Can You Cover a Pool Heater? Complete Winterizing Guide

Tools & Supplies Needed

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Quick Answer

Yes, you can absolutely cover a pool heater, and it's actually recommended during winter months or extended periods of non-use. However, you must use the right type of cover and follow proper procedures to prevent moisture buildup, corrosion, and equipment damage. The key is using breathable, waterproof materials specifically designed for pool equipment protection.

Step-by-Step Pool Heater Covering Process

1. Turn off and disconnect the heater completely
   Shut off the gas supply valve (for gas heaters) or disconnect electrical power at the breaker. Allow the heater to cool completely for at least 2 hours after last operation.
2. Drain all water from the heater system
   Remove the drain plugs from the heat exchanger and allow all water to drain out completely. This prevents freeze damage and reduces moisture that could cause corrosion during storage.
3. Clean the heater exterior thoroughly
   Remove any debris, leaves, or dirt from around the unit. Use a garden hose to rinse off accumulated grime, then allow to dry completely before covering.
4. Inspect for existing damage or wear
   Check for rust spots, loose connections, or damaged components that should be addressed before winter storage. Document any issues for spring maintenance.
5. Apply corrosion protection if needed
   For older units or those in harsh climates, spray exposed metal surfaces with a light coating of WD-40 or marine-grade corrosion inhibitor.
6. Install the proper cover material
   Use a breathable, waterproof heater cover that allows air circulation while blocking moisture. Secure it tightly but ensure vents remain unobstructed.
7. Create proper ventilation underneath
   Leave small gaps at the bottom of the cover to allow air circulation. Never create an completely sealed environment around the heater.
8. Secure the cover against wind and weather
   Use bungee cords, straps, or tie-downs rated for outdoor use. Ensure the cover won't blow off during storms but can still breathe.
9. Check monthly during winter storage
   Inspect the cover for damage, ensure it's still secure, and look for any signs of moisture buildup or pest intrusion underneath.

Types of Pool Heater Covers

Commercial Heater Covers

Purpose-built pool heater covers made from marine-grade vinyl or polyester offer the best protection. These covers feature reinforced seams, UV protection, and designed ventilation systems. Brands like Classic Accessories and Duck Covers make models specifically sized for popular heater brands like Pentair, Hayward, and Jandy.

Custom Tarp Solutions

Heavy-duty breathable tarps can work but require more careful installation. Choose marine-grade materials with grommets for secure tie-down points. Avoid completely waterproof tarps that don't breathe, as these trap moisture.

Temporary vs. Seasonal Covers

For short-term protection during maintenance, lighter covers suffice. For winter storage, invest in heavy-duty covers designed to withstand months of weather exposure.

Critical Safety Considerations

Never cover an operational heater. Pool heaters generate significant heat and require proper ventilation during operation. Covering a running heater creates fire hazards and can damage the unit through overheating.

Gas heater specific warnings: Ensure the gas supply is completely shut off and that no gas odors are present before covering. Never obstruct gas line connections or emergency shutoff valves with covering materials.

Electrical safety for electric heaters: Disconnect power at the breaker, not just the unit switch. Ensure all electrical connections are properly sealed before applying covers.

What NOT to Use as Heater Covers

• Plastic sheeting or garbage bags - These trap moisture and can cause severe corrosion
• Completely sealed containers - Heaters need air circulation even when covered
• Flammable materials - Avoid covers that could ignite if the heater accidentally operates
• Materials that retain water - Canvas or fabric that stays wet promotes rust and corrosion

Seasonal Covering Schedule

Fall Preparation (October-November)

As temperatures drop below 50°F consistently, begin winterization procedures. This timing allows you to address any maintenance issues before freezing weather arrives.

Winter Monitoring (December-February)

Check covers monthly for damage from ice, snow, or wind. Clear snow buildup that could stress cover materials or block ventilation.

Spring Uncovering (March-April)

Remove covers when temperatures consistently stay above freezing and pool opening approaches. Inspect the heater thoroughly before reconnecting utilities.

Regional Considerations

Cold climates: Focus on freeze protection with complete water drainage and heavy-duty covers rated for snow loads.

Mild climates: Emphasize UV protection and debris prevention rather than freeze protection.

Coastal areas: Use marine-grade materials resistant to salt air corrosion.

Troubleshooting Common Cover Problems

Condensation buildup: Indicates inadequate ventilation. Adjust cover to allow more air circulation while maintaining weather protection.

Cover deterioration: UV damage and weather stress require cover replacement every 3-5 years for optimal protection.

Pest intrusion: Seal obvious entry points while maintaining necessary ventilation gaps.

Properly covering your pool heater extends equipment life significantly and prevents costly winter damage. The investment in quality covers pays for itself through reduced maintenance and repair costs over the heater's lifespan.