Rinnai IP150199C
The Rinnai IP150199C is the top of the fully documented I-Series+ combi range: 15 to 150 MBH central-heating input with a 199 MBH DHW side (9.8 GPM maximum), the largest small-chassis combi at 76.1 lb.
Key figures
- Max input
- 150 MBH
- Max CSA output
- —
- AFUE
- 96 %
- Min input
- 15 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Rinnai IP150199C in practice
The IP150199C tops the small-chassis combi group at 150,000 BTU/h of central-heating input while the DHW module fires to 199,000 BTU/h with 9.8 GPM maximum flow — enough headroom for most detached-house loads from one wall-hung unit. It is the largest model covered in full on Boilers.ca; the 175,000 and 199,000 BTU/h combis beyond it remain draft records pending review of raster-only manuals.
Specs come from the English I&O manual, doc 800000190(02): 76.1 lb (34.5 kg) against a product page that prints 62 lb (28.1 kg) — a documented discrepancy, with the manual figure used here — plus 0.88 gal CH water content and the 10.9 sq ft heat exchanger shared with the IP120199C.
Venting options are 2" twin pipe to 75 equivalent feet or 3" to 160 equivalent feet, and the unit keeps the small-chassis footprint (18.5 x 11.5 in) with 1" NPT heating connections. Family efficiency claim is up to 96% AFUE; the manual prints no per-model AFUE figure.
Best suited to
- Larger homes whose heat-loss calculation approaches 150 MBH of input
- Households wanting maximum small-chassis heating reach plus 9.8 GPM DHW
- Owners who prefer a wall-hung combi to a floor-standing boiler at this capacity
Applicability and support
- Model number
- IP150199C
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
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 | ||
| Heating input, minimum | 15 MBH | Space-heating input; 15,000 BTU/h minimum input per spec Table 2. |
| Heating input, maximum | 150 MBH | Space-heating (CH) maximum input per spec Table 2. |
| Efficiency | ||
| Efficiency (AFUE) | 96 % | Up to 96% AFUE per Rinnai Canada marketing copy and the Canadian brochure; no per-model AFUE figure is printed in the I&O manual spec tables. |
| Domestic hot water | ||
| DHW input, maximum | 199 MBH | 199,000 BTU/h maximum DHW input per spec Table 2. |
| Maximum DHW flow rate | 9.8 GPM | 9.8 GPM (37 L/min) per spec Table 2; 5.1 GPM at a 70°F rise. The product page lists 9.8 GPM. |
| Domestic hot water | On demand inside the combi | DHW input and flow figures above; DHW temperature setting range 98°F-140°F (37°C-60°C) per spec Table 2. |
| Venting and air | ||
| Venting | 2" nominal PVC/polypropylene or 3" x 5" concentric | Vent connection per the I&O manual; direct-vent (concentric or twin-pipe) and room-air options are covered in the manual's venting section. |
| Max. equivalent vent length, 2" | 75 ft | Twin-pipe 2" PVC / 2" PP maximum equivalent length per the I&O manual (Table 20). |
| Max. equivalent vent length, 3" | 160 ft | Twin-pipe 3" PVC / 3" PP maximum equivalent length per the I&O manual (Table 20). |
| Physical and connections | ||
| Weight | 76.1 lb | 76.1 lb (34.5 kg) per the I&O manual spec Table 2; the product page prints 62 lb (28.1 kg) — a page/manual discrepancy; the manual figure is used here. |
| Water content (CH) | 0.88 gal | Central-heating water content per spec Table 2. |
| Gas connection | 3/4" NPT | Per spec Table 3. |
| Heating water connections | 1" NPT | CH supply and return per spec Table 3. |
| DHW connections | 3/4" NPT | DHW cold inlet and hot outlet per spec Table 3. |
| Width | 18.5 in (470 mm) | Per the I&O manual dimension figure and the product page. |
| Depth | 11.5 in (291 mm) | Per the I&O manual dimension figure; the product page lists 292.1 mm. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Gas supply pressure per spec Table 2: NG 3.5-10.5 in. W.C. (0.87-2.61 kPa); propane 8.0-13.5 in. W.C. (1.99-3.36 kPa). |
| CH water pressure | 13 – 45 psi | Minimum 13 PSI (90 kPa), maximum 45 PSI (310 kPa); recommended 17-26 PSI; 30 PSI pressure relief valve included with the system (spec Table 2). |
Manuals
Alerts documented for this model
Frequently asked questions
What is the largest combi documented on Boilers.ca?
The IP150199C (150 MBH CH input) is the largest fully documented I-Series+ combi. The IP175199C and IP199199C are sold in Canada but their English I&O manuals are raster-only, so they remain draft records pending review.
Does the IP150199C share parts with the IP120199C?
Both use the same small chassis and the 10.9 sq ft heat exchanger and hold 0.88 gal of CH water, per the manual; the difference is the 150 MBH versus 120 MBH heating input rating.
Why does the product page weight differ from the manual?
Rinnai's page prints 62 lb for both the 120 and 150 models while the I&O manual spec table prints 76.1 lb (34.5 kg). Boilers.ca uses the manual figure and documents the discrepancy.
Questions about the Rinnai IP150199C?
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.
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Sources and verification
- Rinnai Canada — IP150199C product page · accessed September 7, 2026
- Rinnai Canada — condensing boilers · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.