Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Peerless Series TCII TCII-04 and Peerless Series TCII TCII-05 are both non-condensing boilers in the Peerless Boilers Series TCII line. Published ratings: Peerless Series TCII TCII-04 at 1,143 MBH gas input, 810 MBH net water rating and 81.4% gas thermal efficiency; Peerless Series TCII TCII-05 at 1,458 MBH gas input, 1,038 MBH net water rating and 81.9% gas thermal efficiency. Peerless Series TCII TCII-05 lists 315 MBH more gas input than Peerless Series TCII TCII-04 (1,458 MBH against 1,143 MBH). Peerless Series TCII TCII-05 carries the higher published gas thermal efficiency at 81.9%, against 81.4%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Peerless Series TCII TCII-04 | Peerless Series TCII TCII-05 |
|---|---|---|
| Net water rating | 810 MBH | 1,038 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 |
| 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 | 1,143 MBH | 1,458 MBH |
| Oil input | 7.9 GPH | 10.2 GPH |
| Gross output | 931 MBH | 1,194 MBH |
| Net steam rating | 698 MBH | 896 MBH |
| Gas thermal efficiency | 81.4 % | 81.9 % |
| Oil thermal efficiency | 83.9 % | 84.4 % |
| Construction | Cast iron with flexible graphite port connectors and individual draw rods | Cast iron with flexible graphite port connectors and individual draw rods |
Published ratings: the Peerless Series TCII TCII-04 is rated 1,143 MBH gas input, 810 MBH net water rating and 81.4% gas thermal efficiency; the Peerless Series TCII TCII-05 is rated 1,458 MBH gas input, 1,038 MBH net water rating and 81.9% gas thermal efficiency. Peerless Series TCII TCII-05 lists 315 MBH more gas input than Peerless Series TCII TCII-04 (1,458 MBH against 1,143 MBH). Peerless Series TCII TCII-05 carries the higher published gas thermal efficiency at 81.9%, against 81.4%.
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), fuel (Natural gas or oil (combination gas/oil configurations)) and construction (Cast iron with flexible graphite port connectors and individual draw rods), per the cited sources.
Peerless Boilers
The Peerless Series TCII TCII-04 is a current commercial cast-iron steam or hot water boiler firing 1143 MBH gas (7.9 GPH oil) for 931 MBH gross output, a 698 MBH net steam rating (2908 sq ft) and a 810 MBH net water rating at 81.4% gas thermal efficiency on a forced-draft power burner.
Peerless Boilers
The Peerless Series TCII TCII-05 is a current commercial cast-iron steam or hot water boiler firing 1458 MBH gas (10.2 GPH oil) for 1194 MBH gross output, a 896 MBH net steam rating (3733 sq ft) and a 1038 MBH net water rating at 81.9% gas thermal efficiency on a forced-draft power burner.
The Peerless Series TCII TCII-05 lists 1,458 MBH, against 1,143 MBH on the Peerless Series TCII TCII-04, per the cited documentation.
The Peerless Series TCII TCII-05 carries the higher published gas thermal efficiency at 81.9%, against 81.4%.
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.