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
Bosch Thermotechnology · Series
The Buderus G515 (Logano G515) is a discontinued commercial cast-iron sectional boiler block for oil, gas or combination burners, sold in six sizes (240 to 510) with 685.8 to 1,740.2 MBH nominal output. Its manuals are in Bosch's US commercial-discontinued archive.
Series facts
The G515 is a Buderus cast-iron sectional boiler with Thermostream return-water mixing, built for forced-draft oil, gas or combination burners. The technical data table lists six sizes by boiler capacity - 240, 295, 350, 400, 455 and 510 - with 7 to 12 sections, nominal output from 685.8-818.9 MBH (240) up to 1,555.9-1,740.2 MBH (510), combustion output from 735.7-886.1 to 1,665.8-1,869.2 MBH, net weights of 2,800 to 4,542 lb and water contents of 68.2 to 115.7 US gallons. Maximum permissible supply temperature is 248 °F and maximum operating pressure 87 psi.
The G515 is discontinued: its installation/service and operating manuals and the G315/G515/G615 brochure are published from the US 'Commercial Products - Discontinued' archive. As a boiler block it needs a field-supplied burner and external controls (aquastat, Logamatic 4000 or BMS), so no on-board fault-code table exists in the manual set.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Bosch Thermotechnology
The Buderus G515/240 is a discontinued commercial cast-iron boiler block with 7 sections and a nominal output range of 685.8-818.9 MBH for oil, gas or combination burners.
Bosch Thermotechnology
The Buderus G515/295 is a discontinued commercial cast-iron boiler block with 8 sections and a nominal output range of 822.3-1,006.6 MBH for oil, gas or combination burners.
Bosch Thermotechnology
The Buderus G515/350 is a discontinued commercial cast-iron boiler block with 9 sections and a nominal output range of 1,010-1,194.2 MBH for oil, gas or combination burners.
Bosch Thermotechnology
The Buderus G515/400 is a discontinued commercial cast-iron boiler block with 10 sections and a nominal output range of 1,197.7-1,364.9 MBH for oil, gas or combination burners.
Bosch Thermotechnology
The Buderus G515/455 is a discontinued commercial cast-iron boiler block with 11 sections and a nominal output range of 1,368.3-1,552.5 MBH for oil, gas or combination burners.
Bosch Thermotechnology
The Buderus G515/510 is a discontinued commercial cast-iron boiler block with 12 sections and a nominal output range of 1,555.9-1,740.2 MBH for oil, gas or combination burners.
| Specification | Buderus G515/240 | Buderus G515/295 | Buderus G515/350 | Buderus G515/400 | Buderus G515/455 | Buderus G515/510 |
|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — |
| input-max | — | — | — | — | — | — |
| Nominal output, upper value | 818.9 MBH | 1,006.6 MBH | 1,194.2 MBH | 1,364.9 MBH | 1,552.5 MBH | 1,740.2 MBH |
| afue | — | — | — | — | — | — |
| turndown | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — |
| Weight, net | 2,800 lb | 3,153 lb | 3,506 lb | 3,865 lb | 4,189 lb | 4,542 lb |
Read the full comparison: Buderus G515/240 vs G515/510 →
Read the full comparison: Buderus G515/240 vs Buderus G515/295 →
Read the full comparison: Buderus G515/295 vs Buderus G515/350 →
Read the full comparison: Buderus G515/350 vs Buderus G515/400 →
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 G515/510: 12 boiler sections, 1,555.9-1,740.2 MBH nominal output, 4,542 lb net weight and 115.7 US gallons of boiler water, per the installation manual technical data table.
No. It is a boiler block; the manual states it can be operated with oil, gas and combination burners and directs you to Bosch for the list of approved burners. The burner and controls are selected separately.
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.