Crown Aruba 4 AWR038E
The Crown Aruba 4 AWR038E is the smallest legacy AWR cast-iron boiler: a fixed 38 MBH input for 32 MBH DOE heating capacity and a 28 MBH net AHRI rating at 83.0% AFUE, Category I natural draft with a mandatory vent damper.
Key figures
- Max input
- 38 MBH
- Max CSA output
- —
- AFUE
- 83 %
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Crown Aruba 4 AWR038E in practice
The AWR038E opens the legacy Crown Aruba 4 line at a fixed 38 MBH input with 32 MBH DOE heating capacity and a 28 MBH net AHRI water rating at 83.0% AFUE, over 2 cast-iron sections (AWR ratings table, Table 2.2, manual P/N 9902339, May 2018). It is a NON-condensing cast-iron boiler with the draft hood built in, vented as Category I into a lined masonry or listed metal chimney with a mandatory vent damper — the flue connector (C) is 4" on this size.
The boiler is built for closed forced-circulation heating systems: supply/return tappings are 1-1/4" (side-relocatable), gas connection follows the manifold with a sediment trap required, and ignition is Honeywell S9361A interrupted ignition with the vent damper (EnviraCOM options listed). Dimension A is 9-3/4" with dimension B 31-1/2" per the ratings table. Above 2,000 ft the boiler needs different main burner orifices, and model suffixes N (NG) or L (LP) follow the basic model (AWR038EN/AWR038EL).
Aruba 4 is legacy — the current catalogue lists Aruba 6 (AWR038C–AWR280C) — so productStatus is 'discontinued'; the manual remains hosted at crownboiler.com/pdfs/Aruba_4/. canadianStatus stays 'unknown'; installation, gas and venting work belongs with a licensed contractor.
Best suited to
- Smaller homes with a chimney-vented load near 38 MBH in an existing AWR installation
- Owners documenting the legacy Aruba 4 generation against the current Aruba 6
- Contractors researching cast-iron natural-draft replacements in the 38 MBH class
Applicability and support
- Model number
- AWR038E
- Canadian availability
- unknown
- Production status
- discontinued
- 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 Crown Boiler Co.. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 38 MBH | Fixed input (no modulation) per the AWR space-heating ratings table (Table 2.2); NG/LP suffix added to the model (e.g. AWR210EN / AWR210EL). |
| Output | ||
| DOE heating capacity | 32 MBH | Heating capacity per the AWR ratings table (Table 2.2). |
| Net AHRI water rating | 28 MBH | Net AHRI water rating based on a piping and pickup allowance of 1.15 per the ratings table. |
| Efficiency | ||
| Efficiency (AFUE) | 83 % | AFUE per the AWR ratings table (Table 2.2). |
| Domestic hot water | ||
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | |
| Venting and air | ||
| Venting | Category I natural draft — draft hood built into the boiler; lined masonry or listed metal chimney | Vent damper installation is mandatory on all AWR boilers; flue connector size (C) 4" per the ratings table. Boilers above 2,000 ft need different main burner orifices. |
| Physical and connections | ||
| Cast-iron sections | 2 | Number of sections per the AWR ratings table. |
| Dimensions (A × B) | 9-3/4" × 31-1/2" | Dimension A and dimension B per the AWR ratings table (Table 2.2); flue connector (C) is 4". |
| Supply/return tappings | 1-1/4" | Supply and return tappings 1-1/4" (side-relocatable) per the installation manual. |
| Operating limits and other | ||
| Ignition and controls | Honeywell S9361A interrupted ignition with vent damper | EnviraCOM options listed in the installation manual; the control shows discrete Err codes. |
| Fuel | Natural gas or propane | Add suffix N for natural gas or L for propane to the basic boiler model (e.g. AWR210EN, AWR210EL). |
Manuals
Frequently asked questions
What are the AWR038E's ratings?
38 MBH fixed input, 32 MBH DOE heating capacity, a 28 MBH net AHRI water rating and 83.0% AFUE per the AWR ratings table.
Is the Aruba 4 condensing?
No — the AWR series is a cast-iron, Category I natural-draft boiler with a built-in draft hood and a mandatory vent damper, vented into a lined masonry or listed metal chimney.
Is the Aruba 4 still made?
No. The current line is Aruba 6 (AWR038C–AWR280C); the Aruba 4 (AWR038E–AWR280E) is legacy with productStatus 'discontinued'.
Questions about the Crown Aruba 4 AWR038E?
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
Sources and verification
- AWR Series Gas-Fired Natural Draft Hot Water Boilers — Installation Manual, P/N 9902339 (May 2018) (PDF) · 9902339 · accessed September 8, 2026
- Velocity Boiler Works — Aruba 6 (AWR) product page (current Aruba line) · accessed September 8, 2026
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.