Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Utica UB90-50 (Series 4) and Utica UB90-75 (Series 4) are both condensing boilers in the Utica Boilers UB90 Series 4 (UB90-50 to UB90-100) line. Published ratings: Utica UB90-50 (Series 4) at 90% AFUE; Utica UB90-75 (Series 4) at 90% AFUE. Both list the same published AFUE of 90%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Utica UB90-50 (Series 4) | Utica UB90-75 (Series 4) |
|---|---|---|
| AFUE | 90 % | 90 % |
| Venting | Sealed combustion, direct vent; polypropylene approved | Sealed combustion, direct vent; polypropylene approved |
| Heat exchanger | Cast aluminum | Cast aluminum |
| Ignition / control | Hot surface ignition (HSI) integrated boiler control; Hydrolevel combination high limit and LWCO with boiler water temperature reset | Hot surface ignition (HSI) integrated boiler control; Hydrolevel combination high limit and LWCO with boiler water temperature reset |
| Burner | Stainless steel premix burner | Stainless steel premix burner |
| Rating | 50 psi | 50 psi |
| Warranty | 15-year limited warranty | 15-year limited warranty |
Published ratings: the Utica UB90-50 (Series 4) is rated 90% AFUE; the Utica UB90-75 (Series 4) is rated 90% AFUE. Both list the same published AFUE of 90%.
Both records print the same AFUE (90%), venting (Sealed combustion, direct vent; polypropylene approved), heat exchanger (Cast aluminum) and ignition / control (Hot surface ignition (HSI) integrated boiler control; Hydrolevel combination high limit and LWCO with boiler water temperature reset), per the cited sources.
Utica Boilers
The Utica UB90-50 is the smallest of the three UB90 Series 4 sizes — a 90% AFUE condensing boiler on the cast aluminum heat exchanger with HSI ignition and the Hydrolevel combination high-limit/LWCO control with reset. The UB90 Series 4 page carries current documents (IOM Rev. F), so this model is recorded as current.
Utica Boilers
The Utica UB90-75 is the middle of the three UB90 Series 4 sizes — a 90% AFUE condensing boiler on the cast aluminum heat exchanger with HSI ignition and the Hydrolevel combination high-limit/LWCO control with reset. The UB90 Series 4 page carries current documents (IOM Rev. F), so this model is recorded as current.
Both list the same AFUE of 90%.
Both list the same AFUE, venting, heat exchanger and ignition / control, 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.