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 Royal CH-150 is the fourth rung of the Royal CH residential ladder: input rises from 120 to 150 MBH and heating capacity from 110 to 139 MBH (net AHRI water 121 MBH against 96 MBH), still at 95.2% AFUE in the same wall-hung cabinet. Its minimum fire steps up from 12 to 15 MBH — a modest low-fire cost for 29 MBH of extra ceiling.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Dunkirk Royal CH-120 | Dunkirk Royal CH-150 |
|---|---|---|
| Central-heating input, minimum | 12 MBH | 15 MBH |
| Central-heating input, maximum | 120 MBH | 150 MBH |
| AFUE | 95.2 % | 95.2 % |
| Heating capacity | 110 MBH | 139 MBH |
| Net AHRI water rating | 96 MBH | 121 MBH |
| Turndown | Up to 10:1 | Up to 10:1 |
| Dimensions (H x W x D) | 28.23" x 17.4" x 16.93" | 28.23" x 17.4" x 16.93" |
Both are wall-hung, heating-only Royal CH residential models sharing the stainless steel water-tube platform at 95.2% AFUE with up to 10:1 turndown, the same cabinet and the same 3/4" NPT CH and gas connections.
The CH-120 prints 12-120 MBH input, 110 MBH heating capacity and a 96 MBH net AHRI water rating; the CH-150 prints 15-150 MBH input, 139 MBH heating capacity and a 121 MBH net AHRI rating — figures from the official brochure table that a heat-loss calculation compares directly.
The CH-150's 15 MBH minimum fire against the CH-120's 12 MBH means the larger boiler sits on a slightly higher floor in shoulder seasons; otherwise the two are identical to install. Homes whose load stays under the CH-120's 110 MBH heating capacity give up little by staying smaller.
Dunkirk Boilers
The Royal CH-120 is Dunkirk'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.
Dunkirk Boilers
The Royal CH-150 is Dunkirk's 150 MBH-class wall-hung residential heating-only boiler: 15 to 150 MBH central-heating input at 95.2% AFUE with 139 MBH heating capacity, a 121 MBH net AHRI water rating and up to 10:1 turndown.
Only when the heat-loss calculation needs more than 110 MBH of heating capacity on a design day — both fire down to the low teens of MBH, so extra ceiling without a matching load just raises the minimum fire.
Yes — same 28.23 x 17.4 x 16.93 in cabinet, same venting kit (3" flue with 2" reducer, 3-in-1 adjustable connector) and same connection sizes.
No — the CH-150 sits below the CH-180, and Dunkirk documents larger commercial CH models separately.
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.