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
The Buderus G334X/73 and Buderus G334X/92 are both non-condensing boilers in the Bosch Thermotechnology Buderus G334X (Logano G334X) line. The Buderus G334X/73 is rated 217 MBH net rating and 82.7% combustion efficiency, and the Buderus G334X/92 is rated 273 MBH net rating and 83.1% combustion efficiency. Buderus G334X/92 lists 56 MBH more net rating than Buderus G334X/73 (273 MBH against 217 MBH). Buderus G334X/92 carries the higher published combustion efficiency at 83.1%, against 82.7%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus G334X/73 | Buderus G334X/92 |
|---|---|---|
| Net IBR rating | 217 MBH | 273 MBH |
| Combustion efficiency | 82.7 % | 83.1 % |
| Fuel | Natural gas or propane | Natural gas or propane |
| Ignition heat load | 301 MBTU/hr | 378 MBTU/hr |
| Nominal output | 249 MBTU/hr | 314 MBTU/hr |
| Number of burner rods | 5 | 6 |
| Dry weight | 758 lb | 930 lb |
| Water volume | 9.2 US gal | 11.4 US gal |
| Vent size | 8" | 9" |
| Gas connection | 3/4" | 3/4" |
Published ratings: the Buderus G334X/73 is rated 217 MBH net rating and 82.7% combustion efficiency; the Buderus G334X/92 is rated 273 MBH net rating and 83.1% combustion efficiency. Buderus G334X/92 lists 56 MBH more net rating than Buderus G334X/73 (273 MBH against 217 MBH). Buderus G334X/92 carries the higher published combustion efficiency at 83.1%, against 82.7%.
The number of burner rods differs: the Buderus G334X/73 lists 5, while the Buderus G334X/92 lists 6. The dry weight differs: the Buderus G334X/73 lists 758 lb, while the Buderus G334X/92 lists 930 lb. The water volume differs: the Buderus G334X/73 lists 9.2 US gal, while the Buderus G334X/92 lists 11.4 US gal.
Both records print the same fuel (Natural gas or propane) and gas connection (3/4"), per the cited sources.
Bosch Thermotechnology
The Buderus G334X/73 is a discontinued atmospheric cast-iron gas boiler with a 301 MBTU/hr ignition heat load, 249 MBTU/hr nominal output and 82.7% combustion efficiency.
Bosch Thermotechnology
The Buderus G334X/92 is a discontinued atmospheric cast-iron gas boiler with a 378 MBTU/hr ignition heat load, 314 MBTU/hr nominal output and 83.1% combustion efficiency.
The Buderus G334X/92 lists 273 MBH, against 217 MBH on the Buderus G334X/73, per the cited documentation.
The Buderus G334X/92 carries the higher published combustion efficiency at 83.1%, against 82.7%.
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.