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Bosch Thermotechnology · Series
The Buderus GB142 was the Logamax plus GB142 condensing boiler sold in Canada in four kW sizes (GB142-24/30/45/60 kW) with UBA 3 controls. It is absent from both the CA and US catalogs and its manuals now sit in the US 'Discontinued Buderus Products' library, while Bosch's Canadian FAQ pages still answer GB142 owners' questions about 3L and 6A fault codes.
Series facts
The GB142 was the Buderus wall-hung condensing boiler of the Logamax plus family, sold in four sizes — GB142-24, GB142-30, GB142-45 and GB142-60 kW — with natural-gas inputs from 25,700 to 214,800 BTU/hr across the range and CSA outputs of 76,300 to 178,900 BTU/hr. Its installation manual (6720820104, 10.2017 US/CA) and service instructions (7214 9400, US/CA) are still published, but only from the US site's 'Discontinued Buderus Products' documentation library; the Canadian manual library does not serve GB142 manuals.
Discontinuation is evidenced rather than announced: the GB142 appears in neither the Canadian nor the US condensing catalog, its documents are filed under 'Discontinued Buderus Products', and no current official page carries the sentence 'GB142 is discontinued'. Canadian support still exists in content form: Bosch's CA 'Condensing Gas Boilers FAQ' includes a GB142 section that answers whether regular maintenance is needed, walks owners through the '3L' and '6A' fault codes against the service manual, points to a heat-exchanger parts diagram, and notes the two fuses in the boiler, one in the UBA 3.
The GB142 control is the UBA 3 with a BC10 basic controller. Faults show as two-character service codes — the service manual's chapter 7 Diagnosis covers codes such as 2F, 2L, 3A, 3L, 4A, 4C, 6A, 6C, 6L, 7L, 8Y, 9L and H7 — paired with numeric sub-codes in the 207-306 range and system-fault letters, with a structural diagram per code. Bosch's CA FAQ confirms the '6A' example: no ionization after four startup attempts.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
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.
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.
| Specification | Buderus GB142-24 kW | Buderus GB142-30 kW | Buderus GB142-45 kW | Buderus GB142-60 kW |
|---|---|---|---|---|
| Rated thermal load, minimum (NG) | 26 MBH | 32 MBH | 46 MBH | 66 MBH |
| Rated thermal load, maximum (NG) | 85 MBH | 106 MBH | 161 MBH | 215 MBH |
| output-max | — | — | — | — |
| afue | — | — | — | — |
| turndown | — | — | — | — |
| vent-max-3 | — | — | — | — |
| vent-max-2 | — | — | — | — |
| Weight (without packaging) | 110 lb | 110 lb | 143 lb | 158 lb |
Read the full comparison: Buderus GB142-24 kW vs GB142-30 kW →
Read the full comparison: Buderus GB142-30 kW vs GB142-45 kW →
Read the full comparison: Buderus GB142-45 kW vs GB142-60 kW →
Read the full comparison: Buderus GB142-24 kW vs Buderus GB142-45 kW →
Error codes and alerts
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 current catalog carries it: the GB142 is absent from both the Canadian and US condensing-boiler catalogs and its manuals are filed under the US 'Discontinued Buderus Products' library. Owners and service techs still get content support from the CA FAQ, but new units are not listed for sale.
Bosch's Canadian FAQ answers both: a '3L' code typically points to the fan, the UBA 3 or the connections between them, and '6A' means no ionization after four startup attempts. The detailed troubleshooting steps are in chapter 7 of the GB142 Service Instructions (7214 9400).
Support is legacy-content based: the CA FAQ answers GB142 maintenance and fault-code questions and the US discontinued-products library hosts the installation, service and user manuals. There is no current-catalog or parts-page status for the model on the CA site.
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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 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.