Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Gallant Wall 299 and 399 share the larger Gallant chassis, the same 72.5 MBH minimum fire and 7.4 gallons of water volume. The 399 adds 100 MBH of ceiling (399 vs 299 MBH), prints 95.1% thermal efficiency against the 299's 95% AFUE row, and lifts the AHRI net rating from 242 to 330 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Ideal Gallant Wall 299 | Ideal Gallant Wall 399 |
|---|---|---|
| Input modulation, minimum (NG & LP) | 72.5 MBH | 72.5 MBH |
| Input modulation, maximum (NG & LP) | 299 MBH | 399 MBH |
| Efficiency | 95 % | 95.1 % |
| Turndown ratio | 4.1:1 | 5.5:1 |
| AHRI net rating | 242 MBH | 330 MBH |
| DOE heating capacity | 278 MBH | 379 MBH |
| Weight | 210 lb | 216 lb |
| Water volume | 7.4 gal | 7.4 gal |
The 299 and 399 are the larger Gallant Wall models and are physically identical: 24.875 x 39.375 x 23.625 inches, 210 and 216 lb, 7.4 gallons of water volume, 1-inch gas, 1-1/2-inch supply/return and 4-inch vent/air connections. Both fire down to the same 72.5 MBH minimum, so low-load behavior is comparable.
Maximum input is the differentiator: 299 MBH on the 299 and 399 MBH on the 399, with DOE heating capacities of 278 and 379 MBH and AHRI net ratings of 242 and 330 MBH. The printed efficiency rows also differ in label: the 299 shows 95% AFUE, while the 399 shows 95.1%, footnoted on the page as thermal efficiency.
Both are ASME certified and ENERGY STAR listed with the CTRLMax control, four configurable circulator outputs and an integrated cascade function for up to six boilers. The 299 is used in Gallant Cascade kits from CPS800 upward; the 399 forms the CPS1000, CPS1200, CPS1600 and CPS2000 racks, with total inputs up to 1,995 MBH.
Ideal Heating
The Ideal Gallant Wall 299 is the mid-size Gallant model: 72.5 to 299 MBH input at 95% AFUE with a 4.1:1 turndown, stepping up to the larger 210 lb chassis with 4-inch venting and 1-inch gas.
Ideal Heating
The Ideal Gallant Wall 399 is the largest Gallant model: 72.5 to 399 MBH input with a 5.5:1 turndown, a 330 MBH AHRI net rating and a printed 95.1% figure the page footnotes as thermal efficiency.
Yes — both share the larger Gallant chassis at 7.4 gallons of water volume; the 399 weighs 216 lb against the 299's 210 lb.
Yes, both list a 72.5 MBH minimum input; the 399's extra capacity is headroom at the top of the range.
The official table prints 95% AFUE for the 299 and 95.1% for the 399, with a page footnote identifying the 399's figure as thermal efficiency.
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.