Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The discontinued G615/570 and G615/1200 are the largest Buderus cast-iron boiler blocks in the archived commercial line, fired by field-supplied oil, gas or combination burners. The /570 uses 9 sections with 1,951 MBH gross output, 2,309 MBH gas input and 5,523 lb net weight; the /1200 uses 16 sections with 3,982 MBH gross, 4,835 MBH gas input and 9,143 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus G615/570 | Buderus G615/1200 |
|---|---|---|
| Number of boiler sections | 9 | 16 |
| Gross output | 1,951 MBH | 3,982 MBH |
| Net AHRI rating, water (gas and oil) | 1,697 MBH | 3,463 MBH |
| Input rating, gas | 2,309 MBH | 4,835 MBH |
| Input rating, oil | 9 gph | 16 gph |
| Weight, net | 5,523 lb | 9,143 lb |
| Boiler water content | 148.25 US gal | 259.25 US gal |
Both sizes share the Logano G615 design: Buderus cast-iron sections with Thermostream return-water mixing, 248 °F maximum permissible supply temperature, 87 psi maximum operating pressure and forced-draft burner mounting. The technical table's gross-output values are printed in kW and MBH-equivalent numbers (570 to 1200).
Ratings scale: gross output 1,951 to 3,982 MBH, net AHRI water ratings 1,697 to 3,463 MBH, gas input 2,309 to 4,835 MBH and oil input 9 to 16 GPH across the eight sizes. Sections run 9 to 16.
Physical rows: net weight 5,523 to 9,143 lb and boiler water content 148.25 to 259.25 US gal. The G615 is discontinued with installation/service and operating manuals in Bosch's US commercial-discontinued archive. Note the official table's flue-gas mass-flow rows are mislabeled °F while carrying lb/s values; Boilers.ca uses only the unambiguous rows.
Bosch Thermotechnology
The Buderus G615/570 is a discontinued commercial cast-iron boiler block with 9 sections, 1,951 MBH gross output and 1,697 MBH net AHRI rating for oil or gas firing.
Bosch Thermotechnology
The Buderus G615/1200 is a discontinued commercial cast-iron boiler block with 16 sections, 3,982 MBH gross output and 3,463 MBH net AHRI rating for oil or gas firing.
The G615/1200 with 16 sections, 3,982 MBH gross output, 4,835 MBH gas input and 9,143 lb net weight.
No - they are boiler blocks with external controls (aquastat, Logamatic 4000 or BMS) and a field-supplied burner from Bosch's approved list.
The official technical table labels its flue-gas mass-flow rows with °F while the values are in lb/s and kg/s. Boilers.ca treats those rows as unusable and records only the output, input, weight and water rows.
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.