Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the Utica MAC-150 and the Utica MAH-100 belong to the Utica Boilers MAC/MAH (AI condensing) line of combination (combi) boilers. The Utica MAC-150 is rated 95% AFUE, and the Utica MAH-100 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 MAC-150 | Utica MAH-100 |
|---|---|---|
| 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" |
| Venting | Coaxial polypropylene or 2-pipe polypropylene/CPVC/PVC | Coaxial polypropylene or 2-pipe polypropylene/CPVC/PVC |
| Turndown, heating mode | 5.7:1 | 5.6:1 |
| Heat exchanger | 316L stainless steel heat exchanger and burner plus stainless steel brazed-plate DHW heat exchanger | 316L stainless steel heat exchanger and burner |
| Gas type | Natural gas or LP — recognized automatically | Natural gas or LP — recognized automatically |
Published ratings: the Utica MAC-150 is rated 95% AFUE; the Utica MAH-100 is rated 95% AFUE. Both list the same published AFUE of 95%.
The dimensions differs: the Utica MAC-150 lists 30" x 17-3/4", depth 13-9/16" or 21-1/2", while the Utica MAH-100 lists 30" x 17-3/4". The turndown, heating mode differs: the Utica MAC-150 lists 5.7:1, while the Utica MAH-100 lists 5.6:1. The heat exchanger differs: the Utica MAC-150 lists 316L stainless steel heat exchanger and burner plus stainless steel brazed-plate DHW heat exchanger, while the Utica MAH-100 lists 316L stainless steel heat exchanger and burner.
Both records print the same AFUE (95%), shipping weight (94-125 lb), venting (Coaxial polypropylene or 2-pipe polypropylene/CPVC/PVC) and gas type (Natural gas or LP — recognized automatically), per the cited sources.
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).
Utica Boilers
The Utica MAH-100 is the 100-class central-heating model central-heating model of the MAH 'AI' condensing line: 95% AFUE, 5.6:1 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).
Both list the same AFUE of 95%.
Both list the same AFUE, shipping weight, venting and gas type, 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.