Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Peerless Series CC CC-04 and Peerless Series CC CC-05 are both non-condensing boilers in the Peerless Boilers Series CC line. The Peerless Series CC CC-04 is rated 520 MBH gas input, 366 MBH net water rating and 81.5% gas thermal efficiency, and the Peerless Series CC CC-05 is rated 722 MBH gas input, 540 MBH net water rating and 81.3% gas thermal efficiency. Peerless Series CC CC-05 lists 202 MBH more gas input than Peerless Series CC CC-04 (722 MBH against 520 MBH). Peerless Series CC CC-04 carries the higher published gas thermal efficiency at 81.5%, against 81.3%. Peerless Series CC CC-05 lists 406 lb more shipping weight than Peerless Series CC CC-04 (2,528 lb against 2,122 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Peerless Series CC CC-04 | Peerless Series CC CC-05 |
|---|---|---|
| Net water rating | 366 MBH | 540 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 |
| Water content | 41 gal | 49 gal |
| Boiler working weight | 2,122 lb | 2,528 lb |
| Venting | Forced draft with a power burner | Forced draft with a power burner |
| Fuel | Natural gas or oil (combination gas/oil configurations) | Natural gas or oil (combination gas/oil configurations) |
| Gas input | 520 MBH | 722 MBH |
| Oil input | 3.6 GPH | 5 GPH |
| Gross output | 421 MBH | 587 MBH |
| Net steam rating | 316 MBH | 441 MBH |
| Gas thermal efficiency | 81.5 % | 81.3 % |
| Oil thermal efficiency | 84.1 % | 83.9 % |
| Boiler horsepower | 12.5 | 17.5 |
| Heating surface | 35.8 sq ft | 47.7 sq ft |
Published ratings: the Peerless Series CC CC-04 is rated 520 MBH gas input, 366 MBH net water rating and 81.5% gas thermal efficiency; the Peerless Series CC CC-05 is rated 722 MBH gas input, 540 MBH net water rating and 81.3% gas thermal efficiency. Peerless Series CC CC-05 lists 202 MBH more gas input than Peerless Series CC CC-04 (722 MBH against 520 MBH). Peerless Series CC CC-04 carries the higher published gas thermal efficiency at 81.5%, against 81.3%.
Peerless Series CC CC-05 lists 406 lb more shipping weight than Peerless Series CC CC-04 (2,528 lb against 2,122 lb). The boiler water content differs: the Peerless Series CC CC-04 lists 41 gal, while the Peerless Series CC CC-05 lists 49 gal. The boiler horsepower differs: the Peerless Series CC CC-04 lists 12.5, while the Peerless Series CC CC-05 lists 17.5. The heating surface differs: the Peerless Series CC CC-04 lists 35.8 sq ft, while the Peerless Series CC CC-05 lists 47.7 sq ft.
Both records print the same domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), venting (Forced draft with a power burner) and fuel (Natural gas or oil (combination gas/oil configurations)), per the cited sources.
Peerless Boilers
The Peerless Series CC CC-04 is a current commercial cast-iron steam or hot water boiler firing 520 MBH gas (3.6 GPH oil) for 421 MBH gross output, a 316 MBH net steam rating (1316 sq ft) and a 366 MBH net water rating at 81.5% gas thermal efficiency on a forced-draft power burner.
Peerless Boilers
The Peerless Series CC CC-05 is a current commercial cast-iron steam or hot water boiler firing 722 MBH gas (5 GPH oil) for 587 MBH gross output, a 441 MBH net steam rating (1725 sq ft) and a 540 MBH net water rating at 81.3% gas thermal efficiency on a forced-draft power burner.
The Peerless Series CC CC-05 lists 722 MBH, against 520 MBH on the Peerless Series CC CC-04, per the cited documentation.
The Peerless Series CC CC-04 carries the higher published gas thermal efficiency at 81.5%, against 81.3%.
It ships at 2,528 lb against 2,122 lb for the Peerless Series CC CC-04, per the cited sources.
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.