Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ECD-140 and ECD-155 share the five-section ECD chassis — four burners, 345 lb (157 kg), 4.3 USG of water and a 7 in. vent collar — and differ in firing rate (140 vs 155 MBH) and printed AFUE (83.5% vs 83.4%). The ECD-155 also prints a slightly higher 129 MBH output against the ECD-140's 116 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Viessmann Vitogas 050 ECD-140 | Viessmann Vitogas 050 ECD-155 |
|---|---|---|
| CSA input (natural gas) | 140 MBH | 155 MBH |
| CSA output / DOE output | 116 MBH | 129 MBH |
| Efficiency (AFUE) | 83.5 % | 83.4 % |
| Cast iron sections | 5 | 5 |
| Weight (with insulation, burners and packaging) | 345 lb | 345 lb |
| Boiler water content | 4.3 USG | 4.3 USG |
| Overall width | 533 mm | 533 mm |
| Vent pipe collar | 7 in | 7 in |
Both models are atmospheric cast-iron boilers at 50 psig maximum operating pressure in the 533 x 502 mm (21 x 19¾ in) cabinet with a 1035 mm height. The ECD-140 fires at 140 MBH (41 kW) input with 116 MBH (34 kW) output; the ECD-155 at 155 MBH (45 kW) with 129 MBH (38 kW) output.
Sections, burners, weight and water content are identical — five sections, four burners, 345 lb (157 kg) and 4.3 USG — as are the 1¼ in. supply/return, ½ in. gas and 7 in. vent collar.
AFUE prints 83.5% on the ECD-140 and 83.4% on the ECD-155. The choice is the calculated load: a home below about 140 MBH keeps the marginally higher printed efficiency of the smaller model.
Viessmann
The Vitogas 050 ECD-140 is a five-section ECD boiler: 140 MBH input (41 kW), 116 MBH output and 83.5% AFUE with a 7 in. vent collar.
Viessmann
The Vitogas 050 ECD-155 is the larger five-section ECD size: 155 MBH input (45 kW), 129 MBH output and 83.4% AFUE.
Yes. Both weigh 345 lb (157 kg) with five sections and a 533 x 502 x 1035 mm cabinet.
140 MBH (41 kW) input / 116 MBH output on the ECD-140, and 155 MBH (45 kW) / 129 MBH on the ECD-155.
The ECD-140 at 83.5%, against 83.4% for the ECD-155 — the figures as printed in the ECD technical data 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.