Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the Buderus G615/660 and the Buderus G615/740 belong to the Bosch Thermotechnology Buderus G615 (Logano G615) line of non-condensing boilers. The Buderus G615/660 is rated 1,950 MBH net rating, and the Buderus G615/740 is rated 2,202 MBH net rating. Buderus G615/740 lists 252 MBH more net rating than Buderus G615/660 (2,202 MBH against 1,950 MBH). Buderus G615/740 lists 536 lb more shipping weight than Buderus G615/660 (6,592 lb against 6,056 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus G615/660 | Buderus G615/740 |
|---|---|---|
| Net AHRI rating, water (gas and oil) | 1,950 MBH | 2,202 MBH |
| Weight, net | 6,056 lb | 6,592 lb |
| Maximum permissible operating pressure | 87 psi | 87 psi |
| Fuels | Heating oil, liquid propane or natural gas | Heating oil, liquid propane or natural gas |
| Number of boiler sections | 10 | 11 |
| Gross output | 2,242 MBH | 2,532 MBH |
| Input rating, gas | 2,670 MBH | 3,031 MBH |
| Input rating, oil | 10 gph | 11 gph |
| Boiler water content | 164 US gal | 180 US gal |
| Maximum permissible supply temperature | 248 °F | 248 °F |
Published ratings: the Buderus G615/660 is rated 1,950 MBH net rating; the Buderus G615/740 is rated 2,202 MBH net rating. Buderus G615/740 lists 252 MBH more net rating than Buderus G615/660 (2,202 MBH against 1,950 MBH).
Buderus G615/740 lists 536 lb more shipping weight than Buderus G615/660 (6,592 lb against 6,056 lb). The number of boiler sections differs: the Buderus G615/660 lists 10, while the Buderus G615/740 lists 11. The boiler water content differs: the Buderus G615/660 lists 164 US gal, while the Buderus G615/740 lists 180 US gal.
Both records print the same maximum operating pressure (87 psi), fuel (Heating oil, liquid propane or natural gas) and maximum permissible supply temperature (248 °F), per the cited sources.
Bosch Thermotechnology
The Buderus G615/660 is a discontinued commercial cast-iron boiler block with 10 sections, 2,242 MBH gross output and 1,950 MBH net AHRI rating for oil or gas firing.
Bosch Thermotechnology
The Buderus G615/740 is a discontinued commercial cast-iron boiler block with 11 sections, 2,532 MBH gross output and 2,202 MBH net AHRI rating for oil or gas firing.
The Buderus G615/740 lists 2,202 MBH, against 1,950 MBH on the Buderus G615/660, per the cited documentation.
The Buderus G615/740 lists 2,202 MBH, against 1,950 MBH on the Buderus G615/660.
It ships at 6,592 lb against 6,056 lb for the Buderus G615/660, 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.