Desalination & Membrane Water Treatment Equipment worked example

Warranty Reserve at 58% expected claim rate over warranty term: a worked example in desalination & membrane water treatment equipment

This worked example runs the warranty reserve numbers for a tougher week than the baseline: 58% expected claim rate over warranty term instead of the typical 80%. Estimate warranty reserve for membrane systems, skids, pumps, pressure vessels, controls, cartridges, or field service obligations after shipment or startup.

The inputs for this scenario

  • Systems or components under warranty: 100 units (held at the documented default)
  • Average repair cost per warranty claim: 45 $ / unit (held at the documented default)
  • Expected claim rate over warranty term: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed warranty program overhead: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Expected variable warranty reserve = systems or components under warranty × expected warranty cost per unit × expected warranty occurrence share.
  • Total warranty reserve works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Warranty reserve per covered unit works out to 28.6 $ / piece at these inputs.
  • Expected variable warranty reserve works out to 2,610 $ at these inputs.
  • Fixed warranty program reserve works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected claim rate over warranty term sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • Use it at project closeout or shipment to book the warranty liability, and revisit it as field-failure data accumulates over the warranty term. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Total warranty reserve: 2,860 $ (headline result)
  • Warranty reserve per covered unit: 28.6 $ / piece
  • Expected variable warranty reserve: 2,610 $
  • Fixed warranty program reserve: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Warranty Reserve calculator, set expected claim rate over warranty term to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.