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Comparison
Verdict in brief
The ECD-65 and ECD-80 are the two smallest Vitogas 050 ECD boilers and are physically identical: three sections, two burners, 233 lb (106 kg), 2.6 USG of water and the same 340 x 502 x 1035 mm cabinet with a 5 in. vent collar. Only the firing rate differs — 65 vs 80 MBH input — along with the printed AFUE, 83.7% against 83.5%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitogas 050 ECD-65 | Viessmann Vitogas 050 ECD-80 |
|---|---|---|
| CSA input (natural gas) | 65 MBH | 80 MBH |
| CSA output / DOE output | 54 MBH | 66 MBH |
| Efficiency (AFUE) | 83.7 % | 83.5 % |
| Cast iron sections | 3 | 3 |
| Weight (with insulation, burners and packaging) | 233 lb | 233 lb |
| Boiler water content | 2.6 USG | 2.6 USG |
| Overall width | 340 mm | 340 mm |
| Vent pipe collar | 5 in | 5 in |
Both boilers are atmospheric cast-iron sectional units at 50 psig maximum operating pressure in the same 340 x 502 mm (13½ x 19¾ in) footprint with a 1035 mm height. Inputs print at 65 MBH (19 kW) and 80 MBH (23 kW), with outputs of 54 and 66 MBH and the same three sections and two burners.
Weight and water content are identical at 233 lb (106 kg) and 2.6 USG, as are the 1¼ in. supply and return connections, ½ in. gas connection and 5 in. vent collar.
The ECD-65 prints the highest AFUE in the range at 83.7%; the ECD-80 prints 83.5%. Both are chimney-vented with a draft hood and ship with a vent damper for minimum-AFUE compliance.
Viessmann
The Vitogas 050 ECD-65 is the smallest ECD atmospheric cast-iron boiler: 65 MBH input (19 kW), 54 MBH output and 83.7% AFUE in a three-section chassis.
Viessmann
The Vitogas 050 ECD-80 is the second ECD size: 80 MBH input (23 kW), 66 MBH output and 83.5% AFUE in the same compact three-section chassis as the ECD-65.
Yes. Both weigh 233 lb (106 kg) and measure 340 x 502 x 1035 mm with three sections, two burners and a 5 in. vent collar.
The ECD-65 prints 83.7% AFUE against the ECD-80's 83.5%, both with intermittent pilot ignition and a vent damper.
65 MBH (19 kW) input / 54 MBH output on the ECD-65, and 80 MBH (23 kW) / 66 MBH on the ECD-80, with propane ratings printed in the same manual.
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.