Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The two Exalt Wall combi models share the 21.75 x 33 x 16.5 inch cabinet, 95% AFUE and 8:1 turndown, but the 199 delivers more of everything: 199,000 vs 155,000 BTU/h heating input and 5.3 vs 4.0 GPM of on-demand DHW at a 70°F rise. The 155 is the only one that lists 2-inch venting (33 ft); the 199 vents with 3-inch pipe up to 100 ft.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Ideal Exalt Wall Combi 155 | Ideal Exalt Wall Combi 199 |
|---|---|---|
| Input, minimum (NG & LP) | 19.375 MBH | 24.875 MBH |
| Input, maximum (NG & LP) | 155 MBH | 199 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown ratio | 8:1 | 8:1 |
| DOE heating capacity | 142 MBH | 184 MBH |
| AHRI net rating | 123 MBH | 159 MBH |
| DHW output at 70°F rise | 4 GPM | 5.3 GPM |
| DHW minimum flow rate | 0.5 GPM | 0.5 GPM |
| Weight | 110 lb | 128 lb |
| Domestic hot water | Combi: on-demand DHW via an integrated plate heat exchanger | Combi: on-demand DHW via an integrated plate heat exchanger |
Both combis heat the building and produce domestic hot water on demand through an integrated plate heat exchanger. The heating ranges are 19,375 to 155,000 BTU/h on the combi 155 and 24,875 to 199,000 BTU/h on the combi 199, both at 95% AFUE with an 8:1 turndown. DOE heating capacity steps from 142 to 184 MBH and the AHRI net rating from 123 to 159 MBH.
Hot-water delivery is the real divider: 4.0 GPM at a 70°F rise on the 155 against 5.3 GPM on the 199, with 3.7 vs 4.9 GPM at 75°F and 3.5 vs 4.6 GPM at 80°F. Both list a 0.5 GPM minimum flow, a 150 psi maximum DHW pressure and a 150°F (65°C) DHW temperature ceiling.
The cabinet is identical at 21.75 x 33 x 16.5 inches, with weight rising from 110 to 128 lb and water volume from 3 to 4 gallons. Venting differs: the 155 lists 2-inch up to 33 feet and 3-inch up to 100 feet, while the 199 lists 3-inch up to 100 feet only. Both use CTRLMax with DHW priority and plain-text diagnostics, and both ship in natural-gas and propane versions.
Ideal Heating
The Ideal Exalt Wall Combi 155 is a wall-hung combi boiler: 19,375 to 155,000 BTU/h heating input at 95% AFUE with on-demand DHW at 4.0 GPM at a 70°F rise, in a 110 lb cabinet with 2-inch venting up to 33 feet.
Ideal Heating
The Ideal Exalt Wall Combi 199 is the larger wall-hung combi: 24,875 to 199,000 BTU/h heating input at 95% AFUE with on-demand DHW at 5.3 GPM at a 70°F rise and 3-inch venting up to 100 feet.
The combi 199, at 5.3 GPM at a 70°F rise against 4.0 GPM for the combi 155, per the official model table.
Yes — 21.75 x 33 x 16.5 inches; the 199 weighs 128 lb against 110 lb and holds 4 gallons against 3.
No. The 2-inch vent option (33 ft) is published for the combi 155; the combi 199 lists 3-inch venting up to 100 equivalent feet.
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.