Aquastrong 35,000 BTU Inverter Pool Heat Pump Review (HEX035)
- AboveGroundSplash
- May 19
- 10 min read
Updated: Jun 28
The Aquastrong 35,000 BTU inverter pool heat pump is designed for small to medium above-ground pools where efficient, gradual heating matters more than rapid heat-up speed.
Above-ground pool owners know how short swim season can be – but it doesn’t have to end early. The Aquastrong 35,000 BTU Inverter Swimming Pool Heat Pump (120V) is a compact, plug-and-play solution that can warm pools up to ~9,000 gallons. With dual heating/cooling modes and inverter technology, it offers energy-efficient pool heating without the hefty price tag or complicated installation of larger units. In practice, many users report this 120V “plug and play” pump works surprisingly well – one owner found it runs on a standard 20A circuit and uses only about 1 kW/hour to heat their pool.
We will dive into why the Aquastrong 120V inverter heat pump is a smart choice for budget-conscious above-ground pool owners. We’ll cover its affordability, easy setup, WiFi control, and real-world performance – including pros and cons – so you can decide if it’s the best pool heater for above-ground pool at this price point.
Aquastrong 35,000 BTU quick verdict
The Aquastrong 35,000 BTU inverter pool heat pump is best for small to medium above-ground pools where you want stronger heating than an 18,000 BTU unit, but still want the convenience of a 120V plug-in setup.
It is a good fit if your pool is up to around 9,000 gallons, you want efficient season-extending heat, and you prefer a heat pump that can also be controlled by WiFi. It is not the right choice if you have a much larger pool, want rapid heating in cold weather, or need the power of a larger 55,000 BTU or 90,000 BTU model.
Best for: Small to medium above-ground pools
Main strength: 35,000 BTU inverter heating with 120V plug-in convenience
Best pairing: A solar cover to reduce overnight heat loss
Main limitation: Slower heating than larger 240V heat pumps
Worth it? Yes, if you want a strong middle-ground heat pump between the smaller HEX018 and larger 55,000 BTU Aquastrong model.
Energy-Efficient Inverter Design for Lower Bills
Unlike gas or basic electric heaters, inverter heat pumps extract heat from the air and quietly transfer it into your pool with minimal electricity. The Aquastrong inverter pump has a COP (Coefficient of Performance) of 15.8, meaning it delivers about 15.8 BTUs of heat for every watt it uses. In practical terms, Aquastrong claims it uses 70% less energy than a standard electric heater and even 40% less than a gas heater. This makes it an energy-efficient pool heater that can save hundreds over time.
In testing, users find it indeed draws only ~1 kW (1,000 watts) per hour of operation. For a typical summer evening, that translates to only cents on your electric bill each hour. The inverter also means it adjusts power on the fly: it ramps up to heat the pool quickly and then throttles down to maintain temperature, rather than running flat-out all the time.
Aside from efficiency, the inverter design gives quiet operation. This Aquastrong pump runs at about 48 dB – roughly the sound of a quiet refrigerator – when on standard mode. You can comfortably leave it running near the house without being disturbed. And thanks to its smart auto-defrost cycles, it will even work in cooler weather: every 40 minutes it briefly reverses to melt any ice build-up in about 2–5 minutes. This means reliable heating even as the nights start to chill, extending your swim season late into fall.
Auto-defrost technology allows this inverter heat pump to keep running even in cooler conditions, helping you extend your swim season year-round.
120V Plug-and-Play Convenience
One of the biggest draws of this unit is its 120V plug-and-play setup, making installation far simpler and cheaper than larger 240V pumps. The Aquastrong 35K pump is designed to plug into a dedicated 110–120V, 20A outlet. No specialized electrician or new wiring is needed – just position it by the pool, attach the included hose adapters, and plug it into your existing outlet. This “just plug and go” design is a boon for budget buyers and DIY installers. In fact, FibroPool (a pool equipment manufacturer) notes that 120V heat pumps “just [plug] into a standard outlet—no special wiring or costly setup required”.
It even comes with adapters for common pool hoses (1.25″ and 1.5″) and PVC piping, so hooking it up to most above-ground pumps is easy. (You can see the universal adapter kit in the image above.) Aquastrong rates it for pools up to 9,000 gallons, covering most above-ground setups. While it could be used on an inground pool of that size, it really shines for smaller pools where a 240V unit would be overkill.
That said, remember it does pull about 18–20 amps at peak. For best results you’ll want to use a dedicated 20A outlet, not shared with other appliances. One user noted that installing the pump on the same circuit as a garage opener caused occasional tripping at startup. After moving it to its own new 20A GFCI outlet, it ran trouble-free. So plan for a spare 20A GFCI outlet near your pool and you’ll avoid any electrical hiccups.
Smart Control: WiFi and Programmable Timer
Modern convenience is built in. This Aquastrong heat pump is WiFi-capable with an accompanying app (and front control panel) that lets you monitor and adjust the pool temperature remotely. You can set schedules or use the timer, so it only runs when needed – say, heating the pool each morning or evening – without manual intervention. For example, you could program it to warm the pool to 82°F before you get home, then shut off once reached, saving energy.
On the technical side, the app also tracks energy use if you’re curious about your power draw. This smart functionality essentially turns the pump into a WiFi pool heater – tap your phone to raise or lower the heat without even touching the unit. For busy homeowners, the remote control feature adds peace of mind and efficiency, ensuring you never waste power heating an empty pool.
Aquastrong 35,000 BTU specs at a glance
The Aquastrong 35,000 BTU heat pump is best suited to small and medium above-ground pools where steady temperature maintenance matters more than instant heating. The 120V plug-in style setup is convenient, but the dedicated 20A GFCI outlet requirement still needs to be taken seriously.
Its strongest fit is a pool up to around 9,000 gallons, especially when paired with a solar cover or insulated pool cover to reduce overnight heat loss.
The Aquastrong 35K inverter heat pump also includes adapters for 1.25″ and 1.5″ plumbing and a 3-year warranty, making installation straightforward.
Built for Above-Ground Pools (Up to ~9,000 Gallons)
For a typical above-ground pool (often under 9,000 gal), this heater is right-sized. It delivers 35,000 BTU – plenty to raise the water temperature several degrees per hour. Aquastrong’s own specs highlight that it can “deliver 35,000 BTU warmth in hours, perfect for large pools up to 9,000-gallon systems”. In practice, users with 4,000–5,000 gal pools report it easily brings chilly water up to a comfortable 80°F range on a 20–30°F swing.
Because it’s a bit undersized for very large inground pools, it truly excels for above-ground users. You won’t overpay for unnecessary capacity. Also note it supports cooling down the pool to as low as 47°F for those living in very hot regions. While most buyers will only use the heating mode, the cooling function can prevent your pool from overheating on extremely hot days.
Overall, the Aquastrong unit has earned solid customer approval. The official website shows a 4.9/5 star rating (Amazon Best Seller rank), and independent buyers note it “works surprisingly well” on 120V power. It’s often touted as one of the best pool heaters for above-ground pools, especially when cost and ease-of-use are top priorities.
Aquastrong 35,000 BTU vs HEX018 vs 55,000 BTU
The Aquastrong 35,000 BTU model is the middle-ground option in the Aquastrong heat pump range. It gives you more heating power than the smaller HEX018, but it is still easier and more affordable than stepping up to a larger 55,000 BTU model.
Choose the Aquastrong HEX018 if you have a smaller above-ground pool, want the lowest upfront cost, and are happy with gradual heating.
Choose the Aquastrong 35,000 BTU if you have a small to medium above-ground pool and want a better balance of heating power, efficiency, and plug-in convenience.
Choose the Aquastrong 55,000 BTU if your pool is larger, loses heat quickly overnight, or you want faster temperature recovery throughout the season.
Real-World Performance and Savings
Because this is an inverter heat pump, the biggest benefit is not instant heat. It is efficient temperature maintenance once the pool is close to the temperature you want.
To put it in real terms: imagine a 6,000-gallon round above-ground pool at 60°F in early spring. Running this pump on 20A boost could raise the temperature by roughly 1–2°F per hour (especially at first). As the pool warms, the rate slows, but the inverter’s efficiency means it keeps going quietly in the background. Because it uses only about 1 kW, an hour of heating costs around $0.15–$0.20 on a typical electricity plan. That’s far cheaper than firing up a propane or gas heater for the same temperature gain.
By comparison, standard gas heaters can cost $3–$5 per hour to run. Even 240V electric heat pumps often run 3–4 kW, far more than this 120V unit. So while the Aquastrong’s upfront price is not trivial, the long-term savings on energy and no-installation costs make it very attractive for thrifty owners.
One forum user summed up the value: their 35K Aquastrong “works surprisingly well and uses about a kilowatt an hour” on 120V power. They observed that it offset ~40°F of temperature difference for their pool – more than enough to take the chill off a cool morning or warm the pool in spring. Over a season, that can mean swimming weeks longer than you could without a heater.
Pros and Cons of the Aquastrong 120V Heat Pump
Pros:
Affordability: Lower cost than many 240V inverter pumps, with occasional sale price (~$1,250).
Easy Installation: Runs on standard 120V/20A outlet – no electrician needed.
Energy-Efficient: High COP (15.8) means big heat output for small power input.
WiFi Control & Timer: Adjust settings remotely, save electricity with scheduling.
Quiet Operation: Only ~48 dB noise in use.
Year-Round Use: Auto-defrost lets it run in cooler weather; dual-mode allows pool cooling too.
Warranty: 3-year coverage gives peace of mind.
Cons:
Limited Output/Pool Size: Rated up to ~9,000 gallons. A larger pool or very rapid heating needs might require a bigger (often 220–240V) unit.
High Amps on 120V: Draws ~18–20A on boost; needs its own 20A GFCI outlet. Sharing the circuit can cause tripping. (Plan electrical layout accordingly.)
Initial Cost: ~$1,250 may seem steep, though cheaper than many larger heat pumps. Budget buyers must weigh initial cost vs long-term savings.
Performance Dependent on Weather: Like all heat pumps, it works best when ambient air is above ~45°F. Very cold nights slow heating, though defrost helps.
Despite these caveats, for many above-ground pool owners this Aquastrong model strikes an excellent balance of price, efficiency, and convenience. It’s a smart alternative to 240V units when you don’t want to rewire your pool area. As one satisfied user noted, even on a household 120V circuit the 35K pump “works surprisingly well” to heat their pool.
Final verdict: should you buy the Aquastrong 35,000 BTU pool heat pump?
The Aquastrong 35,000 BTU inverter pool heat pump is a strong middle-ground choice for small to medium above-ground pools. It gives you more heating power than the smaller HEX018, while still keeping the convenience of a 120V plug-in setup, WiFi control, quiet operation, and efficient inverter heating.
It is best for pool owners who want to extend the swim season without jumping straight to a larger 55,000 BTU or 90,000 BTU heater. Pair it with a solar cover, use a dedicated 20A GFCI outlet, and treat it as an efficient temperature-maintenance heater rather than an instant heat-up machine.
Choose the Aquastrong 35,000 BTU if your pool is up to around 9,000 gallons and you want a good balance of price, performance, and convenience. Choose the HEX018 if your pool is smaller and budget is the priority. Choose the Aquastrong 55,000 BTU or DR. Heater DR-900HP if your pool is larger, colder, or needs faster recovery.
Compare before you buy
If you are still deciding which pool heater is right for your above-ground pool, these guides can help:
👉 Aquastrong HEX018 review — better for smaller above-ground pools and lower-cost gradual heating.
👉 Aquastrong 55,000 BTU review — better for larger pools or faster heat recovery.
👉 DR. Heater DR-900HP review — a stronger 90,000 BTU inverter heat pump for bigger heating demands.
👉 Pool Volume Calculator — use this if you are not sure how many gallons your pool holds.
👉 Heat Pumps & Solar Covers — compare more above-ground pool heating options.
Frequently Asked Questions
What size pool can the Aquastrong 35,000 BTU heat pump handle?
The Aquastrong 35,000 BTU inverter heat pump is best suited for small to medium above-ground pools up to around 9,000 gallons. Performance will vary depending on air temperature, wind exposure, starting water temperature, pool cover use, and desired swim temperature.
Is the Aquastrong 35,000 BTU good for above-ground pools?
Yes. The Aquastrong 35,000 BTU heat pump is a good fit for many above-ground pools because it combines 35,000 BTU heating capacity, inverter efficiency, 120V plug-in convenience, WiFi control, and quiet operation.
How fast will the Aquastrong 35,000 BTU heat a pool?
Heating speed depends on pool size, air temperature, starting water temperature, and whether you use a solar cover. It is best viewed as an efficient season-extending heat pump, not an instant heater. For best results, let it gradually raise and maintain the water temperature.
Does the Aquastrong 35,000 BTU need a dedicated outlet?
Yes, a dedicated 20A GFCI outlet is strongly recommended. The unit can draw high amps on 120V power, especially during startup or boost operation, so sharing the circuit with other appliances may cause tripping.
Is the Aquastrong 35,000 BTU energy efficient?
Yes. The Aquastrong 35,000 BTU model uses inverter heat pump technology and can reach a maximum COP of up to 15.8 under optimal conditions. That means it can deliver much more heat output than the electrical energy it consumes.
Should I buy the Aquastrong 35,000 BTU or HEX018?
Choose the Aquastrong 35,000 BTU if your pool is closer to medium size, you want stronger heating, or you want better temperature recovery than the smaller HEX018. Choose the HEX018 if your pool is smaller and your main priority is the lowest upfront cost.
Should I buy the Aquastrong 35,000 BTU or 55,000 BTU?
Choose the Aquastrong 35,000 BTU for small to medium above-ground pools up to around 9,000 gallons. Choose the Aquastrong 55,000 BTU if your pool is larger, loses heat quickly overnight, or you want faster heating recovery.
Is the Aquastrong 35,000 BTU worth it?
Yes, if you want a middle-ground above-ground pool heat pump with more power than the HEX018 but do not need a larger 55,000 BTU or 90,000 BTU model. It is strongest for owners who want efficient, gradual heating with simple 120V installation.
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