Ideal Heating · Commodore Wall
Ideal Commodore Wall CB399W
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.
Key figures
- Max input
- 399 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 72 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Ideal Commodore Wall CB399W in practice
The CB399W sits in the middle of the Commodore Wall range: 72 to 399 MBH input with a 5.5:1 turndown, 381 MBH output and a 329 MBH net AHRI rating. Its printed efficiency rows are 95.5% thermal and 95.4% combustion. The minimum fire of 72 MBH matches the CB470W's, while the CB299W fires lower at 46 MBH.
It shares the Commodore Wall chassis — 17.5 x 33.33 x 21.2 inches at 193 lb with 2.5 gallons rated volume — and the line's 1-1/2-inch supply/return, 1-inch gas and 4-inch vent/air connections. The published vent length for this model is 121 feet, the shortest of the four Commodore Wall models. Modbus is standard, BACnet optional, and fuel is field-convertible.
The CB399W appears in several Commodore Wall Cascade rack configurations, including the RS0800BL2D3 (two boilers, 798 MBH total input) and larger racks up to six boilers. Cascade capacity reaches 16 boilers. No explicit Canadian sales statement was found on the official pages checked on 2026-09-09; the Exalt and Gallant submittals list ANSI Z21.13 and CSA 4.9 compliance, so Boilers.ca records canadianStatus as unknown.
Best suited to
- Commercial plants between roughly 300 and 400 MBH per boiler
- Commodore Wall Cascade racks from 798 MBH upward
- Projects that need 4-inch venting on a 200-foot-class plant layout
Applicability and support
- Model number
- CB399W
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
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.
Specifications
Published specifications
Values as published by Ideal Heating. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, minimum | 72 MBH | Per the official model table. |
| Input, maximum | 399 MBH | Per the official model table. |
| Output | ||
| Output | 381 MBH | Heating capacity under 300 MBH input; gross output above 300 MBH, per the page footnote. |
| Net AHRI rating | 329 MBH | Per the official model table. |
| Efficiency | ||
| Thermal efficiency | 95.5 % | 95.5% thermal efficiency and 95.4% combustion efficiency printed for the CB399W. |
| Domestic hot water | ||
| Domestic hot water | Heating-only commercial boiler; DHW via a separate water heater or tank | |
| Venting and air | ||
| Flue connection, vent / air | 4 in | |
| Vent length | 121 ft | Per the official model table. |
| Physical and connections | ||
| Weight | 193 lb | |
| Width | 17.5 in | |
| Height | 33.33 in | |
| Depth | 21.2 in | |
| Operating limits and other | ||
| Turndown ratio | 5.5:1 | Per the official model table. |
| Rated volume | 2.5 gal | Per the official model table. |
| Supply / return water connections (MNPT) | 1-1/2 in | Per the official model table. |
| Gas connection (NPT) | 1 in | |
Manuals
Alerts documented for this model
Frequently asked questions
What efficiency does the Commodore Wall CB399W print?
95.5% thermal efficiency and 95.4% combustion efficiency, with 381 MBH output and a 329 MBH net AHRI rating at a 72 to 399 MBH input range.
What is the vent length of the CB399W?
The official model table prints 121 feet — the shortest published vent length among the four Commodore Wall models, which otherwise list 200 feet.
How much water does the CB399W hold?
2.5 gallons rated volume, per the official model table.
Questions about the Ideal Commodore Wall CB399W?
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.
Sources and verification
- Ideal Heating NA — Commodore Wall Mount product page and model table · accessed September 9, 2026
- Ideal Heating NA — Commodore Wall CB submittal sheet (2025-122, rev. 9.8.25) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.