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 Oneida CH-100 and CH-120 are the mid-range Oneida heating-only boilers and are physically interchangeable: the same wall-hung cabinet at 95.2% AFUE with up to 10:1 turndown. The CH-120 raises input from 100 to 120 MBH and heating capacity from 92 to 110 MBH (net AHRI 96 MBH against 80 MBH), with its minimum fire stepping up from 10 to 12 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica Oneida CH-100 | Utica Oneida CH-120 |
|---|---|---|
| Central-heating input, minimum | 10 MBH | 12 MBH |
| Central-heating input, maximum | 100 MBH | 120 MBH |
| AFUE | 95.2 % | 95.2 % |
| Heating capacity | 92 MBH | 110 MBH |
| Net AHRI water rating | 80 MBH | 96 MBH |
| Turndown | Up to 10:1 | Up to 10:1 |
| Dimensions (H x W x D) | 28.2" x 17.4" x 16.9" | 28.2" x 17.4" x 16.9" |
Both models are wall-hung, heating-only Oneida CH residential boilers on the same stainless water-tube platform: 95.2% AFUE, up to 10:1 turndown, the shared 28.2 x 17.4 x 16.9 in cabinet, 3/4" NPT CH connections and 3/4" NPT gas.
The brochure table prints 10–100 MBH input with 92 MBH heating capacity and an 80 MBH net AHRI water rating on the CH-100, against 12–120 MBH input, 110 MBH heating capacity and a 96 MBH net AHRI rating on the CH-120.
With minimum fires of 10 and 12 MBH, day-to-day modulation is nearly identical below the CH-100's ceiling, so the decision reduces to whether the design-day heat loss needs the extra 18 MBH of heating capacity the CH-120 carries.
Utica Boilers
The Oneida CH-100 is Utica's 100 MBH-class wall-hung residential heating-only boiler: 10 to 100 MBH central-heating input at 95.2% AFUE with 92 MBH heating capacity, a 80 MBH net AHRI water rating and up to 10:1 turndown.
Utica Boilers
The Oneida CH-120 is Utica's 120 MBH-class wall-hung residential heating-only boiler: 12 to 120 MBH central-heating input at 95.2% AFUE with 110 MBH heating capacity, a 96 MBH net AHRI water rating and up to 10:1 turndown.
No — every residential Oneida size shares the 28.2 x 17.4 x 16.9 in wall-hung cabinet and the 74–101 lb weight range printed in the brochure.
Yes — 95.2% AFUE is printed for every residential Oneida model in the official brochure table.
A licensed heat-loss calculation settles it: the CH-100 covers most homes under 92 MBH of capacity, and the CH-120 only buys margin when the load approaches that ceiling.
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 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.