National Home Inspector Examination Preparation2023 Content OutlineRegister for NHIE
Domain 1

Plumbing & Fuel Distribution

Supply, fixtures, DWV, water heaters, fuel piping, storage, sump pumps, ejectors, cross-connections, pressure, and safety devices.

Supply and fixtures

Identify piping, functional flow, leaks, cross-connections, support, corrosion, and obsolete materials.

Drain, waste, and vent

Understand trap seals, venting, slope, leakage, private disposal limits, and signs of restriction.

Water heating and fuel

Inspect TPR components, venting, combustion, restraints where applicable, fuel shutoffs, leaks, and protective barriers.

Common exam traps

  • Failing to identify a capped TPR discharge
  • Ignoring cross-connections
  • Diagnosing concealed sewer conditions without evidence
Module progressNot completed