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Bosch Thermotechnology · Series
The Buderus G124X II/SP is a discontinued atmospheric cast-iron gas boiler sold in three sizes (18, 25, 32) at 74,000, 103,000 and 132,500 BTU/hr output with 84.2-84.6% AFUE. It is no longer in Bosch's Canadian catalog, but its English and French manuals remain in the Canadian technical-documentation library.
Series facts
The Buderus G124X/G234X/G334X brochure prints AFUE 84.3% (18), 84.2% (25) and 84.6% (32); the installation manual itself prints output, dimensions and weights without an AFUE row.
The G124X II/SP is a cast-iron sectional boiler with a draft hood and an atmospheric gas burner, designed to heat water for single or multiple-occupancy buildings. The installation and maintenance manual lists three sizes: 18 (74 MBtu/hr output, 229 lb dry), 25 (103 MBtu/hr, 240 lb) and 32 (132.5 MBtu/hr, 337 lb), with water contents of 2.4, 2.9 and 3.4 US gallons. The series brochure adds AFUE 84.3%, 84.2% and 84.6% and net IBR ratings of 53,000, 75,000 and 96,000 BTU/hr.
The G124X is not listed in Bosch's current Canadian non-condensing catalog, which carries only the G115WS and G215. Its manuals are still served from the Canadian library - installation and maintenance (English and French), propane conversion kit instructions and high-altitude instructions - and the model appears in the discontinued Buderus documentation library. Boilers.ca treats it as a historical Canadian model with documentation support.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Bosch Thermotechnology
The Buderus G124X/18 is a discontinued atmospheric cast-iron gas boiler rated 74 MBH input with 84.3% AFUE, 53 MBH net IBR rating and a 229 lb dry weight.
Bosch Thermotechnology
The Buderus G124X/25 is a discontinued atmospheric cast-iron gas boiler rated 103 MBH input with 84.2% AFUE, 75 MBH net IBR rating and a 240 lb dry weight.
Bosch Thermotechnology
The Buderus G124X/32 is a discontinued atmospheric cast-iron gas boiler rated 132.5 MBH input with 84.6% AFUE, 96 MBH net IBR rating and a 337 lb dry weight.
| Specification | Buderus G124X/18 | Buderus G124X/25 | Buderus G124X/32 |
|---|---|---|---|
| input-min | — | — | — |
| Input rate | 74 MBH | 103 MBH | 132.5 MBH |
| output-max | — | — | — |
| Efficiency (AFUE) | 84.3 % | 84.2 % | 84.6 % |
| turndown | — | — | — |
| vent-max-3 | — | — | — |
| vent-max-2 | — | — | — |
| weight | — | — | — |
Read the full comparison: Buderus G124X/18 vs G124X/32 →
Read the full comparison: Buderus G124X/18 vs Buderus G124X/25 →
Read the full comparison: Buderus G124X/25 vs Buderus G124X/32 →
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
No. Bosch's current Canadian non-condensing catalog lists only the G115WS and G215. The G124X is absent from the catalog, but its English and French installation manuals, propane conversion and high-altitude instructions are still served from the Canadian technical-documentation library.
Three sizes: G124X/18 at 74,000 BTU/hr, G124X/25 at 103,000 BTU/hr and G124X/32 at 132,500 BTU/hr, per the installation manual and series brochure.
It is an atmospheric, natural-draft boiler with a draft hood, so it vents into a suitable chimney or vent system as detailed in the installation manual; an optional vent damper is also covered there.
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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.