Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
Peerless Series MI-e MI-e-03 and Peerless Series MI-e MI-e-04 are two non-condensing boilers from the Peerless Boilers Series MI-e line. The Peerless Series MI-e MI-e-03 is documented at 70 MBH input, 60 MBH heating capacity and 84.6% AFUE, while the Peerless Series MI-e MI-e-04 is documented at 105 MBH input, 89 MBH heating capacity and 84.6% AFUE. Peerless Series MI-e MI-e-04 lists 35 MBH more input than Peerless Series MI-e MI-e-03 (105 MBH against 70 MBH). Both list the same published AFUE of 84.6%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Peerless Series MI-e MI-e-03 | Peerless Series MI-e MI-e-04 |
|---|---|---|
| Input | 70 MBH | 105 MBH |
| Heating capacity | 60 MBH | 89 MBH |
| Net water rating | 52 MBH | 77 MBH |
| Efficiency (AFUE) | 84.6 % | 84.6 % |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
| Boiler water content | 4.72 gal | 6 gal |
| Venting | Natural draft into an approved chimney | Natural draft into an approved chimney |
| Control | Hydrostat IC Integrated Boiler Control | Hydrostat IC Integrated Boiler Control |
| Fuel | Natural gas or LP gas | Natural gas or LP gas |
Published ratings: the Peerless Series MI-e MI-e-03 is rated 70 MBH input, 60 MBH heating capacity and 84.6% AFUE; the Peerless Series MI-e MI-e-04 is rated 105 MBH input, 89 MBH heating capacity and 84.6% AFUE. Peerless Series MI-e MI-e-04 lists 35 MBH more input than Peerless Series MI-e MI-e-03 (105 MBH against 70 MBH). Both list the same published AFUE of 84.6%.
The boiler water content differs: the Peerless Series MI-e MI-e-03 lists 4.72 gal, while the Peerless Series MI-e MI-e-04 lists 6 gal.
Both records print the same AFUE (84.6%), domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), venting (Natural draft into an approved chimney) and control (Hydrostat IC Integrated Boiler Control), per the cited sources.
Peerless Boilers
The Peerless Series MI-e MI-e-03 is the smallest size of the 84%-class cast-iron gas water line: a fixed 70 MBH input for 60 MBH heating capacity and a 52 MBH net water rating at 84.6% AFUE, with 4.72 US gallons of boiler water content, on the Hydrostat IC natural-draft platform.
Peerless Boilers
The Peerless Series MI-e MI-e-04 is a 105 MBH mid-small size of the 84%-class cast-iron gas water line: a fixed 105 MBH input for 89 MBH heating capacity and a 77 MBH net water rating at 84.6% AFUE, with 6 US gallons of boiler water content, on the Hydrostat IC natural-draft platform.
The Peerless Series MI-e MI-e-04 lists 105 MBH, against 70 MBH on the Peerless Series MI-e MI-e-03, per the cited documentation.
Both list the same AFUE of 84.6%.
A consultation includes a heat-loss review so the size is right the first time.
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.