4,000 MBH with an 8:1 turndown, 3,920 MBH output and a 3,409 MBH net AHRI rating.
Printed efficiency favours the larger model: 99.9% thermal and 98.0% combustion on the CB4000F against 99.0% thermal and 97.5% combustion on the CB3000F — and the page's 'market leading thermal efficiency up to 99.9%' headline belongs to the CB4000F.
The chassis grows from 79 x 59 x 46 inches, 1,984 lb and 34.6 gallons rated volume on the CB3000F to 95.5 x 59 x 46 inches, 2,314 lb and 45.3 gallons on the CB4000F, and vent/air connections step from 10-inch/12-inch to 12-inch/12-inch. Both cascade up to 16 boilers; the design load decides whether the CB3000F's ceiling is enough or the plant needs the CB4000F.
Ideal Heating
The Ideal Commodore Floor CB3000F is a large commercial condensing boiler: 420 to 3,000 MBH input, 99.0% printed thermal efficiency, 4-inch Victaulic water connections and 10-inch/12-inch venting in a 1,984 lb chassis.
Ideal Heating
The Ideal Commodore Floor CB4000F is the largest model in the line: 500 to 4,000 MBH input with the catalogue's highest printed thermal efficiency at 99.9%, a 3,409 MBH net AHRI rating and 12-inch/12-inch venting.
The CB4000F, at 99.9% thermal and 98.0% combustion efficiency — the highest thermal figure in the Ideal Heating North America catalogue.
The CB3000F uses 10-inch/12-inch vent/air connections; the CB4000F uses 12-inch/12-inch, both with a 150-foot published vent length.
1,984 lb for the CB3000F with 34.6 gallons rated volume, and 2,314 lb for the CB4000F with 45.3 gallons, per the official model table.
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.