How to Assess Equipment After Floodwater

Why this matters

After a flood the customer's first question is "can you get it running?", and the honest answer for a lot of what sat in the water is no, it gets replaced. Gas controls, safety controls and many electrical components are not built to be dried and trusted, and the manufacturers say so in writing. The tech who dries a gas valve with a heat gun and relights the water heater has made the house worse than the flood did, because now a compromised safety control is running unattended. This card is the assessment sequence: what gets touched in what order, what gets replaced by rule, what gets a judgment, and what goes into the record the adjuster will read.

Floodwater itself is a contaminant and a body hazard; the exposure controls are owned elsewhere and apply from the first step. See related: Floodwater Exposure for Any Trade. The standing procedure a shop runs after an event, including scheduling and the callback list, is the post-event SOP.

The steps

1. Confirm the power is off from outside the wet area before anyone enters. If water reached the panel, any receptacle, or any equipment, the circuit feeding it may still be live, and standing water turns a fault into a path through a person. Have the utility pull the meter or confirm the main is open at a disconnect you can reach without stepping into water. If the only main is in the flooded basement, nobody walks down to it; the utility disconnects at the meter. Skip it and the first person down the stairs tests the circuit with their legs.

2. Confirm the gas situation before anyone works near appliances. If anyone smells gas, everyone leaves the building, no switches touched, no lights, no phone used inside, and the call to the gas utility is made from outside. Floodwater can float an appliance, shift it, and pull a connector or a vent apart, so on a dry nose the meter valve is still closed until the assessment is done. Skip it and a moved water heater leaking at a stretched connector sits in a closed basement for the whole visit.

3. Do not energize anything to "see if it works." Flipping a breaker on a wet circuit, plugging in a submerged dehumidifier or pushing the reset on a furnace are all tests that can arc inside a contaminated control or start a motor with water in its windings. Nothing gets power until steps 4 to 7 say it may. Skip it and the one test destroys the evidence of what was wet, and on a bad day starts a fire inside a closed cabinet.

4. Mark and measure the high-water line on every piece of equipment. Floodwater leaves a line of silt, a tide mark on painted metal and a stain on duct wrap. Measure it in inches from the floor, then measure the height of the components that matter on each appliance: gas control, burner, igniter, control board, blower motor, compressor terminals, electrical box. The decision for each component is whether it was below the line, and you cannot make it from a glance. Skip it and the report says "flood damage" with nothing an adjuster or the next tech can check.

5. Replace any gas control, gas valve, burner assembly or flame safety device that was under water. Gas appliance installation manuals carry a warning in near-identical words across manufacturers: do not use the appliance if any part has been under water, and have a qualified technician replace any part of the control system and any gas control that was submerged. That is the manufacturer's instruction, it rides along with the appliance's listing, and the shop that overrides it owns the result. Silt inside a regulator or a pilot assembly cannot be seen and cannot be flushed out with confidence. Where the controls are a large share of the appliance and the cabinet, insulation and venting were also in the water, replacement of the whole appliance is usually the sound quote. Skip it and a valve that sticks open or a flame sensor that reads a flame that is not there is now the safety device.

6. Treat submerged electrical equipment as replace-by-default, and send the panel and wiring to an electrician. NEMA publishes a guide, Evaluating Water-Damaged Electrical Equipment, that lists the categories manufacturers want replaced after submersion: circuit breakers, fuses, GFCI and AFCI devices, receptacles, switches, wiring devices, and cable rated only for dry locations, among others. A few items, such as some conduit and metal enclosures, can be cleaned and kept by a qualified person. A field-service tech's job here is to flag, not to clear: note which devices were below the line, and say in writing that the electrical system needs an electrician's evaluation before re-energizing. Many utilities will not reset a meter after a flood until a local inspection signs off; check with yours. Skip it and a breaker with silt in its trip mechanism carries load it can no longer interrupt.

7. Sort the rest by what the component is made of and whether it can be cleaned. Motors, compressors and boards that were submerged generally get replaced; a compressor whose terminals or electrical box went under is a manufacturer's call, and most will not stand behind it. Fiberglass duct board, flex duct and duct wrap that took floodwater are porous and contaminated, and they come out. Sheet-metal duct can be cleaned and sanitized if it is sound. An outdoor unit that sat in salt water has a short future even where it tests well today, because the chloride keeps working on the coil and the connections. Skip it and the duct system blows dried silt and whatever the water carried through the house for a season.

8. Build the claim record while you are standing there. The adjuster will see the equipment after it has been hauled out or after it has been replaced, and the record is what carries the visit. Use the format in the next section.

9. Restart only what passed, and only after the checks that make it safe. Before any gas appliance is relit: the electrician has cleared the circuits feeding it, a leak test with an approved solution or a gas detector has been done on every connection the water could have moved, and the vent connector is checked for separation or blockage by debris. After lighting, run a combustion and draft check and stand there with a personal CO monitor on, because a flood can shift a vent enough to spill flue gas into the space. Before any electrical equipment is re-energized, the electrician's sign-off is in hand, the equipment's own disconnect is open, and you close it standing to the side of the cabinet, not in front of the door. Skip it and the restart is the moment the visit hurts someone.

The record the claim needs

Write one block per appliance. Insurers and adjusters ask for the same things: what it was, how high the water got on it, what was under the line, and why each part is a replace rather than a repair.

FLOOD ASSESSMENT - EQUIPMENT RECORD
Site water line on wall .......... 30 in above slab
Water source ..................... sewer backup (category 3)

Unit ............ gas furnace, upflow, basement
Nameplate ....... model / serial photographed
Water line on cabinet ............ 29 in
Gas valve ....... 22 in   BELOW   replace (mfr warning)
Burners/igniter . 20 in   BELOW   replace (mfr warning)
Blower motor .... 9 in    BELOW   replace
Control board ... 34 in   above   humidity exposed, noted
Recommendation .. replace appliance; controls, blower
                  and insulation all below line
Photos .......... 6 (line, nameplate, each component)
Power/gas state . main open at meter; gas off at meter

Photographs that carry: the water line on the wall with a tape measure in frame, the water line on each cabinet, each nameplate readable, and each component that drives a replace call with the line visible above it. Note the water source; sewage backup and clean rising water are treated differently by policies and by cleaning protocols. Record the time, the person present and the utility state.

A note on the federal flood policy. Under the standard National Flood Insurance Program policy, basement coverage is limited but does reach certain equipment, including furnaces, water heaters, central air units and electrical panels, and the policyholder owes the insurer a signed proof of loss on a deadline the policy sets. Coverage questions are the customer's and their agent's; your job is a record good enough that the answer does not depend on your memory. This is not insurance advice.

Worked example: one basement, four appliances

A finished basement took sewage from a backup during a street flood. The tide line on the drywall is at 30 in. The customer wants the heat back on tonight. Heights are as measured on this site.

Furnace. Water line on the cabinet at 29 in, a little under the wall line because the furnace sits on a 1 in pad. Gas valve at 22 in, burners and igniter at 20 in, blower at 9 in, board at 34 in. Three of four control-relevant components are below the line, two of them gas controls under the manufacturer's replace instruction. Quote: replace. The board being dry does not change it; a furnace with a new valve, new burners, new blower and a board that spent a day in a saturated cabinet is a rebuild with a short warranty.

Water heater. Gas, atmospheric vent. Water line at 29 in on a 50-gallon tank; the gas control sits at 11 in, so it was under by 18 in. Replace. Note in the record that the vent connector has pulled out of the draft hood by about 1 in, because the tank floated slightly and settled. That observation is the reason step 9 exists.

Electrical. Panel bottom at 54 in, so the panel itself was 24 in above the line (54 minus 30). Basement receptacles at 16 in were submerged, and two circuits run to them. The record flags those circuits and the receptacles for the electrician and says the panel was above the line but in a saturated room. The tech does not decide whether the panel stays.

Outdoor condenser. Different water: the yard took about 14 in of street runoff. The unit is 36 in tall on a 4 in pad, so the water reached 10 in up the cabinet (14 minus 4). The compressor terminal box sits at 8 in on the cabinet, so it was under by 2 in. That goes to the manufacturer before any power is restored, with photos; it is not cleared by drying.

Tonight's heat. Nothing in this basement is restarted today. The customer gets the written record, a recommendation for temporary electric heat on an undamaged upstairs circuit only after the electrician clears it, and a schedule.

What changes the answer. If the water line had stopped at 6 in, the furnace components above it would be judged on their own heights and the appliance might be kept with cleaning and a new blower, subject to the manufacturer. If the water was clean and rose for only minutes, the cleaning protocol changes but the gas control rule does not: submerged is submerged. And a sealed-combustion appliance with its controls well above the line is a different call from an atmospheric one with a burner at floor level.

How to tell the assessment was done right

• Every appliance has a measured water line and a measured height for each control-relevant part, not a description.
• Every replace call names its reason: manufacturer instruction, contamination, or a component height below the line.
• Nothing was energized or lit before the electrician's sign-off, the leak test and the vent check, and the combustion check was done with a CO monitor running.
• The customer has the record in writing the same day, with the photos attached.

References

• Gas appliance installation and operating manuals, which carry the manufacturer's instruction to replace controls that were under water
• NEMA, Evaluating Water-Damaged Electrical Equipment, the industry guide to which electrical components are replaced after submersion
• FEMA and the National Flood Insurance Program standard policy documents, for basement coverage and the proof-of-loss requirement
• See related: Floodwater Exposure for Any Trade; The Post-Event Equipment Inspection SOP; Backwater Valves and Sewer Backup