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 GB142-24 kW and GB142-30 kW were the two smallest discontinued Buderus GB142 sizes and shared the entire 28 x 22 x 18.7 in, 110 lb cabinet at 43.5 psi. The 30 kW fired 31,800 to 106,000 BTU/hr against the 24 kW's 25,700 to 84,800 BTU/hr, with CSA output rising from 76,300 to 95,400 BTU/hr and full-load draw from 96 to 117 W.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus GB142-24 kW | Buderus GB142-30 kW |
|---|---|---|
| Rated thermal load, minimum (NG) | 26 MBH | 32 MBH |
| Rated thermal load, maximum (NG) | 85 MBH | 106 MBH |
| CSA output | 76 MBH | 95 MBH |
| Weight (without packaging) | 110 lb | 110 lb |
| Maximum flow temperature | 194 °F | 194 °F |
| Maximum operating overpressure of boiler | 43.5 psi | 43.5 psi |
| Heat exchanger heating circuit volume | 0.7 gal | 0.7 gal |
| Electrical power consumption, full load | 96 W | 117 W |
Both sizes occupied the smaller GB142 cabinet — 28 x 22 x 18.7 in (712 x 560 x 475 mm) at 110 lb — with the same 43.5 psi (3 bar) maximum overpressure, 194 °F maximum flow temperature, 3/4" NPT gas connection and 1" NPT water connections. The technical specifications in the 10.2017 IOM are the source for all figures.
The 30 kW fired higher across the board: 31,800 to 106,000 BTU/hr natural-gas input and 95,400 BTU/hr CSA output against the 24 kW's 25,700 to 84,800 BTU/hr and 76,300 BTU/hr CSA output. Full-load electrical consumption steps from 96 to 117 W.
Both are historical models: no GB142 size remains in the CA or US condensing catalog, and this comparison exists to help owners and technicians understand the installed unit. GB142 support content on Bosch's CA FAQ still covers the 3L and 6A fault codes against the 7214 9400 service instructions.
Bosch Thermotechnology
The Buderus GB142-24 kW was one of four GB142 condensing boiler sizes sold in Canada (24/30/45/60 kW). This size fired 25.7 to 84.8 MBH natural-gas input with 76 MBH CSA output; the model is now out of both the CA and US catalogs and is kept as a historical record with its manuals under the US discontinued-Buderus documentation library.
Bosch Thermotechnology
The Buderus GB142-30 kW was one of four GB142 condensing boiler sizes sold in Canada (24/30/45/60 kW). This size fired 31.8 to 106 MBH natural-gas input with 95 MBH CSA output; the model is now out of both the CA and US catalogs and is kept as a historical record with its manuals under the US discontinued-Buderus documentation library.
No sales data is published in the official materials; both sizes share the same cabinet, so the choice was driven by the heat-loss calculation against each size's CSA output.
Support is legacy-content based: manuals live under the US 'Discontinued Buderus Products' library and the CA FAQ still answers GB142 maintenance and fault-code questions. Bosch Thermotechnology Corp. handles parts and warranty queries.
Yes — 3/4" NPT gas and 1" NPT heating-system water connections on both, per the IOM technical specifications.
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 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.