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 GB142-60 kW was the top of the discontinued GB142 line and the same physical family as the 45 kW — the 28 x 35.4 x 18.7 in cabinet at 58 psi — but grew to 158 lb and fired 66,000 to 214,800 BTU/hr with 178,900 BTU/hr CSA output, against the 45 kW's 46,000 to 160,900 BTU/hr and 144,800 BTU/hr CSA output.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus GB142-45 kW | Buderus GB142-60 kW |
|---|---|---|
| Rated thermal load, minimum (NG) | 46 MBH | 66 MBH |
| Rated thermal load, maximum (NG) | 161 MBH | 215 MBH |
| CSA output | 145 MBH | 179 MBH |
| Weight (without packaging) | 143 lb | 158 lb |
| Maximum flow temperature | 194 °F | 194 °F |
| Maximum operating overpressure of boiler | 58 psi | 58 psi |
| Heat exchanger heating circuit volume | 1 gal | 1.3 gal |
| Electrical power consumption, full load | 64 W | 82 W |
Both sizes used the longer GB142 cabinet — 28 x 35.4 x 18.7 in (712 x 900 x 475 mm) — with the 58 psi (4 bar) maximum overpressure rating and 194 °F maximum flow temperature. The 60 kW unit was 15 lb heavier at 158 lb and carried a 1.3 gal heat-exchanger volume against the 45 kW's 1.0 gal.
Firing ranges from the IOM technical specifications: the 60 kW ran 66,000 to 214,800 BTU/hr natural-gas input with 178,900 BTU/hr CSA output, against the 45 kW's 46,000 to 160,900 BTU/hr and 144,800 BTU/hr. Full-load draw was 82 W against 64 W.
Both are historical records of the discontinued GB142 line. The GB142 remains absent from both catalogs, its manuals sit in the US 'Discontinued Buderus Products' library, and Canadian owners still have the CA FAQ's GB142 maintenance and 3L/6A guidance to work from.
Bosch Thermotechnology
The Buderus GB142-45 kW was one of four GB142 condensing boiler sizes sold in Canada (24/30/45/60 kW). This size fired 46 to 160.9 MBH natural-gas input with 145 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 GB142-60 kW was one of four GB142 condensing boiler sizes sold in Canada (24/30/45/60 kW). This size fired 66 to 214.8 MBH natural-gas input with 179 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.
They shared the cabinet footprint and 58 psi rating; the 60 kW was 15 lb heavier, held more water in the heat exchanger (1.3 versus 1.0 gal) and needed more input and electrical capacity.
214,800 BTU/hr natural-gas input and 178,900 BTU/hr CSA output on the GB142-60 kW, per the IOM technical specifications.
No — the whole GB142 family is absent from the CA and US catalogs; these records exist for owners of installed units.
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.