U.S. Boiler Company · Independence
U.S. Boiler Company Independence IN6PVNI
The U.S. Boiler Company Independence IN6PVNI is the largest power-vented Independence: 175 MBH input with 145 MBH DOE heating capacity and a 109 MBH AHRI net steam rating at 82.2% AFUE, power vented in 3" AL29-4C stainless.
Key figures
- Max input
- 175 MBH
- Max CSA output
- —
- AFUE
- 82.2 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
U.S. Boiler Company Independence IN6PVNI in practice
The Independence IN6PVNI is a cast-iron gas steam boiler rated at 175 MBH input. Its row in the Independence Product Data Sheet (Form HYDL07084) prints 145 MBH DOE heating capacity, a 109 MBH AHRI net steam rating (1.333 piping and pickup allowance), 454 steam square feet and 82.2% AFUE.
This is one of the four Independence PV power-vented models: a draft-inducing fan pulls hot gases through the heat exchanger so the boiler can be installed without a chimney, venting through 3" AL29-4C stainless steel only to a maximum of 35 eq ft (3" AL29-4C). It ships packaged at approximately 560 lb with a suction pressure switch, thermostat blower relay and vent accessory carton.
Boilers.ca documents this size at model level from the Independence Product Data Sheet and links the published submittal form. Steam, gas and venting work belongs with a licensed contractor. No official Canadian-sales statement was found, so canadianStatus stays 'unknown'.
Best suited to
- 175 MBH residential steam loads
- Homes without a chimney (power-vented installation)
- Owners comparing Independence chimney and PV options by size
Applicability and support
- Model number
- IN6PVNI
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by U.S. Boiler Company. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 175 MBH | Maximum input per the Independence Product Data Sheet ratings table (sea level to 2,000 ft; reduce four percent per 1,000 ft above that, up to 5,000 ft, U.S. only). |
| Output | ||
| DOE heating capacity | 145 MBH | DOE heating capacity per the Independence Product Data Sheet ratings table. |
| AHRI net steam rating | 109 MBH | AHRI net steam rating per the Independence Product Data Sheet, based on a piping and pickup allowance of 1.333. |
| Steam square feet | 454 sq ft | Steam square feet per the Independence Product Data Sheet ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 82.2 % | AFUE per the Independence Product Data Sheet ratings table. |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Vent length (3" AL29-4C only) | 35 eq ft (3" AL29-4C) | Independence PV vent pipe length is listed in equivalent feet; elbows and tees subtract from the total. Approved venting is 3" AL29-4C stainless steel only, as specified in the I&O instructions. |
| Venting | Power vented (draft-inducing fan); 3" AL29-4C stainless steel only | The PV option uses a draft-inducing fan pulling hot gases through the heat exchanger, with suction pressure switch, thermostat blower relay and vent accessory carton. |
| Physical and connections | ||
| Approx. shipping weight | 560 lb | Approximate shipping weight per the Independence Product Data Sheet ratings table. |
| Operating limits and other | ||
| Available configurations | Packaged only | Independence PV boilers are available as Packaged per the Product Data Sheet. |
| Fuel | Natural gas (packaged) | Independence PV ratings are printed for natural gas, packaged. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the Independence IN6PVNI's ratings?
175 MBH input, 145 MBH DOE heating capacity, a 109 MBH AHRI net steam rating (454 sq ft of steam) and 82.2% AFUE per the Independence Product Data Sheet.
Can the Independence IN6PVNI be converted to LP gas?
The Independence PV ratings are printed for natural gas, packaged; LP conversion is documented for the chimney-vented IN3I–IN9I models, not the PV line.
Questions about the U.S. Boiler Company Independence IN6PVNI?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Compare and explore
- U.S. Boiler Company Independence IN3ISame series
- U.S. Boiler Company Independence IN4ISame series
- U.S. Boiler Company Independence IN5ISame series
- U.S. Boiler Company Independence IN6ISame series
- U.S. Boiler Company Independence IN7ISame series
- U.S. Boiler Company Independence IN8ISame series
- U.S. Boiler Company Independence IN9ISame series
- U.S. Boiler Company Independence IN3PVNISame series
- U.S. Boiler Company Independence IN4PVNISame series
- U.S. Boiler Company Independence IN5PVNISame series
- Independence series hub
- Buying guide
Sources and verification
- U.S. Boiler Company — Independence Gas-Fired Steam Boiler product page · accessed September 9, 2026
- Independence Series Product Data Sheet, Form HYDL07084 (PDF) · HYDL07084 · accessed September 9, 2026
- Independence Series Submittal Form (PDF) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.