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Viessmann · Vitogas 050 (ECD / ECV / RS)

Viessmann Vitogas 050 ECV-155

The Vitogas 050 ECV-155 is the larger five-section ECV size: 155 MBH input (45 kW), 131 MBH output and 83.1% AFUE.

DiscontinuedHistorically in Canada
Service this modelEstimate a replacement

Key figures

Max input
—
Max CSA output
—
AFUE
83.1 %
Min input
—
Natural gasPropaneHeating-onlyresidential

Input is gas energy consumed; output is heat delivered. Never size from input alone.

Viessmann Vitogas 050 ECV-155 in practice

The ECV-155 fires at 155 MBH (45 kW) input with 131 MBH (38 kW) output at 83.1% AFUE, sharing the five-section, four-burner chassis, 4.3 USG water content and 364 lb (165 kg) weight with the ECV-140.

Dimensions remain 533 x 502 mm at 1030 mm height, with the 3 in. vent collar and 50 psig maximum operating pressure of the range. The ECV prints a uniform 83.1% AFUE across all eight sizes.

Best suited to

  • Existing ECV-155 installations needing printed ratings
  • Residential loads between the ECV-140 and ECV-180
  • Comparing the two five-section ECV sizes

Applicability and support

Model number
ECV-155
Canadian availability
historical
Production status
discontinued
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.

See all service areas

Specifications

Published specifications

Values as published by Viessmann. Units are shown with every value; notes flag conflicting sources or missing figures.

Viessmann Vitogas 050 ECV-155 specifications
SpecificationValueNote
Input
CSA input (natural gas)155 MBH45 kW, per the technical data manual
Output
CSA output / DOE output131 MBH38 kW
Efficiency
Efficiency (AFUE)83.1 %Printed as 83.1% AFUE on all eight ECV sizes.
Venting and air
Vent pipe collar3 inMaximum equivalent vent run 20 ft (6 m) with 3 in. vent pipe.
Physical and connections
Weight (with insulation, burners and packaging)364 lb165 kg
Overall width533 mmPrinted as 21 in
Overall depth502 mm19¾ in
Overall height1,030 mmPrinted as 41½ in
Operating limits and other
FuelNatural gas or propane3.5 in. w.c. manifold pressure NG; 10 in. w.c. propane.
Cast iron sections54 burners.
Boiler water content4.3 USGPer the technical data manual.
Maximum operating pressure50 psig345 kPa.
Boiler supply / return1¼ in. male threadGas supply ½ in. male thread.

Manuals

Alerts documented for this model

None documented yet.

Services

Related parts & service

Frequently asked questions

What is the ECV-155 rated at?

155 MBH (45 kW) input, 131 MBH (38 kW) output and 83.1% AFUE, with five cast-iron sections and four burners.

How does the ECV-155 differ from the ECV-140?

Only the firing rate: 155 vs 140 MBH input and 131 vs 118 MBH output, in the same chassis and weight.

What AFUE does the ECV line print?

83.1% on all eight ECV sizes — the technical data manual prints a uniform figure, unlike the ECD's 83.0-83.7% range.

Questions about the Viessmann Vitogas 050 ECV-155?

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.

Call 778-909-5731Request service

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Sources and verification

Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.

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