Pool Heaters & Heat Pumps
Best Energy Efficient Pool Heater (2026): Our 4 Picks Ranked
As an Amazon Associate I earn from qualifying purchases. Specs below come from each product's Amazon listing; we do not test products in person.
The AQUASTRONG heater leads this list: it pairs 55,000 BTU with 15.8 COP, app control and a 3-year warranty, for pools up to 16,000 gallons. If your pool is smaller, the Della Omi Spark covers pools up to 7,000 gallons with a cover, with 21,000 BTU and app control.
Starting out? See the main guide: Best Pool Heater
Top picks at a glance
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Best OverallAQUASTRONG Swimming Pool Heater for Above Ground9.8 View on Amazon -
Most Heat OutputBluePlenum Pool Heat Pump9.5 View on Amazon -
9.4 View on Amazon -
Also GreatDella Omi Spark9.2 View on Amazon
Compare the specs
Ranked on heat output, phone app control from each listing, plus how many buyers have rated it. A dash (—) means we could not confirm that figure from the listing.
| Pick | Heat output | Phone app control | Weight | Warranty |
|---|---|---|---|---|
| 1. AQUASTRONG Swimming Pool Heater for Above Ground | 55,000 BTU | Yes | 116.84 lb | 3-year |
| 2. BluePlenum Pool Heat Pump | 58,000 BTU | Yes | — | 3-year |
| 3. WARMBLU 10,000 Gallons Above Ground Pool Heater | 35,000 BTU | Yes | 112.44 lb | — |
| 4. Della Omi Spark | 21,000 BTU | Yes | 59.5 lb | 2-year |
AQUASTRONG Swimming Pool Heater for Above Ground
It pairs 55,000 BTU with 15.8 COP, app control, heating and cooling modes, and a 3-year warranty.
- Heat output: 55,000 BTU
- Phone app control
- 3-year warranty stated
Good for
- Owners of pools up to 16,000 gallons who want heating and cooling
- Buyers who want app control and scheduled heating
Skip it if
- You need heat for a pool over 16,000 gallons
- You want a heater light enough to carry alone, since it weighs 116.84 lb
It runs heating from 47 to 104 degrees and cooling from 47 to 83 degrees, with full DC variable frequency output at 15.8 COP. It runs at 50 dB, and auto-defrost cycles start every 40 minutes and finish in 5 minutes. It has 3 connection options, including a 1.25 inch and 1.5 inch hose adapter, and it carries a 3-year warranty.
BluePlenum Pool Heat Pump
It delivers up to 58,000 BTU at 16.2 COP, with heating, cooling, auto and defrost modes, and a 3-year warranty.
- Heat output: 58,000 BTU, the most here
- Phone app control
- 3-year warranty stated
Good for
- Owners of pools up to 18,000 gallons who want heating and cooling
- Buyers who want app control with a daily heating schedule
Skip it if
- You need heat for a pool over 18,000 gallons
- You want a setup with no electrician visit
It runs heating from 47 to 104 degrees and cooling from 47 to 83 degrees, with temperature control within 1 degree. It runs at 28 dB, uses R32 refrigerant, and works with 1.25 inch and 1.5 inch pool pipes. A protective cover is included, and it carries a 3-year warranty.
WARMBLU 10,000 Gallons Above Ground Pool Heater
It delivers 35,000 BTU at COP 16, with app control and a titanium heat exchanger, for pools up to 10,000 gallons.
- Heat output: 35,000 BTU
- Phone app control
Good for
- Owners of above-ground pools up to 10,000 gallons
- Buyers who want app control and a touch panel
Skip it if
- You need heat for a pool over 10,000 gallons
- You want a heater light enough to carry alone, since it weighs 112.44 lb
It handles pools up to 10,000 gallons with a corrosion-proof pure titanium heat exchanger. Noise stays below 50 dB, and control runs through the mobile app or the touch panel. It weighs 112.44 lb.
Della Omi Spark
It delivers 21,000 BTU with app control, voice control, and Heating, Cooling, Auto, Boost and ECO modes.
- Heat output: 21,000 BTU
- Phone app control
- 2-year warranty stated
Good for
- Owners of above-ground pools up to 7,000 gallons with a cover
- Buyers who want voice control and ECO mode
Skip it if
- You need heat for a pool over 7,000 gallons with a cover
- You want heat for a pool over 4,700 gallons with no cover
It warms water to 104 degrees and cools it to 47 degrees, and it works in ambient temperatures down to 41 degrees. It runs at 48 dB(A), with a titanium heat exchanger, and it works with chlorinated and saltwater pools. It carries a 2-year parts warranty and a 10-year compressor and heat exchanger warranty.
How to choose
Compare COP, not just BTU
COP compares heat output with electricity input, so a higher COP means more heat from the same input. The BluePlenum has 16.2 COP, the WARMBLU has COP 16, and the AQUASTRONG has 15.8 COP. The Della has 4.02 COP at 50 degrees and 4.97 COP at 80.6 degrees, each tied to its own test temperature. BTU still matters: the BluePlenum delivers up to 58,000 BTU, the AQUASTRONG 55,000 BTU, the WARMBLU 35,000 BTU and the Della 21,000 BTU. Match BTU to your pool size first, then compare COP among the models that cover it.
Match output to pool size
Start from the pool size each model covers. The BluePlenum covers pools up to 18,000 gallons, the AQUASTRONG up to 16,000 gallons, the WARMBLU up to 10,000 gallons, and the Della up to 7,000 gallons with a cover or 4,700 gallons with no cover. Pick a model whose gallon figure covers your pool, then compare BTU and COP among the models that fit.
Controls, modes and upkeep
All four models here have app control. The Della adds voice control and Heating, Cooling, Auto, Boost and ECO modes. The BluePlenum adds a 4-in-1 system covering heating, cooling, auto mode and a defrost mode. The AQUASTRONG adds an auto-defrost cycle. For upkeep, keep the area around the unit clear for airflow.
FAQ
What does COP mean on a pool heat pump?
COP compares heat output with electricity input, so a higher COP means more heat from the same input. The BluePlenum has 16.2 COP, the WARMBLU has COP 16, and the AQUASTRONG has 15.8 COP.
Which pool heater here covers pools up to 18,000 gallons?
The BluePlenum covers pools up to 18,000 gallons, with up to 58,000 BTU and 16.2 COP.
Do these pool heaters have app control?
Yes. The AQUASTRONG, BluePlenum, WARMBLU and Della models each have app control, and the Della also works with voice commands.
What size pool does the Della Omi Spark cover?
It covers pools up to 7,000 gallons with a cover, or 4,700 gallons with no cover, with 21,000 BTU and app control.
