Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The AWR070E and AWR105E are the second and third legacy Aruba 4 sizes — identical NON-condensing Category I design with built-in draft hood, mandatory vent damper and 1-1/4" tappings. The 105E fires a fixed 105 MBH against 70 MBH (DOE 87 vs 58 MBH, net AHRI 76 vs 50 MBH) at the line's highest 83.7% AFUE, stepping to 4 sections and a 5" flue connector from 3 sections and 4".
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Crown Aruba 4 AWR070E | Crown Aruba 4 AWR105E |
|---|---|---|
| Input | 70 MBH | 105 MBH |
| DOE heating capacity | 58 MBH | 87 MBH |
| Net AHRI water rating | 50 MBH | 76 MBH |
| Efficiency (AFUE) | 83.5 % | 83.7 % |
| Cast-iron sections | 3 | 4 |
| Dimensions (A × B) | 12-7/8" × 31-1/2" | 15-3/8" × 31-1/2" |
| Venting | Category I natural draft — draft hood built into the boiler; lined masonry or listed metal chimney | Category I natural draft — draft hood built into the boiler; lined masonry or listed metal chimney |
| Supply/return tappings | 1-1/4" | 1-1/4" |
| Ignition and controls | Honeywell S9361A interrupted ignition with vent damper | Honeywell S9361A interrupted ignition with vent damper |
| Fuel | Natural gas or propane | Natural gas or propane |
| 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 |
Both AWR models are cast-iron, NON-condensing, Category I natural-draft boilers with the draft hood built in, a mandatory vent damper, 1-1/4" (side-relocatable) supply/return tappings and Honeywell S9361A interrupted ignition with EnviraCOM options.
The AWR105E raises the fixed input from 70 to 105 MBH across 4 cast-iron sections (the 070E uses 3), printing 87 MBH DOE heating capacity and a 76 MBH net AHRI water rating against 58 and 50 MBH — and its 83.7% AFUE is the highest rating in the entire AWR038E–AWR280E table.
The flue connector (C) grows from 4" on the 070E to 5" on the 105E, and dimension A from 12-7/8" to 15-3/8" (both stand at dimension B 31-1/2"). Above 2,000 ft both need different main burner orifices, and both take NG/LP suffix codes (AWR070EN/EL, AWR105EN/EL).
Crown Boiler Co.
The Crown Aruba 4 AWR070E fires a fixed 70 MBH for 58 MBH DOE heating capacity and a 50 MBH net AHRI rating at 83.5% AFUE across 3 cast-iron sections — the second size of the legacy Category I AWR line.
Crown Boiler Co.
The Crown Aruba 4 AWR105E fires a fixed 105 MBH for 87 MBH DOE heating capacity and a 76 MBH net AHRI rating at the line's highest 83.7% AFUE across 4 cast-iron sections, with a 5" flue connector.
The AWR105E at 83.7% AFUE — the highest rating in the Aruba 4 table — against the AWR070E's 83.5%.
35 MBH of fixed input (105 vs 70), 29 MBH of DOE capacity (87 vs 58), 26 MBH of net AHRI (76 vs 50), one more section and a 5" flue connector instead of 4".
No — the Aruba 4 AWR series is non-condensing cast iron, vented Category I into a lined masonry or listed metal chimney with a mandatory vent damper.
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 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.