Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Oneida CH-80 and CH-100 are the two smallest Oneida heating-only boilers and share the residential wall cabinet, 95.2% AFUE, up to 10:1 turndown and the 8–10 MBH-class minimum fires. The CH-100 adds 20 MBH of input ceiling and 18 MBH of heating capacity (92 versus 74 MBH) with the net AHRI water rating up from 64 to 80 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica Oneida CH-80 | Utica Oneida CH-100 |
|---|---|---|
| Central-heating input, minimum | 8 MBH | 10 MBH |
| Central-heating input, maximum | 80 MBH | 100 MBH |
| AFUE | 95.2 % | 95.2 % |
| Heating capacity | 74 MBH | 92 MBH |
| Net AHRI water rating | 64 MBH | 80 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 are wall-hung heating-only boilers of the Oneida CH residential line — the CH (Central Heat) models Utica documents as five sizes from 80,000 to 180,000 BTU/hr. They share the 28.2 x 17.4 x 16.9 in cabinet, the 74–101 lb weight range, 95.2% AFUE, up to 10:1 turndown and 3/4" NPT CH connections.
The CH-80 fires 8–80 MBH and the CH-100 10–100 MBH, with heating capacity at 74 and 92 MBH and net AHRI water ratings of 64 and 80 MBH respectively. Minimum fires are close enough that neither gains a real low-fire advantage in mild weather.
Neither produces domestic hot water — the CH models are central-heat only, with hot water left to a separate tank or water heater. The heat-loss calculation decides between the two sizes; the CO combi versions of comparable size add the DHW side.
Utica Boilers
The Oneida CH-80 is Utica's 80 MBH-class wall-hung residential heating-only boiler: 8 to 80 MBH central-heating input at 95.2% AFUE with 74 MBH heating capacity, a 64 MBH net AHRI water rating and up to 10:1 turndown.
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.
Effectively: both sit in the shared 28.2 x 17.4 x 16.9 in residential cabinet at 95.2% AFUE. Only the firing range differs — 80 MBH against 100 MBH of input ceiling.
No — CH codes are central-heat only. Domestic hot water needs a separate tank or water heater; the Oneida CO combis integrate it.
Either could carry it; the CH-80's 74 MBH heating capacity with the 8 MBH minimum fire usually wins unless the calculation needs the CH-100's headroom.
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.