Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The CB299W and CB399W share the Commodore Wall chassis and 4-inch venting, but the CB299W fires lower (46 vs 72 MBH minimum), modulates wider (6.5:1 vs 5.5:1) and prints 95.1% AFUE, while the CB399W adds 100 MBH of ceiling (399 vs 299 MBH) and prints 95.5% thermal / 95.4% combustion efficiency at a shorter 121-foot vent length.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Ideal Commodore Wall CB299W | Ideal Commodore Wall CB399W |
|---|---|---|
| Input, minimum | 46 MBH | 72 MBH |
| Input, maximum | 299 MBH | 399 MBH |
| Output | 289 MBH | 381 MBH |
| Net AHRI rating | 238 MBH | 329 MBH |
| Efficiency (AFUE) | 95.1 % | 95.5 % |
| Turndown ratio | 6.5:1 | 5.5:1 |
| Rated volume | 2.1 gal | 2.5 gal |
| Weight | 184 lb | 193 lb |
Both models are commercial wall-hung condensing boilers in the same 17.5 x 33.33 x 21.2 inch cabinet with 1-1/2-inch supply/return, 1-inch gas and 4-inch vent/air connections, Modbus standard and BACnet optional. The CB299W fires 46 to 299 MBH with a 6.5:1 turndown, 289 MBH output and a 238 MBH net AHRI rating; the CB399W fires 72 to 399 MBH with a 5.5:1 turndown, 381 MBH output and a 329 MBH net AHRI rating.
The efficiency rows are labelled differently: the CB299W is the only Commodore Wall model with a printed AFUE row, at 95.1%, while the CB399W prints 95.5% thermal and 95.4% combustion efficiency. Vent length also differs — 200 feet on the CB299W against 121 feet on the CB399W, the shortest in the line.
Both weigh under 200 lb (184 and 193 lb) and hold under 3 gallons of rated volume, and both are field-convertible between natural gas and propane. In the Commodore Wall Cascade line the CB299W opens the smallest racks (RS0600BL2D3, 598 MBH total input) while the CB399W appears from the RS0800BL2D3 (798 MBH) upward.
Ideal Heating
The Ideal Commodore Wall CB299W is the smallest commercial Commodore model: 46 to 299 MBH input at 95.1% AFUE, 6.5:1 modulation, Modbus standard and cascade capacity up to 16 boilers.
Ideal Heating
The Ideal Commodore Wall CB399W is a commercial wall-hung condensing boiler: 72 to 399 MBH input, 95.5% printed thermal efficiency, 5.5:1 turndown and a 329 MBH net AHRI rating with 4-inch venting.
The CB299W, at 6.5:1 against the CB399W's 5.5:1, with a lower 46 MBH minimum input.
The official table prints 200 feet for the CB299W and 121 feet for the CB399W — the shortest in the Commodore Wall line.
The CB299W prints 95.1% AFUE; the CB399W prints 95.5% thermal and 95.4% combustion efficiency, so the figures are not directly comparable.
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.