Water Heater Inspection Checklist: What to Check, What to Call Out, and Defensible Report Language
Water heaters are one of those “quiet” systems: most days, nobody thinks about them — until they fail and there’s water damage, a no-hot-water emergency, or a safety incident.
As an inspector, your job is to document what you can observe, identify common safety concerns, and recommend the right next step without overclaiming. This checklist is built for field use.
Important
This is a visual, non-invasive checklist. Follow your SOP and local standards. Do not disassemble components, remove burner covers, or operate shutoff valves if that’s outside your scope.
1) Identify the Unit (So Your Notes Stay Specific)
- Fuel type: gas / electric / heat pump / tankless
- Approximate capacity: often on label (e.g., 40 / 50 gallons)
- Location: garage / attic / closet / exterior / mechanical room
- Age: note from manufacturer label or serial format if visible
Note
In your report, write what you observed (“data plate indicates…”) instead of guessing.
2) Look for Leakage and Damage (Fast Wins)
- Active leakage at tank, fittings, or piping connections
- Rust staining at bottom pan, base, or jacket
- Evidence of past leaking (corrosion, mineral staining, water marks)
- Condition of surrounding materials (water damage, microbial growth-like staining)
- Clearance issues: storage piled against the unit, blocked access
3) TPR (Temperature/Pressure Relief) Valve Basics
The TPR valve is a safety device — and it’s a common defect area.
Checklist:
- TPR valve present on tank (usually side/top)
- Discharge pipe present and connected
- Discharge terminates at a safe location: typically within a few inches of floor, not threaded/capped, not into a crawlspace, not into a pan unless approved in your jurisdiction
- No visible leakage at the valve or discharge pipe
Important
Do not lift the TPR test lever during a home inspection unless your SOP explicitly allows it. A TPR can fail to reseat and start leaking.
4) Gas Units: Venting & Combustion Safety (High Priority)
If it’s a gas water heater, document the obvious safety indicators:
- Vent connector appears secured and properly sloped upward toward the vent
- No visible corrosion/perforation on vent connector
- Draft hood present (at many atmospheric units) and appears properly seated
- Combustion air openings not blocked (where applicable)
- No obvious backdrafting indicators around draft hood area (soot staining, heavy corrosion)
- Gas shutoff valve present and accessible
- Flexible connector condition (visible damage, kinks, corrosion)
Note
When you suspect venting/drafting concerns, recommend evaluation by a qualified HVAC/plumbing contractor rather than diagnosing the cause.
5) Electric Units: Wiring and Visible Safety Concerns
- Access panels appear present and secured
- No visible scorching, melted insulation, or damaged conductors
- Relief valve/discharge pipe checks still apply
6) Installation / Support Details That Matter
- Pan present when installed above finished spaces (document presence/absence)
- Drain line present from pan (if visible)
- Seismic strapping present where common/required (document presence/absence; avoid “required” language unless your SOP says so)
- Clearance to combustibles (note any obvious unsafe contact)
- Exhaust vent clearance (gas units): no combustible contact
7) Photo Set (What to Capture)
- Data plate / model info
- Wide shot showing location/context
- TPR valve + discharge termination
- Vent connector (gas) + draft hood area
- Any leakage/corrosion evidence
- Pan + drain (if present) and surrounding water damage
Report Language Templates
Leakage observed
“Leakage observed at the water heater at ____ . Recommend evaluation and repair/replacement by a qualified plumbing contractor. Due to the potential for concealed damage, monitor nearby finishes/materials for additional evidence of moisture intrusion.”
TPR discharge concerns
“The water heater TPR discharge piping configuration appears improper/unsafe (____). The TPR is a critical safety device. Recommend correction by a qualified plumbing contractor.”
Suspected venting/drafting concern (gas)
“Conditions observed at the gas water heater venting system may indicate venting/drafting concerns (____). Recommend evaluation and correction by a qualified contractor prior to close of escrow.”
Limited visibility / access
“Water heater evaluation was limited due to ____ . Components not visible could not be evaluated. Recommend further evaluation as needed.”
Where ReportWalk Helps
Water heater findings often turn into messy “I saw rust” notes that don’t stand up later. ReportWalk helps you dictate a clean, defensible finding (location → observation → implication → recommendation) while you’re standing in front of the unit — and attach the exact photos that back it up.
