Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Smith GVX-140 and Smith GVX-165 are both non-condensing boilers in the Smith Cast Iron Boilers GVX Series (discontinued) line. The Smith GVX-140 is rated 140 MBH input, 116 MBH gross output and 82% AFUE, and the Smith GVX-165 is rated 165 MBH input, 136 MBH gross output and 82% AFUE. Smith GVX-165 lists 25 MBH more input than Smith GVX-140 (165 MBH against 140 MBH). Both list the same published AFUE of 82%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Smith GVX-140 | Smith GVX-165 |
|---|---|---|
| AGA input (as printed) | 140 MBH | 165 MBH |
| DOE heating capacity | 116 MBH | 136 MBH |
| Net I=B=R water rating | 101 MBH | 118 MBH |
| AFUE | 82 % | 82 % |
| Venting | Optional power vent (GVX model) per BSG-10; no per-size vent table printed | Optional power vent (GVX model) per BSG-10; no per-size vent table printed |
| Fuel | Natural gas or propane | Natural gas or propane |
Published ratings: the Smith GVX-140 is rated 140 MBH input, 116 MBH gross output and 82% AFUE; the Smith GVX-165 is rated 165 MBH input, 136 MBH gross output and 82% AFUE. Smith GVX-165 lists 25 MBH more input than Smith GVX-140 (165 MBH against 140 MBH). Both list the same published AFUE of 82%.
Both records print the same AFUE (82%), venting (Optional power vent (GVX model) per BSG-10; no per-size vent table printed) and fuel (Natural gas or propane), per the cited sources.
Smith Cast Iron Boilers
The Smith GVX-140 is a discontinued residential cast-iron water boiler rated 140 MBH AGA input with 116 MBH DOE heating capacity, 101 MBH net I=B=R and 82% AFUE, offered with an optional power vent.
Smith Cast Iron Boilers
The Smith GVX-165 is a discontinued residential cast-iron water boiler rated 165 MBH AGA input with 136 MBH DOE heating capacity, 118 MBH net I=B=R and 82% AFUE, offered with an optional power vent.
The Smith GVX-165 lists 165 MBH, against 140 MBH on the Smith GVX-140, per the cited documentation.
Both list the same AFUE of 82%.
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.