Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
Both the Burnham Series 2 205E and the Burnham Series 2 206E belong to the Burnham Series 2 line of non-condensing boilers. Published ratings: Burnham Series 2 205E at 138 MBH input, 116 MBH heating capacity and 84% AFUE; Burnham Series 2 206E at 172 MBH input, 145 MBH heating capacity and 84% AFUE. Burnham Series 2 206E lists 34 MBH more input than Burnham Series 2 205E (172 MBH against 138 MBH). Both list the same published AFUE of 84%. Burnham Series 2 206E lists 49 lb more shipping weight than Burnham Series 2 205E (390 lb against 341 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Burnham Series 2 205E | Burnham Series 2 206E |
|---|---|---|
| Input | 138 MBH | 172 MBH |
| DOE heating capacity | 116 MBH | 145 MBH |
| AHRI net water rating | 101 MBH | 126 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 | 4 gal | 5 gal |
| Shipping weight | 341 lb | 390 lb |
| Dimensions | 19 in. wide x 27 in. deep | 22 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 | 5 | 6 |
| Vent diameter | 6" | 6" |
Published ratings: the Burnham Series 2 205E is rated 138 MBH input, 116 MBH heating capacity and 84% AFUE; the Burnham Series 2 206E is rated 172 MBH input, 145 MBH heating capacity and 84% AFUE. Burnham Series 2 206E lists 34 MBH more input than Burnham Series 2 205E (172 MBH against 138 MBH). Both list the same published AFUE of 84%.
Burnham Series 2 206E lists 49 lb more shipping weight than Burnham Series 2 205E (390 lb against 341 lb). The boiler water content differs: the Burnham Series 2 205E lists 4 gal, while the Burnham Series 2 206E lists 5 gal. The dimensions differs: the Burnham Series 2 205E lists 19 in. wide x 27 in. deep, while the Burnham Series 2 206E lists 22 in. wide x 27 in. deep. The cast-iron sections differs: the Burnham Series 2 205E lists 5, while the Burnham Series 2 206E lists 6.
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 205E is a current cast-iron gas water boiler: 138 MBH input for 116 MBH DOE heating capacity and a 101 MBH AHRI net water rating at 84.0% AFUE, with 5 cast-iron sections, a 6" vent, a 1/2" NPT gas connection and 4 gallons of water content at 341 lb shipping.
Burnham
The Burnham Series 2 206E is a current cast-iron gas water boiler: 172 MBH input for 145 MBH DOE heating capacity and a 126 MBH AHRI net water rating at 84.0% AFUE, with 6 cast-iron sections, a 6" vent, a 1/2" NPT gas connection and 5 gallons of water content at 390 lb shipping.
The Burnham Series 2 206E lists 172 MBH, against 138 MBH on the Burnham Series 2 205E, per the cited documentation.
Both list the same AFUE of 84%.
It ships at 390 lb against 341 lb for the Burnham Series 2 205E, 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.