Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The AWR210E and AWR245E are the seventh and eighth legacy Aruba 4 sizes, both NON-condensing Category I cast-iron boilers at 83.4% AFUE: the 245E fires a fixed 245 MBH against 210 MBH (DOE 205 vs 175 MBH, net AHRI 178 vs 152 MBH) over 8 sections, growing dimension A from 24-5/8" to 27-5/8" and the flue connector from 7" to 8".
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Crown Aruba 4 AWR210E | Crown Aruba 4 AWR245E |
|---|---|---|
| Input | 210 MBH | 245 MBH |
| DOE heating capacity | 175 MBH | 205 MBH |
| Net AHRI water rating | 152 MBH | 178 MBH |
| Efficiency (AFUE) | 83.4 % | 83.4 % |
| Cast-iron sections | 7 | 8 |
| Dimensions (A × B) | 24-5/8" × 33-1/2" | 27-5/8" × 33-1/2" |
| 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 are cast-iron, NON-condensing, Category I natural-draft Aruba 4 boilers with built-in draft hoods, mandatory vent dampers, 1-1/4" side-relocatable tappings and Honeywell S9361A interrupted ignition — both share the 33-1/2" dimension B jacket; the 245E carries the alcove front-clearance rating of the AWR245-280 group while the 210E belongs to the AWR038-210 group's 6" front-clearance rating.
The AWR245E raises the fixed input from 210 to 245 MBH across 8 cast-iron sections (7 on the 210E), printing 205 MBH DOE heating capacity and a 178 MBH net AHRI water rating against 175 and 152 MBH, at the same 83.4% AFUE.
The flue connector (C) steps from 7" on the 210E to 8" on the 245E, and dimension A grows from 24-5/8" to 27-5/8". Above 2,000 ft both need different main burner orifices; NG/LP suffix codes complete the model numbers (AWR210EN/EL, AWR245EN/EL).
Crown Boiler Co.
The Crown Aruba 4 AWR210E fires a fixed 210 MBH for 175 MBH DOE heating capacity and a 152 MBH net AHRI rating at 83.4% AFUE across 7 cast-iron sections, with a 7" flue connector and the taller 33-1/2" dimension B.
Crown Boiler Co.
The Crown Aruba 4 AWR245E fires a fixed 245 MBH for 205 MBH DOE heating capacity and a 178 MBH net AHRI rating at 83.4% AFUE across 8 cast-iron sections, with the 8" flue connector and alcove clearance group.
35 MBH of fixed input (245 vs 210), 30 MBH of DOE capacity (205 vs 175), 26 MBH of net AHRI (178 vs 152), one more section and an 8" flue connector against 7".
The AWR245E is the second-largest — the AWR280E (280 MBH, 9 sections) tops the line.
The manual's locating section groups clearances by size: the AWR038E–210E boilers allow a 6" front clearance, while the AWR245E/280E carry an alcove front-clearance rating.
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.