As winter approaches, you may wonder how best to prepare your gas pool heater for the cold months ahead. Properly winterizing your pool heater is not just recommended—it’s crucial for extending the lifespan of your device. By following a few straightforward steps, you can ensure your pool heater is in optimal condition when you need it next summer. This guide will walk you through the process, answering all the questions you might have and offering actionable advice along the way.

Why Winterize Your Pool Heater?

Before we dive into the process, let’s understand why winterizing your pool heater is so important. Pool heaters are susceptible to damage from ice and freezing temperatures, which could lead to leaks and even complete failure of the unit. It also saves you from potential repair costs and the inconvenience of a malfunctioning heater when you’re eager to jump back into the pool next season.

Cutting Off the Gas Supply

First on your winterizing checklist should be cutting off the gas supply to the heater. To do this, locate the valves on the gas line that feeds your pool heater. By shutting off these valves, you ensure that no gas is going into the unit, making it safe for the winterization process.

Turning Off the Heater and Adjusting Pressure Settings

Next, make sure the heater itself is turned off. You’ll also need to open the pressure switch, which helps to equalize pressure in the system. The importance of this step lies in ensuring that no pressurized air or water remains trapped inside the heater, where it could freeze and cause damage.

Draining the Unit

Once the heater is off and the pressure switch is open, you’ll want to turn your attention to the drain plugs. Removing these allows any remaining water to escape, preventing it from freezing inside the unit. Make sure to store these plugs in a safe place, so they’re readily available when you’re preparing your pool for the next season.

Clearing the Heater

Finally, use a shop vacuum or a leaf blower to blow out any remaining debris from the heater. This ensures that the internal components remain clean and ready for operation when the warmer months roll around again.

Key Takeaways

Winterizing your gas pool heater is not just a best practice; it’s essential for the longevity and optimal performance of your unit. The process involves shutting off the gas supply, turning off the unit, draining any remaining water, and clearing out debris. By investing a little time and effort now, you save yourself from potential headaches and costs in the future.


Taking the time to properly winterize your gas pool heater is an investment in its future — and in your peace of mind. With these easy-to-follow steps, you’re well-equipped to get your heater ready for the winter, ensuring it’s ready to go as soon as the weather warms up. Until then, you can rest easy knowing you’ve done your part to take care of your pool and its equipment.