Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The IP060160C and IP090099C are the two smallest I-Series+ combis and share the 73 lb small chassis, 15 MBH minimum fire and 0.75 gal water content — but the 060160C is a hot-water-first unit (160 MBH DHW, 7.9 GPM) with 60 MBH of heating, while the 090099C offers 90 MBH of heating at the cost of a much smaller 99 MBH DHW side (5.3 GPM).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Rinnai IP060160C | Rinnai IP090099C |
|---|---|---|
| Heating input, minimum | 15 MBH | 15 MBH |
| Heating input, maximum | 60 MBH | 90 MBH |
| DHW input, maximum | 160 MBH | 99 MBH |
| Maximum DHW flow rate | 7.9 GPM | 5.3 GPM |
| Efficiency (AFUE) | 96 % | 96 % |
| Weight | 73 lb | 73 lb |
| Water content (CH) | 0.75 gal | 0.75 gal |
| Max. equivalent vent length, 2" | 75 ft | 100 ft |
| vent-max-3 | — | — |
Both boilers are wall-hung condensing combis in the same small chassis: 73.0 lb per the I&O manual, 18.5 x 11.5 in, 0.75 gal of CH water, 15,000 BTU/h minimum input and the same 3/4" NPT gas/DHW and 1" NPT heating connections. The comparison is really between two different balances of the same appliance.
The IP060160C caps central heating at 60 MBH of input but fires its DHW side to 160 MBH with 7.9 GPM maximum flow — it is a combi whose biggest job is hot water. The IP090099C flips that: heating input rises to 90 MBH while DHW drops to 99 MBH and 5.3 GPM, which suits a home with a bigger heating load and lighter hot-water draws.
Venting differs too: the IP060160C allows 75 equivalent feet in 2" twin pipe, while the manual gives the IP090099C 100 feet in 2" below 2,000 ft elevation (75 ft above). Efficiency is the family marketing claim of up to 96% AFUE on both; no per-model figure is printed.
Rinnai
The Rinnai IP060160C is the smallest I-Series+ combi: 15 to 60 MBH central-heating input with DHW input to 160 MBH and 7.9 GPM maximum hot-water flow in one wall-hung condensing appliance, rated up to 96% AFUE in Rinnai's Canadian marketing.
Rinnai
The Rinnai IP090099C is the I-Series+ combi with the closest CH/DHW pair: 15 to 90 MBH heating input and a 99 MBH DHW input (5.3 GPM maximum flow), rated up to 96% AFUE in Rinnai's Canadian marketing.
The IP060160C: 160 MBH of DHW input and 7.9 GPM maximum flow against the IP090099C's 99 MBH and 5.3 GPM, per the I&O manual spec table.
The IP090099C fires to 90 MBH of central-heating input versus 60 MBH on the IP060160C. Both fire down to a 15 MBH minimum.
Both weigh 73.0 lb per the manual and share the small 18.5 x 11.5 in chassis, 0.75 gal CH water content and the same supply connections.
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 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.