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Bosch Thermotechnology · Series
The Buderus G615 (Logano G615) is a discontinued commercial cast-iron sectional boiler block for oil, gas or combination burners, sold in eight sizes (570 to 1200) with 1,951 to 3,982 MBH gross output. Its manuals are in Bosch's US commercial-discontinued archive.
Series facts
The G615 is the largest Buderus cast-iron sectional block in the discontinued commercial archive, using Thermostream return-water mixing and built for forced-draft oil, gas or combination burners. Eight sizes are documented by boiler capacity - 570, 660, 740, 820, 920, 1020, 1110 and 1200 - with 9 to 16 sections, gross output from 1,951 to 3,982 MBH (570 to 1200 kW), net AHRI ratings of 1,697 to 3,463 MBH, gas input of 2,309 to 4,835 MBH, oil input of 9 to 16 GPH, net weights of 5,523 to 9,143 lb and water contents of 148.25 to 259.25 US gallons.
The G615 is discontinued: its installation/service and operating manuals plus the G315/G515/G615 brochure are published from the US 'Commercial Products - Discontinued' archive. It requires a field-supplied burner and external controls, so the manual set contains no on-board fault-code display. Note: the official technical table's unit labels for the flue-gas mass-flow rows are internally inconsistent (the rows are labelled °F but carry lb/s and kg/s values); Boilers.ca uses only the unambiguous output, input, weight and water rows.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
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 G615/660 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.
Bosch Thermotechnology
The Buderus G615/820 is a discontinued commercial cast-iron boiler block with 12 sections, 2,822 MBH gross output and 2,454 MBH net AHRI rating for oil or gas firing.
Bosch Thermotechnology
The Buderus G615/920 is a discontinued commercial cast-iron boiler block with 13 sections, 3,112 MBH gross output and 2,706 MBH net AHRI rating for oil or gas firing.
Bosch Thermotechnology
The Buderus G615/1020 is a discontinued commercial cast-iron boiler block with 14 sections, 3,402 MBH gross output and 2,958 MBH net AHRI rating for oil or gas firing.
Bosch Thermotechnology
The Buderus G615/1110 is a discontinued commercial cast-iron boiler block with 15 sections, 3,692 MBH gross output and 3,210 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.
| Specification | Buderus G615/570 | Buderus G615/660 | Buderus G615/740 | Buderus G615/820 | Buderus G615/920 | Buderus G615/1020 | Buderus G615/1110 | Buderus G615/1200 |
|---|---|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — | — | — |
| input-max | — | — | — | — | — | — | — | — |
| output-max | — | — | — | — | — | — | — | — |
| afue | — | — | — | — | — | — | — | — |
| turndown | — | — | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — | — | — |
| Weight, net | 5,523 lb | 6,056 lb | 6,592 lb | 7,125 lb | 7,661 lb | 8,179 lb | 8,715 lb | 9,143 lb |
Read the full comparison: Buderus G615/570 vs G615/1200 →
Read the full comparison: Buderus G615/570 vs Buderus G615/660 →
Read the full comparison: Buderus G615/660 vs Buderus G615/740 →
Read the full comparison: Buderus G615/740 vs Buderus G615/820 →
Error codes and alerts
No alerts documented for this series yet.
Manuals
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Services for Bosch Thermotechnology boilers
The G615/1200: 16 boiler sections, 3,982 MBH gross output (1,200 kW), 4,835 MBH gas input, 9,143 lb net weight and 259.25 US gallons of boiler water, per the installation manual technical table.
No. It is a boiler block for forced-draft firing; a field-supplied burner is required, approved burners are listed by Bosch, and controls are external (aquastat, Logamatic 4000 or BMS).
Describe what the boiler is doing and get a straight answer about the next step.
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.