Oil heaters place their own demands on the chimney. Low-temperature boilers produce exhaust temperatures above those of condensing gas units but still low enough to cause condensation issues. On top of that, the exhaust is more aggressive: sulphur compounds in heating oil form sulphurous acid when they condense, attacking unprotected masonry fast.
DruckZugPro checks whether your chimney fits the oil heater and warns about condensation risk.
Highlights
- Calculation accounts for the sulphur dew point temperature.
- Identifies whether the chimney needs acid-resistant lining.
- Supports both low-temperature and condensing oil boilers.
How it works
- Select your oil boiler from the database or enter performance data.
- Describe your chimney: height, cross-section, material, insulation.
- The result shows draught, temperature profile, and whether condensation is expected.
FAQ
How does this differ from the gas check?
Oil exhaust contains sulphur. The sulphuric acid dew point sits higher than the water dew point. That means acid can form even when no water condensation occurs. DruckZugPro checks both limits.
My oil boiler is being replaced. Do I need to modify the chimney?
Depends on the new boiler. Switching from an old standard boiler to a low-temperature unit lowers the exhaust temperature. The existing chimney may then be oversized. DruckZugPro shows whether a liner to reduce the cross-section is needed.
Is a stainless steel liner sufficient for oil?
For oil the liner must be explicitly rated “W3” (corrosion-resistant for liquid fuels). Not every stainless steel liner meets this requirement. Material choice is separate from the cross-section calculation, but DruckZugPro flags the requirement.