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Water-heater replacement before startup checklist

A pre-startup residential water-heater checklist for correct fuel and capacity, location and clearances, pan and drainage, thermal expansion, temperature and pressure relief discharge, venting or combustion air, electrical or gas connection, seismic or structural support, piping, shutoffs, permits, and leak readiness.

6 items to check

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Water-heater type, capacity, location, support, and clearances match approval

Critical item

The installed unit should suit the fuel, service, space, structural support, environmental exposure, and service access.

Cold inlet, hot outlet, shutoff, unions, dielectric or compatible transitions, and recirculation are complete

Critical item

Piping should be supported, identified, serviceable, and compatible with the selected materials and heater.

Temperature-pressure relief and thermal-expansion control are correctly installed

Critical item

Relief discharge and expansion control should follow adopted requirements and product instructions without isolation or obstruction.

Drain pan, leakage path, condensate, and floor protection are complete

Critical item

Leak or condensate management should protect finished areas and terminate appropriately.

Gas, venting and combustion air or electrical supply and disconnect are installation-ready

Critical item

Energy connections should match the nameplate, listing, and adopted fuel-gas or electrical requirements.

Filling, purging, leak testing, startup, temperature setting, and permit inspection are documented

Critical item

The heater should not be energized dry and should pass required operational and official checks.

Use after a tank or tankless water heater is installed but before normal owner use. This page verifies visible readiness; qualified trades must perform combustion, gas, electrical, and pressure testing. Do not enter contaminated, structurally unsafe, energized, confined, or oxygen-deficient areas; do not open pressurized systems or handle sewage. Use qualified plumbing, electrical, remediation, environmental, and structural professionals where applicable.

Reference standards

  • Approved plumbing or restoration scope, adopted state and local plumbing, mechanical, electrical, building, and health requirements, permit and inspection conditions, authority having jurisdiction requirements, water-utility rules, and exact equipment, piping, drainage, waterproofing, and drying-system manufacturer instructions
  • Exact water-heater, venting, relief valve, expansion control, drain pan, gas connector, electrical, recirculation, and condensate instructions

    • Tools

  • Written scope, fixture or equipment data, piping plan, permit, inspection records, and authorized changes
  • Camera, flashlight, dry towels, owner-safe water observations, and qualified trade test records
  • Pressure, temperature, drainage, sewer-camera, moisture, drying, and commissioning records produced with suitable instruments

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