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Bosch Thermotechnology · Series
The Buderus G315 (Logano G315) is a discontinued commercial sectional cast-iron boiler block for forced-draft oil, natural-gas or propane burners, sold in five sizes (G315/5 to G315/9) with 433 to 924 MBtu/h gas input and 304 to 668 MBtu/h IBR ratings. It is documented in Bosch's US commercial-discontinued archive.
Series facts
The G315 is a three-pass sectional cast-iron hot water boiler with GL-180M high-silicon cast iron and Buderus Thermostream return-water mixing. Its engineering submittal sheets rate five sizes by section count: G315/5 through G315/9 at 433, 556, 678, 801 and 924 MBtu/h gas input, 3.00 to 6.40 GPH oil input, 350 to 768 MBtu/h rated gross output and 304 to 668 MBtu/h IBR ratings, with 84.2-84.5% AHRI natural-gas combustion efficiency and 86.8-87.1% oil combustion efficiency. All sizes are 87 psig MAWP with 3" supply and return connections.
The G315 is no longer sold: it appears in the US 'Commercial Products - Discontinued' boiler archive with installation/service instructions, per-size engineering submittal sheets and the G315/G515/G615 brochure. It requires a field-supplied burner - the boiler is a block, not a complete appliance - so Boilers.ca records the block ratings and notes that approved-burner selection is by Bosch. The G315 family's controls are external (aquastat, Logamatic 4000 or BMS), so there is no on-board fault-code table.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Bosch Thermotechnology
The Buderus G315/5 is a discontinued commercial cast-iron boiler block with 5 sections, 433 MBtu/h gas input (3 GPH oil) and a 304 MBtu/h IBR rating.
Bosch Thermotechnology
The Buderus G315/6 is a discontinued commercial cast-iron boiler block with 6 sections, 556 MBtu/h gas input (3.85 GPH oil) and a 395 MBtu/h IBR rating.
Bosch Thermotechnology
The Buderus G315/7 is a discontinued commercial cast-iron boiler block with 7 sections, 678 MBtu/h gas input (4.7 GPH oil) and a 486 MBtu/h IBR rating.
Bosch Thermotechnology
The Buderus G315/8 is a discontinued commercial cast-iron boiler block with 8 sections, 801 MBtu/h gas input (5.6 GPH oil) and a 577 MBtu/h IBR rating.
Bosch Thermotechnology
The Buderus G315/9 is a discontinued commercial cast-iron boiler block with 9 sections, 924 MBtu/h gas input (6.4 GPH oil) and a 668 MBtu/h IBR rating.
| Specification | Buderus G315/5 | Buderus G315/6 | Buderus G315/7 | Buderus G315/8 | Buderus G315/9 |
|---|---|---|---|---|---|
| input-min | — | — | — | — | — |
| input-max | — | — | — | — | — |
| output-max | — | — | — | — | — |
| afue | — | — | — | — | — |
| turndown | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — |
| weight | — | — | — | — | — |
Read the full comparison: Buderus G315/5 vs G315/9 →
Read the full comparison: Buderus G315/5 vs Buderus G315/6 →
Read the full comparison: Buderus G315/6 vs Buderus G315/7 →
Read the full comparison: Buderus G315/7 vs Buderus G315/8 →
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
It is a boiler block for forced-draft firing: the engineering submittal sheet lists allowable fuels (natural gas, LP, oil #2) and notes that motor voltages, gas/oil pressures and modes of operation vary with the final burner selection. A field-supplied burner is required, and approved burners are listed by Bosch.
Five section counts: G315/5 through G315/9, with 433, 556, 678, 801 and 924 MBtu/h gas input and 304, 395, 486, 577 and 668 MBtu/h IBR ratings.
No. The G315 is a boiler block controlled by an external aquastat, Logamatic 4000 or BMS; it has no on-board display or fault-code table in the manual set.
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.