Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Burnham · Series
Burnham's current gas-fired steam boilers from U.S. Boiler Company are the ALL-NEW SteamMax (75–550 MBH in 12 sizes, cast-iron, with an unmatched 10-year waterside corrosion warranty) and the Independence / Independence PV cast-iron residential steam boilers at AFUE ratings up to 82%.
Series facts
Independence: 'AFUE ratings of up to 82%' per the official page. SteamMax: an '82% Efficiency' badge is printed on the official page. Steam boilers are non-condensing cast-iron designs.
U.S. Boiler Company documents two current gas steam lines on usboiler.net (both fetched 2026-09-09). The SteamMax page ('NEW SteamMax gas-fired steam boiler') prints '75 – 550 MBH (in 12 sizes)' with the 'Unmatched 10-year waterside corrosion warranty (residential only, under 300 MBH only)' and an '82% Efficiency' badge. Its design bullets cover a robust, corrosion-resistant cast-iron sectional design, a larger 'steam chest' with increased steam disengaging area above a stable water line, wider internal waterways, no heat transfer pins above the water line and no crown sheet fins, more heat transfer pins below the water line, leak-free metal push nipples (not gaskets), steam risers in intermediate sections, 2" supply tappings with a 2" skimming port tapping, pre-cut near-boiler piping kits (residential models 075-250 MBH), a rear low-profile draft diverter, and packaged or knock-down delivery.
The Independence page (title 'Independence / Independence PV | Gas Fired Cast Iron Steam Boilers') is a current residential listing: 'The Independence is a residential, gas-fired boiler for steam systems. It is available for either natural or LP gas (on select chimney-vented models) and has AFUE ratings of up to 82%.' Standard equipment includes cast-iron push nipples, Honeywell operating controls, a vent damper and a rugged steel base assembly under a deluxe insulated powder-coated steel jacket; the Independence PV models are 'specifically configured to operate as direct vented products for installation in homes with a damaged or irreparable chimney'. The page prints 7 sizes, stainless steel burners, a limited 10-year heat exchanger warranty plus a one-year parts warranty, and links the Independence Product Data Sheet.
Both lines are current gas-steam cast-iron products (no retirement wording on either page); U.S. Boiler positions SteamMax alongside the still-sold Independence. Boilers.ca keeps both at hub level because batch8 captured no per-model ratings rows to transcribe (the SteamMax and Independence Product Data Sheets are linked here for the printed tables). No official Canadian-sales statement was found, so canadianStatus stays 'unknown'.
Highlights
SteamMax: 'Unmatched 10-year waterside corrosion warranty (residential only, under 300 MBH only)'. Independence: a limited 10-year heat exchanger warranty plus a one-year manufacturer's parts warranty. Both as printed on the official pages.
Models
One canonical page per model with input, output and efficiency kept separate.
Burnham
The Burnham Independence IN3I is a current gas-fired cast-iron steam boiler: 62 MBH maximum input for 51 MBH heating capacity and a 38 MBH net AHRI steam rating (158 sq ft) at 81.9% AFUE, requiring a 4 in. x 15 ft chimney and shipping at about 350 lb.
Burnham
The Burnham Independence IN4I is a current gas-fired cast-iron steam boiler: 105 MBH maximum input for 87 MBH heating capacity and a 65 MBH net AHRI steam rating (271 sq ft) at 82% AFUE, requiring a 5 in. x 15 ft chimney and shipping at about 420 lb.
Burnham
The Burnham Independence IN5I is a current gas-fired cast-iron steam boiler: 140 MBH maximum input for 115 MBH heating capacity and a 86 MBH net AHRI steam rating (358 sq ft) at 82% AFUE, requiring a 6 in. x 15 ft chimney and shipping at about 485 lb.
Burnham
The Burnham Independence IN6I is a current gas-fired cast-iron steam boiler: 175 MBH maximum input for 144 MBH heating capacity and a 108 MBH net AHRI steam rating (450 sq ft) at 82.1% AFUE, requiring a 6 in. x 15 ft (5 in. alternate) chimney and shipping at about 555 lb.
Burnham
The Burnham Independence IN7I is a current gas-fired cast-iron steam boiler: 210 MBH maximum input for 173 MBH heating capacity and a 130 MBH net AHRI steam rating (542 sq ft) at 82.1% AFUE, requiring a 7 in. x 15 ft chimney and shipping at about 620 lb.
Burnham
The Burnham Independence IN8I is a current gas-fired cast-iron steam boiler: 245 MBH maximum input for 202 MBH heating capacity and a 152 MBH net AHRI steam rating (633 sq ft) at 82.2% AFUE, requiring a 7 in. x 15 ft (5 in. alternate) chimney and shipping at about 690 lb.
Burnham
The Burnham Independence IN9I is a current gas-fired cast-iron steam boiler: 280 MBH maximum input for 231 MBH heating capacity and a 173 MBH net AHRI steam rating (721 sq ft) at 82.2% AFUE, requiring a 8 in. x 15 ft chimney and shipping at about 760 lb.
Burnham
The Burnham Independence IN10-I is a current gas-fired cast-iron steam boiler: 315 MBH maximum input for 250 MBH gross output and a 188 MBH net AHRI steam rating (783 sq ft) at 79.5% thermal efficiency, requiring a 8 in. x 15 ft (5 in. alternate) chimney and shipping at about 815 lb.
Burnham
The Burnham Independence IN11-I is a current gas-fired cast-iron steam boiler: 349 MBH maximum input for 277 MBH gross output and a 208 MBH net AHRI steam rating (867 sq ft) at 79.5% thermal efficiency, requiring a 9 in. x 15 ft chimney and shipping at about 885 lb.
Burnham
The Burnham Independence IN12-I is a current gas-fired cast-iron steam boiler: 385 MBH maximum input for 306 MBH gross output and a 230 MBH net AHRI steam rating (958 sq ft) at 79.5% thermal efficiency, requiring a 9 in. x 15 ft chimney and shipping at about 815 lb.
Burnham
The Burnham SteamMax STMX075 is a current gas-fired cast-iron steam boiler: 75 MBH input for 62 MBH output and a 47 MBH net AHRI steam rating (169 sq ft) at 82% AFUE, with 3 sections, a 5" vent and a 1/2" NPT gas connection.
Burnham
The Burnham SteamMax STMX100 is a current gas-fired cast-iron steam boiler: 100 MBH input for 82 MBH output and a 62 MBH net AHRI steam rating (258 sq ft) at 82% AFUE, with 3 sections, a 5" vent and a 1/2" NPT gas connection.
Burnham
The Burnham SteamMax STMX125 is a current gas-fired cast-iron steam boiler: 125 MBH input for 103 MBH output and a 77 MBH net AHRI steam rating (321 sq ft) at 82% AFUE, with 4 sections, a 6" vent and a 1/2" NPT gas connection.
Burnham
The Burnham SteamMax STMX150 is a current gas-fired cast-iron steam boiler: 150 MBH input for 124 MBH output and a 93 MBH net AHRI steam rating (388 sq ft) at 82% AFUE, with 4 sections, a 6" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX175 is a current gas-fired cast-iron steam boiler: 175 MBH input for 144 MBH output and a 108 MBH net AHRI steam rating (450 sq ft) at 82% AFUE, with 5 sections, a 7" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX200 is a current gas-fired cast-iron steam boiler: 200 MBH input for 165 MBH output and a 124 MBH net AHRI steam rating (517 sq ft) at 82% AFUE, with 5 sections, a 7" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX250 is a current gas-fired cast-iron steam boiler: 250 MBH input for 206 MBH output and a 155 MBH net AHRI steam rating (646 sq ft) at 82% AFUE, with 6 sections, a 8" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX299 is a current gas-fired cast-iron steam boiler: 299 MBH input for 246 MBH output and a 185 MBH net AHRI steam rating (771 sq ft) at 82% AFUE, with 7 sections, a 8" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX350 is a current gas-fired cast-iron steam boiler: 350 MBH input for 284 MBH output and a 213 MBH net AHRI steam rating (892 sq ft) at 81% AFUE / 82.5% combustion, with 8 sections, a 9" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX399 is a current gas-fired cast-iron steam boiler: 399 MBH input for 323 MBH output and a 242 MBH net AHRI steam rating (1013 sq ft) at 81% AFUE / 82.5% combustion, with 9 sections, a 9" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX450 is a current gas-fired cast-iron steam boiler: 450 MBH input for 365 MBH output and a 274 MBH net AHRI steam rating (1142 sq ft) at 81% AFUE / 82.5% combustion, with 10 sections, a 10" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX500 is a current gas-fired cast-iron steam boiler: 500 MBH input for 405 MBH output and a 304 MBH net AHRI steam rating (1271 sq ft) at 81% AFUE / 82.5% combustion, with 11 sections, a 10" vent and a 3/4" NPT gas connection.
Burnham
The Burnham SteamMax STMX550 is a current gas-fired cast-iron steam boiler: 550 MBH input for 446 MBH output and a 335 MBH net AHRI steam rating (1396 sq ft) at 81% AFUE / 82.5% combustion, with 12 sections, a 12" vent and a 3/4" NPT gas connection.
| Specification | Burnham Independence IN3I | Burnham Independence IN4I | Burnham Independence IN5I | Burnham Independence IN6I | Burnham Independence IN7I | Burnham Independence IN8I | Burnham Independence IN9I | Burnham Independence IN10-I | Burnham Independence IN11-I | Burnham Independence IN12-I | Burnham SteamMax STMX075 | Burnham SteamMax STMX100 | Burnham SteamMax STMX125 | Burnham SteamMax STMX150 | Burnham SteamMax STMX175 | Burnham SteamMax STMX200 | Burnham SteamMax STMX250 | Burnham SteamMax STMX299 | Burnham SteamMax STMX350 | Burnham SteamMax STMX399 | Burnham SteamMax STMX450 | Burnham SteamMax STMX500 | Burnham SteamMax STMX550 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Maximum input | 62 MBH | 105 MBH | 140 MBH | 175 MBH | 210 MBH | 245 MBH | 280 MBH | 315 MBH | 349 MBH | 385 MBH | — | — | — | — | — | — | — | — | — | — | — | — | — |
| output-max | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Efficiency (AFUE) | 81.9 % | 82 % | 82 % | 82.1 % | 82.1 % | 82.2 % | 82.2 % | — | — | — | 82 % | 82 % | 82 % | 82 % | 82 % | 82 % | 82 % | 82 % | 81 % | 81 % | 81 % | 81 % | 81 % |
| turndown | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| vent-max-3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| Approximate shipping weight | 350 lb | 420 lb | 485 lb | 555 lb | 620 lb | 690 lb | 760 lb | 815 lb | 885 lb | 815 lb | Not printed (conversion kit required; see accessories) | 484 lb | 600 lb | 600 lb | 729 lb | 729 lb | 842 lb | 881 lb | 1,008 lb | 1,123 lb | 1,239 lb | 1,354 lb | 1,469 lb |
Read the full comparison: Burnham Independence IN3I vs Burnham SteamMax STMX075 →
Read the full comparison: Burnham SteamMax STMX075 vs STMX100 →
Read the full comparison: Burnham SteamMax STMX100 vs Burnham Independence IN4I →
Read the full comparison: Burnham Independence IN4I vs Burnham SteamMax STMX125 →
Error codes and alerts
No alerts documented for this series yet.
Manuals
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.
Services for Burnham boilers
No — they are two separate current gas steam listings on usboiler.net. The NEW SteamMax spans 75–550 MBH in 12 sizes with a 10-year waterside corrosion warranty (residential, under 300 MBH), while the Independence / Independence PV is the established residential line at up to 82% AFUE in 7 sizes.
No. Both are gas-fired steam boilers with cast-iron heat exchangers and draft-diverter/direct-vent steam configurations — steam systems do not condense, so boilerType is recorded 'non-condensing'.
No official Canadian-sales statement appears on the official pages, so canadianStatus stays 'unknown'. Boilers.ca documents both lines for information and service planning.
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.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.