Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Crown Bermuda BSI138 and Crown Bermuda BSI172 are both non-condensing boilers in the Crown Boiler Co. Bermuda (legacy) line. The Crown Bermuda BSI138 is documented at 138 MBH input, 113 MBH DOE heating capacity and 82% AFUE, while the Crown Bermuda BSI172 is documented at 172 MBH input, 142 MBH DOE heating capacity and 82.1% AFUE. Crown Bermuda BSI172 lists 34 MBH more input than Crown Bermuda BSI138 (172 MBH against 138 MBH). Crown Bermuda BSI172 carries the higher published AFUE at 82.1%, against 82%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Crown Bermuda BSI138 | Crown Bermuda BSI172 |
|---|---|---|
| Input | 138 MBH | 172 MBH |
| Efficiency (AFUE) | 82 % | 82.1 % |
| 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 |
| Boiler water volume | 7.9 gal | 9.3 gal |
| Dimensions (W × D × H) | 19-1/4" × 28" × 40-7/16" | 22-1/2" × 28" × 40-7/16" |
| Venting | Natural draft into an approved chimney | Natural draft into an approved chimney |
| Fuel | Natural gas or LP gas | Natural gas or LP gas |
| DOE heating capacity | 113 MBH | 142 MBH |
| AHRI net steam rating | 85 MBH | 107 MBH |
| Cast-iron sections | 5 | 6 |
| Vent size | 6" | 6" |
| Approximate shipping weight | 485 lb | 555 lb |
Published ratings: the Crown Bermuda BSI138 is rated 138 MBH input, 113 MBH DOE heating capacity and 82% AFUE; the Crown Bermuda BSI172 is rated 172 MBH input, 142 MBH DOE heating capacity and 82.1% AFUE. Crown Bermuda BSI172 lists 34 MBH more input than Crown Bermuda BSI138 (172 MBH against 138 MBH). Crown Bermuda BSI172 carries the higher published AFUE at 82.1%, against 82%.
The boiler water content differs: the Crown Bermuda BSI138 lists 7.9 gal, while the Crown Bermuda BSI172 lists 9.3 gal. The dimensions differs: the Crown Bermuda BSI138 lists 19-1/4" × 28" × 40-7/16", while the Crown Bermuda BSI172 lists 22-1/2" × 28" × 40-7/16". The cast-iron sections differs: the Crown Bermuda BSI138 lists 5, while the Crown Bermuda BSI172 lists 6.
Both records print the same domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), venting (Natural draft into an approved chimney), fuel (Natural gas or LP gas) and vent size (6"), per the cited sources.
Crown Boiler Co.
The Crown Bermuda BSI138 is a 138 MBH mid size of the legacy cast-iron gas steam line: 138 MBH input, 113 MBH heating capacity and a 85 MBH AHRI net steam rating (354 sq ft) at 82% AFUE, over 5 cast-iron sections with 7.9 gallons of boiler water.
Crown Boiler Co.
The Crown Bermuda BSI172 is a 172 MBH mid-large size of the legacy cast-iron gas steam line: 172 MBH input, 142 MBH heating capacity and a 107 MBH AHRI net steam rating (446 sq ft) at 82.1% AFUE, over 6 cast-iron sections with 9.3 gallons of boiler water.
The Crown Bermuda BSI172 lists 172 MBH, against 138 MBH on the Crown Bermuda BSI138, per the cited documentation.
The Crown Bermuda BSI172 carries the higher published AFUE at 82.1%, against 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.