Rinnai Q175SN
The Rinnai Q175SN is a heating-only model in the Q-Series: a condensing boiler with a 175,000 BTU central-heating capacity and no domestic hot water production, at 141 lb.
Key figures
- Max input
- N (maximum) — page print bug
- Max CSA output
- —
- AFUE
- —
- Min input
- 35 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Rinnai Q175SN in practice
The Q175SN 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, with the maximum-input bullet truncated to "N (maximum)", and the Specifications table prints a 175,000 BTU central-heating capacity.
The unit weighs 141 lb / (64 kg) and measures 26 in wide by 31.4 in high by 15.2 in deep, with a 3/4" MNPT gas connection and no DHW connections, because it is heating-only. 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
- Heating-only hydronic systems sized within the printed 175,000 BTU capacity
- Homes that keep domestic hot water on a separate tank or heater
- Owners looking up the documented ratings of an existing Q175SN
Applicability and support
- Model number
- Q175SN
- 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) | N (maximum) — page print bug | Every Q-Series solo page prints its maximum-input hero bullet as 'N (maximum)', a truncated value on the page. No numeric maximum is printed on the solo pages, so the bullet is recorded as printed rather than reading 'N' as 'no maximum'. |
| Output | ||
| Central heating capacity | 175 MBH | 175,000 BTU, as printed on the Specifications table. |
| Venting and air | ||
| Venting | Per the installation and owner manual; the page prints no venting figures | |
| Physical and connections | ||
| Product weight | 141 lb | 141 lb / (64 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 | 26 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 Q175SN?
The official page prints a 35,000 BTU minimum input, a 175,000 BTU central-heating capacity, a 141 lb weight and a 3/4" gas connection (the maximum-input bullet is printed as the truncated "N (maximum)").
Does the Rinnai Q175SN make domestic hot water?
No. The Q175SN is heating-only: it has no DHW circuit, so hot water is supplied by a separate tank or heater.
Is the Rinnai Q175SN 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 Q175SN?
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 — Q175SN 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.