Peerless Boilers · Series MIHII
Peerless Series MIHII MIHII-03
The Peerless Series MIHII MIHII-03 is the smallest Series MIHII size of the legacy mid-efficiency cast-iron gas water line: 65 MBH fixed input for 55 MBH heating capacity and a 48 MBH net water rating at 84.1% AFUE, with 4.72 US gallons of boiler water content, a low-water cutoff and natural-draft venting.
Key figures
- Max input
- —
- Max CSA output
- —
- AFUE
- 84.1 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Peerless Series MIHII MIHII-03 in practice
The Series MIHII MIHII-03 is a legacy fixed-input cast-iron gas hot water boiler rated at 65 MBH input with 55 MBH heating capacity and a 48 MBH net water rating (piping and pickup allowance 1.15) at 84.1% AFUE per the ratings table on the official product page. Boiler water content is 4.72 US gallons.
The MIHII is natural gas only and is positioned by the official page for 'markets where utility companies offer rebates for mid-efficiency heating products'; it is an adaptation of the Series MI with the same features plus a low-water cutoff for safe operation, an integral draft diverter and spark-pilot ignition. The line is grouped under 'Out of Circulation' on the official site.
Boilers.ca documents this size at model level; no official Canadian-sales statement was found, so canadianStatus stays 'unknown'. Installation, gas, combustion and venting work belongs with a licensed contractor against the shared I&O manual MI8038 R19 (10/19).
Best suited to
- Owners documenting an installed Series MIHII against the official ratings table (65 MBH input)
- Mid-efficiency replacement research with a low-water cutoff requirement
- Natural-gas-only systems in the legacy Peerless cast-iron size class
Applicability and support
- Model number
- MIHII-03
- Canadian availability
- unknown
- 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 Peerless Boilers. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 65 MBH | Fixed input per the in-page ratings table on the official product page. |
| Output | ||
| Heating capacity | 55 MBH | Heating capacity per the in-page ratings table on the official product page. |
| Net water rating | 48 MBH | Net water rating based on a piping and pickup allowance of 1.15 per the in-page ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 84.1 % | AFUE per the in-page ratings table; ratings are based on U.S. Government tests. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Venting | Natural draft into a conventional chimney | Fully packaged for conventional chimney applications with a front-facing integral draft diverter and a low-profile design (official product page). |
| Physical and connections | ||
| Boiler water content | 4.72 gal | Boiler water content 4.72 US gallons per the in-page ratings table. |
| Operating limits and other | ||
| Fuel | Natural gas | Gas-Fired (Natural) per the official product page. |
| Ignition and controls | Spark pilot ignition; low-water cutoff | The MIHII is equipped with a low-water cutoff for safe operation and shares the Series MI platform (official product page). |
Manuals
- Series MI & MIHII Installation, Operation & Maintenance Manual (MI8038 R19, 10/19)MI8038 R19 · 2019-10
- Series MI85, MIHII & MI User's Information Manual (MI8082 R6, 10/19)MI8082 R6 · 2019-10
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the MIHII-03's ratings?
65 MBH fixed input, 55 MBH heating capacity and a 48 MBH net water rating at 84.1% AFUE per the product page ratings table.
Does the MIHII-03 run on propane?
No — the official product page lists the Series MIHII as Gas-Fired (Natural) only.
Is the MIHII-03 still sold?
No — the official site groups the Series MIHII under 'Out of Circulation' (verified September 9, 2026); the record documents the installed equipment and its I&O manual.
Questions about the Peerless Series MIHII MIHII-03?
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
- Peerless Boilers — Series MIHII product page (ratings and dimensions tables) · accessed September 9, 2026
- Series MI & MIHII Installation, Operation & Maintenance Manual, MI8038 R19 (10/19) (PDF) · MI8038 R19 · accessed September 9, 2026
- Series MI85, MIHII & MI User's Information Manual, MI8082 R6 (10/19) (PDF) · MI8082 R6 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.