Bosch Thermotechnology · Buderus GB162
Buderus GB162-100 kW
The Buderus GB162-100 kW is the largest North American GB162: 72,000 to 333,000 BTU/hr natural-gas input and 295,000 BTU/hr CSA output, with BTS 2000 efficiency figures (96.1 part load) in place of an AFUE row, in the same 154 lb wall cabinet as the 80 kW.
Key figures
- Max input
- 333 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 72 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Buderus GB162-100 kW in practice
The GB162-100 kW is the top of the two-model North American GB162 range and the size a cascade plant is usually built from: natural-gas input runs 72,000 to 333,000 BTU/hr (62,000 to 315,000 on propane) with a 295,000 BTU/hr CSA output. Bosch's CA product page describes cascades linking typically two to four boilers, expandable to eight, and claims a four-boiler cascade delivering over 1,000 MBH can fit in less than 13 square feet of floor space.
Efficiency documentation differs from the 80 kW: the service-manual appendix prints no AFUE row for the 100 kW and instead lists BTS 2000 figures of 96.1 (part load) and 90.8 (full load) at 80/180 °F, alongside the family-level 'up to 93% AFUE' claim on the CA product page. Physical data matches the 80 kW: 50.4 x 20.5 x 18.3 in cabinet, 154 lb (70 kg) without the pump group, 4" flue connection (4"/4" parallel for room-air-independent runs).
The 100 kW runs the same UBA 3/BC10 control package as the 80 kW with its two-character-plus-sub-code fault display and LED state column. Like its sibling it is still a current CA catalog product while the US catalog lists the GB162 as discontinued — a cross-border status difference buyers should confirm with Bosch Thermotechnology Corp.
Best suited to
- Large residences and light-commercial plants at the top of the GB162 range
- Cascade designs needing the 100 kW unit as the building block
- Installations where the same 154 lb wall cabinet must deliver up to 333 MBH input
Applicability and support
- Model number
- GB162-100 kW
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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.
Specifications
Published specifications
Values as published by Bosch Thermotechnology. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Rated thermal load, minimum (NG) | 72 MBH | 72,000 BTU/hr natural gas; 62,000 BTU/hr propane. |
| Rated thermal load, maximum (NG) | 333 MBH | 333,000 BTU/hr natural gas; 315,000 BTU/hr propane. |
| Output | ||
| CSA output | 295 MBH | 295,000 BTU/hr (NG) per the service-manual appendix. |
| Efficiency | ||
| Efficiency (BTS 2000 at 80/180 °F) | 96.1 part load / 90.8 full load | The 100 kW model carries BTS 2000 figures instead of an AFUE row in the service-manual appendix. CA product page states 'up to 93% AFUE' for the family. |
| Venting and air | ||
| Flue gas connection | 4" (100 mm); 4"/4" (100 mm) parallel for room-air-independent | Free fan feed pressure 0.883 in w.c. (220 Pa) per the IOM. |
| Physical and connections | ||
| Weight (without packaging) | 154 lb | 154 lb (70 kg) without a pump group per the IOM and service manual. The CA product page copy says 'only 150 lbs each'. |
| Dimensions (W x H x D) | 50.4 × 20.5 × 18.3 in (1280 × 520 × 465 mm), height × width × depth, with pump group | Per the manual technical data table. |
| Maximum flow temperature | 180 °F | 180 °F (82 °C) per the IOM; the service-manual appendix prints 190 °F (88 °C) — a doc-vs-doc difference noted by Boilers.ca. |
| Maximum working pressure (boiler) | 50 psi | 50 psi (3.6 bar). |
| Heating circuit volume of heat exchanger | 1.3 gal | 1.3 gal (5.0 l). |
| Pump group pump | UP 26-99 | Per the IOM technical specifications. |
| Electrical | ||
| Electrical power consumption, full load | 156 W | Without a pump group. |
| Electrical power consumption, partial load | 29 W | Without a pump group. |
| Operating limits and other | ||
| Fuel | Natural gas or propane | Separate NG and LPG ratings in the manual; LPG requires the gas conversion kit included with the appliance. |
| Derate above sea level | 2.1% per 1,000 ft (NG) | NG 100 kW row per the service-manual appendix; propane 2.0%. |
Manuals
- Logamax plus GB162-80 kW/100 kW Installation Instructions (doc 6720820102, 2017/05 US)6720820102 · 2017-05
- GB162 Service Instructions (doc 6720614965, 11.2012 US)6720614965 · 2012-11
Alerts documented for this model
- -
- -
- -A 208
- -H 200
- -H 200
- =H 201
- 0A 202
- 0A 305
- 0C 283
- 0E 265
- 0H 203
- 0L 284
- 0U 270
- 0Y 204
- 0Y 276
- 0Y 277
- 0Y 285
- 1A 316
- 1C 210
- 1U 317
- 1Y 318
- 2E 207
- 2F 260
- 2F 271
- 2L 266
- 2P 212
- 2U 213
- 2Y 281
- 2Y 282
- 3A 264
- 3C 217
- 3F 273
- 3L 214
- 3P 216
- 3Y 215
- 4A 218
- 4C 224
- 4E 278
- 4F 219
- 4L 220
- 4P 221
- 4U 222
- 4Y 223
- 5C 268
- 5H 268
- 5H
- 5L
- 6A 227
- 6A 227
- 6C 228
- 6C 306
- 6L 229
- 6P 269
- 7C 231
- 7H 328
- 7L 261
- 7L 280
- 8Y 232
- 888
- 9A 235
- 9H 237
- 9H 267
- 9H 272
- 9L 234
- 9L 238
- 9P 239
- 9U 233
- A01 800
- A01 808
- A01 809
- A01 810
- A01 811
- A01 816
- A01 828
- A01 816
- A11 806
- A11 816
- A11 840
- A11 841
- A11 815
- A11 816
- A18 825
- A21 816
- A22 816
- A23 816
- A32 807
- A32 816
- A33 807
- A33 816
- A51 812
- A51 813
- A51 814
- A51 816
- CA 286
- C0 288
- C0 289
- CU 240
- CY 241
- EL 290
- E 242 to 287
- H7
- P-.-
- RE
Frequently asked questions
What is the CSA output of the GB162-100 kW?
295,000 BTU/hr on natural gas per the service-manual appendix, with input from 72,000 to 333,000 BTU/hr (315,000 on propane).
Why does the 100 kW not have an AFUE number?
The service-manual appendix prints BTS 2000 figures for the 100 kW (96.1 part load, 90.8 full load at 80/180 °F) instead of an AFUE row, while the 80 kW gets AFUE 93.8/93.9. Bosch's CA page claims 'up to 93% AFUE' for the GB162 family.
Can the GB162-100 kW be cascaded?
Yes — cascading is the GB162's design focus per Bosch's CA page: typically two to four boilers, expandable up to eight, with common venting of up to four.
Questions about the Buderus GB162-100 kW?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Bosch Home Comfort Canada — Buderus GB162 · accessed September 7, 2026
- GB162 Installation Instructions (6720820102) · accessed September 7, 2026
- GB162 Service Instructions (6720614965) · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.