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 IN3I and U.S. Boiler Company Independence IN3PVNI are both non-condensing boilers in the U.S. Boiler Company Independence line. The U.S. Boiler Company Independence IN3I is documented at 62 MBH input, 51 MBH heating capacity and 82% AFUE, while the U.S. Boiler Company Independence IN3PVNI is documented at 62 MBH input, 52 MBH heating capacity and 83.2% AFUE. Both list the same published input of 62 MBH. U.S. Boiler Company Independence IN3PVNI lists 1.2 percentage points more AFUE than U.S. Boiler Company Independence IN3I (83.2% against 82%). U.S. Boiler Company Independence IN3PVNI lists 5 lb more shipping weight than U.S. Boiler Company Independence IN3I (355 lb against 350 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 IN3I | U.S. Boiler Company Independence IN3PVNI |
|---|---|---|
| Input | 62 MBH | 62 MBH |
| DOE heating capacity | 51 MBH | 52 MBH |
| Efficiency (AFUE) | 82 % | 83.2 % |
| 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 | 350 lb | 355 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 | 38 MBH | 39 MBH |
| Steam square feet | 158 sq ft | 163 sq ft |
| Minimum chimney requirements | 4×15 in chimney | 45 eq ft (3" AL29-4C) |
| Available configurations | Packaged, Semi-Pak and Knock-Down | Packaged only |
Published ratings: the U.S. Boiler Company Independence IN3I is rated 62 MBH input, 51 MBH heating capacity and 82% AFUE; the U.S. Boiler Company Independence IN3PVNI is rated 62 MBH input, 52 MBH heating capacity and 83.2% AFUE. Both list the same published input of 62 MBH. U.S. Boiler Company Independence IN3PVNI lists 1.2 percentage points more AFUE than U.S. Boiler Company Independence IN3I (83.2% against 82%).
U.S. Boiler Company Independence IN3PVNI lists 5 lb more shipping weight than U.S. Boiler Company Independence IN3I (355 lb against 350 lb). The venting differs: the U.S. Boiler Company Independence IN3I lists Chimney vented with vent damper and low-profile rear drafthood, while the U.S. Boiler Company Independence IN3PVNI lists Power vented (draft-inducing fan); 3" AL29-4C stainless steel only. The fuel differs: the U.S. Boiler Company Independence IN3I lists Natural gas; LP conversion kits available on IN3–IN9 chimney-vented models, while the U.S. Boiler Company Independence IN3PVNI lists Natural gas (packaged). The minimum chimney requirements differs: the U.S. Boiler Company Independence IN3I lists 4×15 in chimney, while the U.S. Boiler Company Independence IN3PVNI lists 45 eq ft (3" AL29-4C).
Both records print the same input (62 MBH) and domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), per the cited sources.
U.S. Boiler Company
The U.S. Boiler Company Independence IN3I is the smallest chimney-vented Independence: 62 MBH input with 51 MBH DOE heating capacity and a 38 MBH AHRI net steam rating at 82% AFUE, chimney vented (4×15 in chimney).
U.S. Boiler Company
The U.S. Boiler Company Independence IN3PVNI is the smallest power-vented model, with the line's highest 83.2% AFUE: 62 MBH input with 52 MBH DOE heating capacity and a 39 MBH AHRI net steam rating at 83.2% AFUE, power vented in 3" AL29-4C stainless.
Yes — both list 62 MBH in the cited documentation.
The U.S. Boiler Company Independence IN3PVNI carries the higher published AFUE at 83.2%, against 82%.
It ships at 355 lb against 350 lb for the U.S. Boiler Company Independence IN3I, 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.