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
Comparison
Verdict in brief
The discontinued G124X/18 and G124X/32 are atmospheric cast-iron gas boilers with draft hoods and 1" supply/return. The /18 fires 74,000 BTU/hr for 61,400 BTU/hr DOE capacity and 53,000 net IBR at 84.3% AFUE; the /32 fires 132,500 BTU/hr for 110,000 DOE and 96,000 net at 84.6%, with a 6" instead of 5" vent and a 337 lb instead of 229 lb dry weight.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus G124X/18 | Buderus G124X/32 |
|---|---|---|
| Input rate | 74 MBH | 132.5 MBH |
| DOE heating capacity | 61.4 MBH | 110 MBH |
| Net IBR rating | 53 MBH | 96 MBH |
| Efficiency (AFUE) | 84.3 % | 84.6 % |
| Dry weight | 229 lb | 337 lb |
| Water content | 2.4 US gal | 3.4 US gal |
| Vent connection (B-Vent II) | 5" | 6" |
Both sizes are documented in the G124X II/SP installation and maintenance manual and the G124X/G234X/G334X brochure. They share the atmospheric cast-iron design with a draft hood, 1" boiler supply and return, 1/2" gas connection, and the option of a vent damper.
The rating rows scale: 74,000 BTU/hr input, 61,400 DOE heating capacity and 53,000 net IBR on the /18 against 132,500 BTU/hr, 110,000 and 96,000 on the /32. AFUE is 84.3% and 84.6% respectively; the /25 between them prints 84.2%.
Physical differences: 229 lb dry / 2.4 gal water / 5" vent on the /18; 337 lb / 3.4 gal / 6" vent on the /32. Both are absent from Bosch's current Canadian catalog but their manuals remain in the Canadian technical-documentation library, including propane conversion and high-altitude instructions.
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/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.
The /32 is slightly higher at 84.6% AFUE against 84.3% on the /18 and 84.2% on the /25, per the series brochure.
No - the /18 and /25 use a 5" flue connection and the /32 a 6" connection.
Yes - Bosch's Canadian technical-documentation library still serves the G124X installation and maintenance manuals (English and French), propane conversion kit instructions and high-altitude instructions.
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.