Post-Storm Pool Heater Inspection: The Checklist Before You Re-Fire

Hurricanes and hard cold snaps are the two Florida weather events that damage pool heaters in ways that don't show up until you try to fire them. The rule on every storm-affected pool: do not restart the heater until you've verified each item on the checklist below. A heater that ingested flood water or froze its exchanger will fail destructively on first fire.

After a hurricane — the inspection sequence

1. Is it dry? Any sign of standing water inside the cabinet, in the burner tray, or on the control board means the heater needs to be opened, dried, and inspected by a qualified technician before re-powering. Gas heaters with soaked burners should not be fired until fully dry.
2. Is it structurally intact? Screen cages collapse onto equipment pads. A bent cabinet or cracked header is grounds for replacement, not repair.
3. Are all fittings tight? Wind and water movement can loosen unions and plumbing connections. Pressure-test the plumbing before re-energizing.
4. Is the venting clear? A gas heater with leaves, palm fronds, or debris in the vent will backdraft CO on first fire.
5. Is the gas line unstressed? A shifted heater, pulled by ground movement or debris, can put bend stress on the gas connection. Any visible kink or corrugation is a shut-down-and-call-the-utility condition.
6. Are the electrical connections sealed? Open disconnect boxes and conduit Ts need re-sealing after a flooding event. Insects and moisture both migrate into them during storm conditions.
7. Has the pool itself changed chemistry dramatically? A flooded pool with debris and rainwater load will stress the heater on startup. Balance chemistry before calling for long heat cycles.

After a hard freeze — the inspection sequence

1. Never fire a heater with frozen lines. If the plumbing froze, water volume in the heat exchanger expanded; even if no visible damage, there can be hairline cracks that leak on first fire.
2. Thaw passively.Let ambient temperature return to above freezing for several hours before operating the pump. Don't accelerate with a torch or hairdryer — differential thaw cracks fittings.
3. Pressure-test the heater exchangerafter thaw. A hand pump to 25–30 psi held for 15 minutes will reveal any hairline cracks before they ruin your day.
4. Inspect bypass valves and check valves. Freeze damage often shows up at O-rings, spring-loaded components, and solvent-welded fittings before it shows at the heater itself.
5. Verify the freeze-protect circuiton any system that has one — many controllers have a freeze mode that keeps the pump running below a set ambient. Confirm it activated and is still functional.

What to document for insurance

• Photographs of the equipment pad before restoration — date-stamped.
• Photographs of visible damage on each component, close up.
• Serial and model numbers of any equipment you intend to claim.
• A written inspection report from a licensed tech if you're claiming replacement — adjusters expect one for any single-item claim above a few hundred dollars.

When in doubt, don't fire it

The cost of a post-storm service call from a licensed heater technician is measured in hundreds of dollars. The cost of a gas heater damaged on first fire, or a heat-pump compressor that ingested flood water, is measured in thousands. Err on the side of an extra inspection, not an extra service call.