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Comparison
Verdict in brief
Both the Buderus SSB120 and the Buderus SSB160 belong to the Bosch Thermotechnology Buderus SSB (85-512, discontinued) line of condensing boilers. The Buderus SSB120 is documented at 23.884–119.42 MBH input, 96 MBH net rating and 96% AFUE, while the Buderus SSB160 is documented at 32.073–160.364 MBH input, 129 MBH net rating and 96% AFUE. Buderus SSB160 lists 40.94 MBH more input than Buderus SSB120 (160.364 MBH against 119.42 MBH). Both list the same published AFUE of 96%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Buderus SSB120 | Buderus SSB160 |
|---|---|---|
| Input, minimum | 23.884 MBH | 32.073 MBH |
| Input, maximum | 119.42 MBH | 160.364 MBH |
| Net rating (AHRI) | 96 MBH | 129 MBH |
| Heating capacity (AHRI) | 110 MBH | 148 MBH |
| Efficiency (AFUE) | 96 % | 96 % |
| Turndown | 5:1 | 5:1 |
| Dimensions (W × H × D) | 20 × 47 1/2 × 15 3/8 in (508 × 1206 × 388 mm) | 20 × 47 1/2 × 15 3/8 in (508 × 1206 × 388 mm) |
| Fuel | Natural gas or propane | Natural gas or propane |
| Heat exchanger | Stainless steel condensing heat exchanger | Stainless steel condensing heat exchanger |
| Gas connection | 3/4" NPT | 3/4" NPT |
| Water connections | 1" | 1" |
| Vent/air intake connections | 2" (60 mm) | 2" (60 mm) |
| Weight (dry) | 132 lb | 154 lb |
| Surface heat exchanger | 10.76 sq ft (1.0 m²) | 12.91 sq ft (1.2 m²) |
| Noise rating | 44 dB | 49 dB |
| Maximum allowable working pressure (MAWP) | 80 psi | 80 psi |
| Maximum operating temperature | 194 °F | 194 °F |
Published ratings: the Buderus SSB120 is rated 23.884–119.42 MBH input, 96 MBH net rating and 96% AFUE; the Buderus SSB160 is rated 32.073–160.364 MBH input, 129 MBH net rating and 96% AFUE. Buderus SSB160 lists 40.94 MBH more input than Buderus SSB120 (160.364 MBH against 119.42 MBH). Both list the same published AFUE of 96%.
The weight differs: the Buderus SSB120 lists 132 lb, while the Buderus SSB160 lists 154 lb. The surface heat exchanger differs: the Buderus SSB120 lists 10.76 sq ft (1.0 m²), while the Buderus SSB160 lists 12.91 sq ft (1.2 m²). The noise rating differs: the Buderus SSB120 lists 44 dB, while the Buderus SSB160 lists 49 dB.
Both records print the same AFUE (96%), turndown (5:1), dimensions (20 × 47 1/2 × 15 3/8 in (508 × 1206 × 388 mm)) and fuel (Natural gas or propane), per the cited sources.
Bosch Thermotechnology
The Buderus SSB120 is a discontinued wall-hung commercial/residential stainless steel condensing boiler rated 119,420 BTU/hr maximum input with 5:1 turndown, 96% AFUE and 96 MBH net rating.
Bosch Thermotechnology
The Buderus SSB160 is a discontinued wall-hung commercial/residential stainless steel condensing boiler rated 160,364 BTU/hr maximum input with 5:1 turndown, 96% AFUE and 129 MBH net rating.
The Buderus SSB160 lists 160.364 MBH, against 119.42 MBH on the Buderus SSB120, per the cited documentation.
Both list the same AFUE of 96%.
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.