Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The U.S. Boiler Company Independence IN4I and U.S. Boiler Company Independence IN4PVNI are both non-condensing boilers in the U.S. Boiler Company Independence line. Published ratings: U.S. Boiler Company Independence IN4I at 105 MBH input, 87 MBH heating capacity and 82% AFUE; U.S. Boiler Company Independence IN4PVNI at 105 MBH input, 87 MBH heating capacity and 82.2% AFUE. Both list the same published input of 105 MBH. U.S. Boiler Company Independence IN4PVNI carries the higher published AFUE at 82.2%, against 82%. U.S. Boiler Company Independence IN4PVNI lists 5 lb more shipping weight than U.S. Boiler Company Independence IN4I (425 lb against 420 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | U.S. Boiler Company Independence IN4I | U.S. Boiler Company Independence IN4PVNI |
|---|---|---|
| Input | 105 MBH | 105 MBH |
| DOE heating capacity | 87 MBH | 87 MBH |
| Efficiency (AFUE) | 82 % | 82.2 % |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
| Approx. shipping weight | 420 lb | 425 lb |
| Venting | Chimney vented with vent damper and low-profile rear drafthood | Power vented (draft-inducing fan); 3" AL29-4C stainless steel only |
| Fuel | Natural gas; LP conversion kits available on IN3–IN9 chimney-vented models | Natural gas (packaged) |
| AHRI net steam rating | 65 MBH | 65 MBH |
| Steam square feet | 271 sq ft | 271 sq ft |
| Minimum chimney requirements | 5×15 in chimney | 35 eq ft (3" AL29-4C) |
| Available configurations | Packaged, Semi-Pak and Knock-Down | Packaged only |
Published ratings: the U.S. Boiler Company Independence IN4I is rated 105 MBH input, 87 MBH heating capacity and 82% AFUE; the U.S. Boiler Company Independence IN4PVNI is rated 105 MBH input, 87 MBH heating capacity and 82.2% AFUE. Both list the same published input of 105 MBH. U.S. Boiler Company Independence IN4PVNI carries the higher published AFUE at 82.2%, against 82%.
U.S. Boiler Company Independence IN4PVNI lists 5 lb more shipping weight than U.S. Boiler Company Independence IN4I (425 lb against 420 lb). The venting differs: the U.S. Boiler Company Independence IN4I lists Chimney vented with vent damper and low-profile rear drafthood, while the U.S. Boiler Company Independence IN4PVNI lists Power vented (draft-inducing fan); 3" AL29-4C stainless steel only. The fuel differs: the U.S. Boiler Company Independence IN4I lists Natural gas; LP conversion kits available on IN3–IN9 chimney-vented models, while the U.S. Boiler Company Independence IN4PVNI lists Natural gas (packaged). The minimum chimney requirements differs: the U.S. Boiler Company Independence IN4I lists 5×15 in chimney, while the U.S. Boiler Company Independence IN4PVNI lists 35 eq ft (3" AL29-4C).
Both records print the same input (105 MBH), heating capacity (87 MBH), domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater) and AHRI net steam rating (65 MBH), per the cited sources.
U.S. Boiler Company
The U.S. Boiler Company Independence IN4I is the second chimney-vented size: 105 MBH input with 87 MBH DOE heating capacity and a 65 MBH AHRI net steam rating at 82% AFUE, chimney vented (5×15 in chimney).
U.S. Boiler Company
The U.S. Boiler Company Independence IN4PVNI is the second power-vented size: 105 MBH input with 87 MBH DOE heating capacity and a 65 MBH AHRI net steam rating at 82.2% AFUE, power vented in 3" AL29-4C stainless.
Yes — both list 105 MBH in the cited documentation.
The U.S. Boiler Company Independence IN4PVNI carries the higher published AFUE at 82.2%, against 82%.
It ships at 425 lb against 420 lb for the U.S. Boiler Company Independence IN4I, 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.