Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Peerless Series GM GM-e-05 and Peerless Series GM GM-07 are two non-condensing boilers from the Peerless Boilers Series GM line. Published ratings: Peerless Series GM GM-e-05 at 214.5 MBH input and 182 MBH heating capacity; Peerless Series GM GM-07 at 342 MBH input and 275 MBH heating capacity. Peerless Series GM GM-07 lists 127.5 MBH more input than Peerless Series GM GM-e-05 (342 MBH against 214.5 MBH).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Peerless Series GM GM-e-05 | Peerless Series GM GM-07 |
|---|---|---|
| Input | 214.5 MBH | 342 MBH |
| Heating capacity | 182 MBH | 275 MBH |
| Net water rating | 158 MBH | 239 MBH |
| 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 |
| Dimensions (A × B × C) | 25-3/4" × 19-1/4" × 35-1/4" | 25-3/4" × 26-1/4" × 35-1/4" |
| Fuel | Natural gas or LP gas | Natural gas or LP gas |
| Vent connector | 7" | 10" |
| Control | Spark pilot ignition | Spark pilot ignition |
Published ratings: the Peerless Series GM GM-e-05 is rated 214.5 MBH input and 182 MBH heating capacity; the Peerless Series GM GM-07 is rated 342 MBH input and 275 MBH heating capacity. Peerless Series GM GM-07 lists 127.5 MBH more input than Peerless Series GM GM-e-05 (342 MBH against 214.5 MBH).
The dimensions differs: the Peerless Series GM GM-e-05 lists 25-3/4" × 19-1/4" × 35-1/4", while the Peerless Series GM GM-07 lists 25-3/4" × 26-1/4" × 35-1/4". The vent connector differs: the Peerless Series GM GM-e-05 lists 7", while the Peerless Series GM GM-07 lists 10".
Both records print the same domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), fuel (Natural gas or LP gas) and control (Spark pilot ignition), per the cited sources.
Peerless Boilers
The Peerless Series GM GM-e-05 is a current semi-commercial cast-iron gas boiler firing 214.5 MBH for 182 MBH heating capacity and a 158 MBH net water rating at 84.2% AFUE, in a natural-draft chimney package sized for single, multiple or modular installations.
Peerless Boilers
The Peerless Series GM GM-07 is a current semi-commercial cast-iron gas boiler firing 342 MBH for 275 MBH gross output and a 239 MBH net water rating at 80.3% thermal efficiency, in a natural-draft chimney package sized for single, multiple or modular installations.
The Peerless Series GM GM-07 lists 342 MBH, against 214.5 MBH on the Peerless Series GM GM-e-05, per the cited documentation.
The Peerless Series GM GM-07 lists 275 MBH, against 182 MBH on the Peerless Series GM GM-e-05.
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.