Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Utica MAH-165 and Utica MAC-150 are both combination (combi) boilers in the Utica Boilers MAC/MAH (AI condensing) line. The Utica MAH-165 is rated 95% AFUE, and the Utica MAC-150 is rated 95% AFUE. Both list the same published AFUE of 95%. Both list the same published shipping weight (94-125 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica MAH-165 | Utica MAC-150 |
|---|---|---|
| AFUE | 95 % | 95 % |
| Weight | 94-125 lb | 94-125 lb |
| Dimensions (H x W x D) | 30" x 17-3/4", depth 13-9/16" or 21-1/2" | 30" x 17-3/4", depth 13-9/16" or 21-1/2" |
| Venting | Coaxial polypropylene or 2-pipe polypropylene/CPVC/PVC | Coaxial polypropylene or 2-pipe polypropylene/CPVC/PVC |
| Turndown, heating mode | 5.5:1 | 5.7:1 |
| Heat exchanger | 316L stainless steel heat exchanger and burner | 316L stainless steel heat exchanger and burner plus stainless steel brazed-plate DHW heat exchanger |
| Gas type | Natural gas or LP — recognized automatically | Natural gas or LP — recognized automatically |
Published ratings: the Utica MAH-165 is rated 95% AFUE; the Utica MAC-150 is rated 95% AFUE. Both list the same published AFUE of 95%.
The turndown, heating mode differs: the Utica MAH-165 lists 5.5:1, while the Utica MAC-150 lists 5.7:1. The heat exchanger differs: the Utica MAH-165 lists 316L stainless steel heat exchanger and burner, while the Utica MAC-150 lists 316L stainless steel heat exchanger and burner plus stainless steel brazed-plate DHW heat exchanger.
Both records print the same AFUE (95%), shipping weight (94-125 lb), dimensions (30" x 17-3/4", depth 13-9/16" or 21-1/2") and venting (Coaxial polypropylene or 2-pipe polypropylene/CPVC/PVC), per the cited sources.
Utica Boilers
The Utica MAH-165 is the 165-class (largest) central-heating model central-heating model of the MAH 'AI' condensing line: 95% AFUE, 5.5:1 heating turndown and the 316L stainless steel heat exchanger. The MAH page prints '(While supplies last)' with no current documents, so this model is discontinued (sell-through).
Utica Boilers
The Utica MAC-150 is the 150-class mid-size combi combi of the MAC 'AI' condensing line: 95% AFUE, on-demand DHW at 3.5 GPM (70 °F rise), 5.7:1 heating turndown and the 316L stainless steel heat exchanger. The MAC page prints '(While supplies last)' with no current documents, so this model is discontinued (sell-through).
Both list the same AFUE of 95%.
Both list the same AFUE, shipping weight, dimensions and venting, per the cited sources.
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.