Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the Rinnai M090SN and the Rinnai M120CN belong to the Rinnai M-Series (discontinued) line of combination (combi) boilers. Published ratings: Rinnai M090SN at 17 MBH input; Rinnai M120CN at 23.5 MBH input. Rinnai M120CN lists 6.5 MBH more input than Rinnai M090SN (23.5 MBH against 17 MBH). Rinnai M120CN lists 20 lb more shipping weight than Rinnai M090SN (84 lb against 64 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Rinnai M090SN | Rinnai M120CN |
|---|---|---|
| Minimum input (hero bullet, NG) | 17 MBH | 23.5 MBH |
| Product weight | 64 lb | 84 lb |
| Product height | 31.8 in (808 mm) | 31.8 in (808 mm) |
| Product width | 17.3 in (440 mm) | 17.3 in (440 mm) |
| Product depth | 10.46 in (266 mm) | 10.46 in (266 mm) |
| Gas connection | 3/4" MNPT (19 mm) | 3/4" MNPT (19 mm) |
| Gas type (as printed) | Natural Gas | Natural Gas |
| Central heating capacity (as printed) | 90 MBH | 120 MBH |
| Maximum input (hero bullet, as printed) | N (maximum) — page print bug | 160 MBH |
| Residential ENERGY STAR | Yes | Yes |
| SCAQMD approval | Ultra Low NOx | Ultra Low NOx |
Published ratings: the Rinnai M090SN is rated 17 MBH input; the Rinnai M120CN is rated 23.5 MBH input. Rinnai M120CN lists 6.5 MBH more input than Rinnai M090SN (23.5 MBH against 17 MBH).
Rinnai M120CN lists 20 lb more shipping weight than Rinnai M090SN (84 lb against 64 lb).
Both records print the same height (31.8 in (808 mm)), width (17.3 in (440 mm)), depth (10.46 in (266 mm)) and gas connection (3/4" MNPT (19 mm)), per the cited sources.
Rinnai
The Rinnai M090SN is a discontinued Canadian M-Series heating-only solo boiler — a compact wall-mounted condensing natural-gas unit documented from the specs printed on its orphaned rinnai.ca page.
Rinnai
The Rinnai M120CN is a discontinued Canadian M-Series combi boiler — a compact wall-mounted condensing natural-gas unit documented from the specs printed on its orphaned rinnai.ca page.
The Rinnai M120CN lists 23.5 MBH, against 17 MBH on the Rinnai M090SN, per the cited documentation.
It ships at 84 lb against 64 lb for the Rinnai M090SN, per the cited sources.
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.