Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Burnham Series 2 203E and Burnham Series 2 204E are both non-condensing boilers in the Burnham Series 2 line. Published ratings: Burnham Series 2 203E at 69 MBH input, 58 MBH heating capacity and 84% AFUE; Burnham Series 2 204E at 103 MBH input, 87 MBH heating capacity and 84% AFUE. Burnham Series 2 204E lists 34 MBH more input than Burnham Series 2 203E (103 MBH against 69 MBH). Both list the same published AFUE of 84%. Burnham Series 2 204E lists 51 lb more shipping weight than Burnham Series 2 203E (292 lb against 241 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Burnham Series 2 203E | Burnham Series 2 204E |
|---|---|---|
| Input | 69 MBH | 103 MBH |
| DOE heating capacity | 58 MBH | 87 MBH |
| AHRI net water rating | 50 MBH | 76 MBH |
| Efficiency (AFUE) | 84 % | 84 % |
| 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 |
| Water content | 2 gal | 3 gal |
| Shipping weight | 241 lb | 292 lb |
| Dimensions | 14 in. wide x 27 in. deep | 16 in. wide x 27 in. deep |
| Gas connection | 1/2" NPT | 1/2" NPT |
| Fuel | Natural gas or propane | Natural gas or propane |
| Cast-iron sections | 3 | 4 |
| Vent diameter | 4" | 5" |
Published ratings: the Burnham Series 2 203E is rated 69 MBH input, 58 MBH heating capacity and 84% AFUE; the Burnham Series 2 204E is rated 103 MBH input, 87 MBH heating capacity and 84% AFUE. Burnham Series 2 204E lists 34 MBH more input than Burnham Series 2 203E (103 MBH against 69 MBH). Both list the same published AFUE of 84%.
Burnham Series 2 204E lists 51 lb more shipping weight than Burnham Series 2 203E (292 lb against 241 lb). The boiler water content differs: the Burnham Series 2 203E lists 2 gal, while the Burnham Series 2 204E lists 3 gal. The dimensions differs: the Burnham Series 2 203E lists 14 in. wide x 27 in. deep, while the Burnham Series 2 204E lists 16 in. wide x 27 in. deep. The cast-iron sections differs: the Burnham Series 2 203E lists 3, while the Burnham Series 2 204E lists 4.
Both records print the same AFUE (84%), domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), gas connection (1/2" NPT) and fuel (Natural gas or propane), per the cited sources.
Burnham
The Burnham Series 2 203E is a current cast-iron gas water boiler: 69 MBH input for 58 MBH DOE heating capacity and a 50 MBH AHRI net water rating at 84.0% AFUE, with 3 cast-iron sections, a 4" vent, a 1/2" NPT gas connection and 2 gallons of water content at 241 lb shipping.
Burnham
The Burnham Series 2 204E is a current cast-iron gas water boiler: 103 MBH input for 87 MBH DOE heating capacity and a 76 MBH AHRI net water rating at 84.0% AFUE, with 4 cast-iron sections, a 5" vent, a 1/2" NPT gas connection and 3 gallons of water content at 292 lb shipping.
The Burnham Series 2 204E lists 103 MBH, against 69 MBH on the Burnham Series 2 203E, per the cited documentation.
Both list the same AFUE of 84%.
It ships at 292 lb against 241 lb for the Burnham Series 2 203E, per the cited sources.
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.