Rinnai Q175CN
The Rinnai Q175CN is the combination model in the Q-Series: a condensing boiler with a 175,000 BTU central-heating capacity and a 6.2 GPM maximum domestic hot water flow, at 196 lb.
Key figures
- Max input
- 175 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 35 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Rinnai Q175CN in practice
The Q175CN is one of the Q-Series condensing boilers whose official rinnai.ca pages remain live but unlinked from current navigation. The page's hero bullets print a 35,000 BTU minimum input and an unlabelled maximum of 175,000 BTU, and the Specifications table prints a 175,000 BTU central-heating capacity.
The unit weighs 196 lb / (89 kg) and measures 39.4 in wide by 31.4 in high by 15.2 in deep, with a 3/4" MNPT gas connection, 3/4" MNPT cold-inlet and hot-outlet DHW connections and a maximum domestic hot water flow rate of 6.2 GPM / (23.5 l/min). The page also prints Residential ENERGY STAR "Yes" and SCAQMD Approved "Ultra Low NOx" rows.
No AFUE percentage, turndown, venting length or water-content figure is printed on the Q page, so none is recorded here; the installation and owner manual, spec sheet and AHRI certificate are available from the product page's documentation list. The Q-Series is recorded as a legacy generation — the pages are live but the current condensing-boilers navigation lists only the IP-coded I-SERIES+ line.
Best suited to
- Homes needing both space heating and on-demand hot water from one Q-Series combi
- Central-heating loads up to the printed 175,000 BTU capacity
- Owners looking up the documented ratings of an existing Q175CN
Applicability and support
- Model number
- Q175CN
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by Rinnai. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Minimum input (hero bullet) | 35 MBH | 35,000 BTU (minimum), as printed on the page's hero bullet list. |
| Maximum input (hero bullet, as printed) | 175 MBH | 175,000 BTU (maximum), as printed. The bullet is unlabelled by side and matches the printed central-heating capacity; no separate DHW input figure is printed on the Q175CN page. |
| Output | ||
| Central heating capacity | 175 MBH | 175,000 BTU, as printed on the Specifications table. |
| Domestic hot water | ||
| Domestic hot water flow rate (maximum) | 6.2 GPM | 6.2 GPM / (23.5 l/min), as printed on the Specifications table. |
| DHW connections (cold inlet / hot outlet) | 3/4" MNPT (19 mm) | The Q175CN page prints both Cold Inlet and Hot Outlet rows at 3/4" MNPT. |
| Venting and air | ||
| Venting | Per the installation and owner manual; the page prints no venting figures | |
| Physical and connections | ||
| Product weight | 196 lb | 196 lb / (89 kg), as printed on the Specifications table. |
| Product depth | 15.2 in | 385 mm, per the product page. |
| Product height | 31.4 in | 795 mm, per the product page. |
| Product width | 39.4 in | As printed on the Specifications table. |
| Gas connection | 3/4" MNPT (19 mm) | Per the page's Supply Connections table. |
| Operating limits and other | ||
| Gas type | Natural gas | The page's Gas Type row prints Natural Gas; no propane row appears on the captured Q pages. |
| Residential ENERGY STAR | Yes | |
| SCAQMD approved | Ultra Low NOx | |
Alerts documented for this model
Frequently asked questions
What are the printed ratings of the Rinnai Q175CN?
The official page prints a 35,000 BTU minimum input, a 175,000 BTU central-heating capacity, a 196 lb weight and a 3/4" gas connection, plus a maximum domestic hot water flow of 6.2 GPM.
Does the Rinnai Q175CN make domestic hot water?
Yes. The Q175CN is the combination model in the Q-Series and prints a 6.2 GPM maximum domestic hot water flow rate with 3/4" cold-inlet and hot-outlet connections.
Is the Rinnai Q175CN still sold?
The Q-Series pages are live on rinnai.ca but are not linked from the current condensing-boilers navigation, which lists only the I-SERIES+ line. Boilers.ca records the line as a legacy generation; confirm current availability with Rinnai.
Questions about the Rinnai Q175CN?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Rinnai Canada — Q175CN product page · accessed September 9, 2026
- Rinnai Canada — condensing boilers category (lists I-SERIES+ only) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.