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Comparison
Verdict in brief
Both the Ideal Commodore Wall CB399W and the Ideal Commodore Wall CB470W belong to the Ideal Heating Commodore Wall line of condensing boilers. Published ratings: Ideal Commodore Wall CB399W at 72–399 MBH input, 381 MBH output and 95.5% efficiency; Ideal Commodore Wall CB470W at 83–470 MBH input, 453 MBH output and 95.6% efficiency. Ideal Commodore Wall CB470W lists 71 MBH more input than Ideal Commodore Wall CB399W (470 MBH against 399 MBH). Ideal Commodore Wall CB470W carries the higher published efficiency at 95.6%, against 95.5%. Ideal Commodore Wall CB470W lists 5 lb more shipping weight than Ideal Commodore Wall CB399W (198 lb against 193 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Ideal Commodore Wall CB399W | Ideal Commodore Wall CB470W |
|---|---|---|
| Input, minimum | 72 MBH | 83 MBH |
| Input, maximum | 399 MBH | 470 MBH |
| Turndown ratio | 5.5:1 | 5.7:1 |
| Domestic hot water | Heating-only commercial boiler; DHW via a separate water heater or tank | Heating-only commercial boiler; DHW via a separate water heater or tank |
| Weight | 193 lb | 198 lb |
| Height | 33.33 in | 33.33 in |
| Width | 17.5 in | 17.5 in |
| Depth | 21.2 in | 21.2 in |
| Vent length | 121 ft | 200 ft |
| Supply / return water connections (MNPT) | 1-1/2 in | 1-1/2 in |
| Gas connection (NPT) | 1 in | 1 in |
| Output | 381 MBH | 453 MBH |
| Net AHRI rating | 329 MBH | 394 MBH |
| Thermal efficiency | 95.5 % | 95.6 % |
| Rated volume | 2.5 gal | 2.7 gal |
| Flue connection, vent / air | 4 in | 6 in |
Published ratings: the Ideal Commodore Wall CB399W is rated 72–399 MBH input, 381 MBH output and 95.5% efficiency; the Ideal Commodore Wall CB470W is rated 83–470 MBH input, 453 MBH output and 95.6% efficiency. Ideal Commodore Wall CB470W lists 71 MBH more input than Ideal Commodore Wall CB399W (470 MBH against 399 MBH). Ideal Commodore Wall CB470W carries the higher published efficiency at 95.6%, against 95.5%.
Ideal Commodore Wall CB470W lists 5 lb more shipping weight than Ideal Commodore Wall CB399W (198 lb against 193 lb). The turndown differs: the Ideal Commodore Wall CB399W lists 5.5:1, while the Ideal Commodore Wall CB470W lists 5.7:1. The vent length differs: the Ideal Commodore Wall CB399W lists 121 ft, while the Ideal Commodore Wall CB470W lists 200 ft. The rated volume differs: the Ideal Commodore Wall CB399W lists 2.5 gal, while the Ideal Commodore Wall CB470W lists 2.7 gal.
Both records print the same domestic-hot-water arrangement (Heating-only commercial boiler; DHW via a separate water heater or tank), height (33.33 in), width (17.5 in) and depth (21.2 in), per the cited sources.
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.
Ideal Heating
The Ideal Commodore Wall CB470W is a commercial wall-hung condensing boiler: 83 to 470 MBH input with the line's highest printed thermal efficiency at 95.6%, a 394 MBH net AHRI rating and 6-inch venting.
The Ideal Commodore Wall CB470W lists 470 MBH, against 399 MBH on the Ideal Commodore Wall CB399W, per the cited documentation.
The Ideal Commodore Wall CB470W carries the higher published efficiency at 95.6%, against 95.5%.
It ships at 198 lb against 193 lb for the Ideal Commodore Wall CB399W, per the cited sources.
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.