Pool Care /
How to Heat an Above Ground Pool Safely and Effectively
The best way to heat an above ground pool is to cut heat loss first, then choose a compatible pool heater or solar option and follow the manual carefully.
Archive date: this article was written for PoolSkimmer on Oct 23, 2026 and given the earlier archive date of Aug 19, 2026 so the blog reads as an organized archive. It was not published on that date.
To get the most out of an above ground pool heater, one should first put in place the means to limit heat loss before introducing a heating system. A solar cover will do much to hold in warmth, while a pool or solar heater that is right for the job can be counted on to bring up the water temperature. Of course, proper circulation and adherence to the equipment manual are also key.
What to do first
There are some fundamentals that apply to any heating plan:
- Ensure the water is clean so the pump and filter have no trouble moving it.
- Remove any obstructions from the skimmer and basket to allow for unimpeded flow.
- Put a cover on the pool when it is not in use; this goes a long way toward cutting down on overnight heat loss.
- Service the filter as the manual dictates.
Hayward’s own maintenance advice is to view the skimmer, pump, strainer, drains and filter as a single circulation system. When that is working well, the water stays properly filtered and the chemicals do their job.
The easiest approach
For a lot of owners, the path of least resistance is to prevent existing heat from getting away. Putting on a solar cover is the simplest thing to do since it curbs evaporation and surface heat loss. It is not a substitute for a heater, but it makes whatever method you employ more effective.
Then there are the more conventional options:
- Solar heating which warms the water with the sun as it circulates.
- Electric or gas heaters for a faster result, provided they meet local and pool requirements.
- A heat pump to pull in outdoor air for a steady supply of heat.
Which is best will come down to your budget, climate and how fast you want warm water.
Picking a heater
The unit you choose has to be in keeping with your pool, its plumbing and power supply. Rather than make an educated guess, it is better to have the type of pool, the code and the manual in front of you before you commit to a purchase or install anything.
We would suggest the following order of operations:
1. Verify compatibility between the heater and your current equipment. 2. See if your setup is amenable to a heat pump, gas, electric or solar option. 3. Read through the manufacturer’s manual and take note of any warnings. 4. Do not begin heating until you are sure the circulation is sound. 5. Have a pro handle the installation if any electrical or plumbing work is involved.
Heating without the waste
You can be more efficient by tending to the basics. Run the pump as you should to get even distribution of warmer water, and keep the level where the system can do its job. Skim off debris on a regular basis and put the cover on when done for the day. A heater is only as good as the conditions in the pool; a dirty filter or poor circulation will slow things down and make the process less efficient.
Things to steer clear of
Leave electrical and structural repairs alone, and never attempt live suction work. The pump should be off before you open up the skimmer basket or reach into any running equipment. Observe the chemical labels and wear the appropriate PPE when servicing the gear. And if there is an electrical issue or the water is not safe, do not swim.
Time for a professional?
If you are in any doubt about a heater’s compatibility, or if the pump and filter are not doing what they should, call in someone qualified. The same applies if you need to alter controls or make electrical connections, or if the manual stipulates that a solar or gas install must be done by a pro.
Put simply, the safest course is to ensure the equipment is clean and the circulation is good, start with a cover, and then select a heater that suits your needs and follow the instructions to the letter.
Sources and further reading
- [Hayward: Weekly pool maintenance](https://www.hayward.com/maintenance/weekly-pool-maintenance)