A tankless water-heater installation can change more than the appliance itself. Gas-line capacity, venting, condensate, electrical requirements and equipment location can all affect the permit package.
This guide helps you describe the project accurately. It does not replace a City determination about whether a permit, plan review, inspection or professional document is required.
The exact permit requirement depends on the work, property and current City rules. Use the scope questions on this page and confirm the requirement with the responsible building department.
This guide links to the configured Irvine water heater workflow because it is the closest supported project category. If your exact scope requires additional forms, plans or review, the City remains the authority.