Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Peerless Boilers · Series
The Series MIHII is Peerless' legacy mid-efficiency residential cast-iron gas water boiler — four sizes MIHII-03 through MIHII-06 from 65 to 162.5 MBH input at 84.0–84.1% AFUE, with a low-water cutoff, natural-draft integral draft diverter and spark-pilot ignition. The official site groups the line under 'Out of Circulation'.
Series facts
The in-page ratings table prints 84.1% AFUE on the MIHII-03 and MIHII-04 and 84.0% on the MIHII-05 and MIHII-06; the page copy headlines 'an efficiency of 84%'.
The Series MIHII is Peerless' legacy residential cast-iron hot water boiler, published on the official site under the 'Out of Circulation – Gas Boilers' section. The product page describes an integral draft diverter providing a low-profile design for tight spaces and low ceilings, an efficiency of 84%, and a boiler 'designed specifically for markets where utility companies offer rebates for mid-efficiency heating products'. The page positions the MIHII as 'an adaptation of the high quality Series MI boiler with the same features', equipped with a low-water cutoff for safe operation.
The in-page ratings table covers four fixed-input sizes — MIHII-03 (65 MBH input, 55 MBH heating capacity, 48 MBH net water rating, 84.1% AFUE), MIHII-04 (97.5/82/71, 84.1%), MIHII-05 (130/110/96, 84.0%) and MIHII-06 (162.5/137/119, 84.0%) — with net water ratings based on a piping and pickup allowance of 1.15 and boiler water content of 4.72–8.56 US gallons. The dimensions table matches the MI-03 through MI-06 jacket rows: 26-5/8" depth, 12-1/2"–22-5/8" widths, 31-3/8" height and 5" or 6" vent diameters.
The official site groups the Series MIHII under 'Out of Circulation', so Boilers.ca records productStatus 'discontinued' and documents all four sizes at model level from the product page and the shared MI8038 R19 I&O manual. No official Canadian-sales statement was found — research reviewed US-site data only — so canadianStatus stays 'unknown', and gas, combustion and venting work belongs with a licensed contractor.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Peerless Boilers
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.
Peerless Boilers
The Peerless Series MIHII MIHII-04 is a 97.5 MBH mid-small size of the legacy mid-efficiency cast-iron gas water line: 97.5 MBH fixed input for 82 MBH heating capacity and a 71 MBH net water rating at 84.1% AFUE, with 6 US gallons of boiler water content, a low-water cutoff and natural-draft venting.
Peerless Boilers
The Peerless Series MIHII MIHII-05 is a 130 MBH mid size of the legacy mid-efficiency cast-iron gas water line: 130 MBH fixed input for 110 MBH heating capacity and a 96 MBH net water rating at 84% AFUE, with 7.28 US gallons of boiler water content, a low-water cutoff and natural-draft venting.
Peerless Boilers
The Peerless Series MIHII MIHII-06 is the largest Series MIHII size of the legacy mid-efficiency cast-iron gas water line: 162.5 MBH fixed input for 137 MBH heating capacity and a 119 MBH net water rating at 84% AFUE, with 8.56 US gallons of boiler water content, a low-water cutoff and natural-draft venting.
| Specification | Peerless Series MIHII MIHII-03 | Peerless Series MIHII MIHII-04 | Peerless Series MIHII MIHII-05 | Peerless Series MIHII MIHII-06 |
|---|---|---|---|---|
| input-min | — | — | — | — |
| input-max | — | — | — | — |
| output-max | — | — | — | — |
| Efficiency (AFUE) | 84.1 % | 84.1 % | 84 % | 84 % |
| turndown | — | — | — | — |
| vent-max-3 | — | — | — | — |
| vent-max-2 | — | — | — | — |
| weight | — | — | — | — |
Read the full comparison: Peerless Series MIHII MIHII-03 vs MIHII-04 →
Read the full comparison: Peerless Series MIHII MIHII-04 vs MIHII-05 →
Read the full comparison: Peerless Series MIHII MIHII-05 vs MIHII-06 →
Read the full comparison: Peerless Series MIHII MIHII-03 vs MIHII-05 →
Error codes and alerts
No alerts documented for this series yet.
Manuals
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.
Services for Peerless Boilers boilers
No — the official site groups the Series MIHII under 'Out of Circulation' (verified September 9, 2026), so Boilers.ca records productStatus 'discontinued'. The product page and I&O manual remain published for owners of installed units.
Four fixed-input sizes: MIHII-03 through MIHII-06 at 65, 97.5, 130 and 162.5 MBH input, with 55–137 MBH heating capacities, 48–119 MBH net water ratings and 84.0–84.1% AFUE per the in-page ratings table.
No — the official product page lists the MIHII as Gas-Fired (Natural) only; the natural-or-LP option belongs to the sibling Series MI.
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
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.