Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The two floor-standing combis share the 22 x 41 x 22 inch chassis, the Caleffi 548 separator, the internal circulator and 95% AFUE, but the 199 adds input ceiling (199,000 vs 155,000 BTU/h) and DHW delivery (5.3 vs 4.0 GPM at a 70°F rise). The 155 alone lists a 2-inch vent option; the 199 vents 3-inch up to 100 feet.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Ideal Exalt Floor Combi 155 | Ideal Exalt Floor 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 | 181 lb | 191 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 floor combis heat the building and produce domestic hot water on demand. Heating ranges are 19,375 to 155,000 BTU/h (combi 155) and 24,875 to 199,000 BTU/h (combi 199), both at 95% AFUE with an 8:1 turndown and DOE capacities of 142 and 184 MBH. DHW output is 4.0 GPM at a 70°F rise on the 155 and 5.3 GPM on the 199, with the same 0.5 GPM minimum flow and 150 psi maximum DHW pressure.
Both ship with the floor platform's Caleffi 548 series separator with air elimination and a pre-installed internal circulator, with left-or-right water and gas connections. Venting: the 155 lists 2-inch up to 33 equivalent feet and 3-inch up to 100 feet; the 199 lists 3-inch up to 100 feet.
Weight rises from 181 to 191 lb and water volume from 3 to 4 gallons in the same cabinet. Both use CTRLMax with DHW priority, outdoor reset and plain-text diagnostics, and both are published in natural-gas and propane versions. Households whose simultaneous hot-water demand exceeds 4.0 GPM are the ones that need the 199.
Ideal Heating
The Ideal Exalt Floor Combi 155 is a floor-standing combi: 19,375 to 155,000 BTU/h heating input at 95% AFUE with 4.0 GPM on-demand DHW at a 70°F rise, an included separator and circulator, in a 181 lb chassis.
Ideal Heating
The Ideal Exalt Floor Combi 199 is the largest floor-standing combi in the Exalt line: 24,875 to 199,000 BTU/h heating input at 95% AFUE with 5.3 GPM on-demand DHW at a 70°F rise in a 191 lb chassis.
5.3 GPM at a 70°F rise against 4.0 GPM for the 155, with 4.9 vs 3.7 GPM at 75°F and 4.6 vs 3.5 GPM at 80°F.
Yes — both list the Caleffi 548 series separator with air elimination and a pre-installed internal circulator.
The combi 155, up to 33 equivalent feet. The combi 199 lists 3-inch venting up to 100 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.