De Dietrich GT 228A
The De Dietrich GT 228A is a 8-section eutectic cast-iron 3-pass commercial boiler rated 361 MBH gas input / 307 MBH output (2.5 GPH on oil) at a printed 85.2% gas efficiency (oil +3 points), with R1 1/2 supply and return connections.
Key figures
- Max input
- 361 MBH
- Max CSA output
- 307 MBH
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
De Dietrich GT 228A in practice
The GT 228A is the 8-section size of the GT 220A series, a eutectic cast-iron three-pass low-temperature boiler documented in the GT 220A brochure. The printed table gives 361 MBH CSA gas input, 307 MBH CSA output, a 2.5 GPH No. 2 fuel oil input and a dry weight of 827 lb. The boiler is rated ASME IV Class 30 at 60 psi water with an 86–194 °F operating range and 230 °F maximum water temperature.
Supply and return connections are R1 1/2 and the vent connection is 7". The brochure's efficiency note states '85.2% efficiency is the published efficiency (oil is +3%)' — there is no per-model AFUE column for this line. DDR Americas Inc. (Cambridge, Ontario) is the North American arm and the submittal for this line is issued on its letterhead.
Best suited to
- Commercial buildings whose calculated load fits 307 MBH output
- Low-temperature hydronic systems with gas, oil or dual-fuel firing
- Plants replacing a boiler of similar ${r.sections}-section physical size
Applicability and support
- Model number
- GT 228A
- Canadian availability
- available
- Production status
- current
- 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 De Dietrich. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| CSA gas input | 361 MBH | Printed in the GT 220A brochure technical specifications. |
| CSA No. 2 fuel oil input | 2.5 GPH | Printed in the GT 220A brochure technical specifications. |
| Output | ||
| CSA output (gas-oil) | 307 MBH | Printed in the GT 220A brochure; outputs are rounded in the source. |
| Efficiency | ||
| Published efficiency (as printed) | 85.2% gas (oil +3 points) | Brochure note: '85.2% efficiency is the published efficiency (oil is +3%)'. No per-model AFUE column is printed for this line. |
| Venting and air | ||
| Boiler vent connection | 7 in | Printed in the GT 220A brochure; gas-vent categories I, II, III or IV. |
| Physical and connections | ||
| Cast-iron sections | 8 | Printed in the GT 220A brochure dimensions table. |
| Heating supply / return | R1 1/2 outlet / R1 1/2 return | Printed in the GT 220A brochure dimensions table (items 1 and 2). |
| Weight (dry) | 827 lb | Printed in the GT 220A brochure. |
| MAWP (water) | ASME IV Rating Class 30 (60 psi) | Printed in the GT 220A brochure. |
| Operating limits and other | ||
| Operating temperature range | 86–194 °F | Printed in the GT 220A brochure; max water temp 230 °F. |
| Fuel | Natural gas or propane; No. 2 oil firing documented | The GT 220A brochure describes 'propane firing' and the GT-series pages list gas/oil/dual-fuel options; No. 2 oil input is printed per model. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What is the output of the GT 228A?
The GT 220A brochure prints 361 MBH CSA gas input and 307 MBH CSA output for this size, with a 2.5 GPH No. 2 oil input.
What efficiency does the GT 228A have?
The brochure prints 85.2% published efficiency on gas with oil +3 points. No per-model AFUE column is printed for the GT 220A line.
What connections does the GT 228A use?
The brochure's dimensions table prints R1 1/2 heating outlet and return connections and a 7" boiler vent connection for this size.
Questions about the De Dietrich GT 228A?
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
- De Dietrich GT 224A vs GT 228AComparison
- De Dietrich GT 123ASame series
- De Dietrich GT 124ASame series
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- De Dietrich GT 126ASame series
- De Dietrich GT 224ASame series
- De Dietrich GT 225ASame series
- De Dietrich GT 226ASame series
- De Dietrich GT 227ASame series
- De Dietrich GT 334ASame series
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- De Dietrich GT 336ASame series
- De Dietrich GT 337ASame series
- De Dietrich GT 338ASame series
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- GT Series series hub
- Buying guide
Sources and verification
- De Dietrich NA — GT-120A product page · accessed September 9, 2026
- De Dietrich NA — GT-220A product page · accessed September 9, 2026
- De Dietrich NA — GT-330A product page · accessed September 9, 2026
- DDR Americas — Cambridge, Ontario company page · accessed September 9, 2026
- De Dietrich — GT 220A brochure (E815993) technical specifications · accessed September 9, 2026
- De Dietrich — GT-220A Installation & Operation Manual (2-27-2018) · accessed September 9, 2026
- De Dietrich — GT-220A engineering submittal (GT 224A to 228A) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.