Cold water can end a pool time early — but the right pool heater can give you twice as many days to swim. Selecting the best pool heater can be a confusing process at the beginning. There are various sizes, types of power, and installation requirements to take into consideration. Most people begin their search for a pool heater by looking into above Ground Pool Heaters because they are easy to install, affordable, and fast to set up.
But are they the best option compared to in-ground pool heaters? It all depends on your pool, your location, and your intended use of the pool. We will help you sort this out in a simple and friendly way so you can decide with confidence.
Why Pool Heaters Matter More Than You Think
A pool heater is more than a luxury component. A pool heater can double your swimming season. Industry surveys indicate that pools with heaters are used 40-60% more during the cooler months than unheated pools. This translates to more family time, more exercise, and greater value for your pool investment.
A pool heater can also:
- Maintain a constant water temperature
- Eliminate cold shock
- Allow kids and seniors to swim longer
- Assist in therapy and low-impact exercise
Now, let’s compare both types of pool heaters side by side.
What Are Above Ground Pool Heaters?
Above ground pool heaters are designed for pools that are situated on the ground. They are typically smaller and easier to set up. They can be easily connected to the pump and filter systems that are already in place.
Some common varieties include:
- Electric pool heaters
- Gas pool heaters
- Heat pumps
- Solar pool heaters
They are preferred due to their ease of installation and relatively low upfront cost.
Best Features of Above Ground Pool Heaters
- More affordable to purchase
- Faster installation time (often done on the same day)
- Smaller in size
- Ideal for seasonal pools
- Easy to upgrade or replace
This is a good choice for families who have pools that are only used during the summer months.
What Are In-Ground Pool Heaters?
In-ground pool heaters are meant for permanent pools that are built into the ground. They are typically more powerful and are designed to handle larger amounts of water. They also tend to work in conjunction with more complex plumbing and electrical systems.
They are typically used in conjunction with:
- In-built pools
- Larger pool capacity
- Year-round pool usage
- Spa and pool combination systems
They are typically more expensive but provide greater heating power.
Cost Comparison: Upfront vs Long Term
Let’s discuss the cost in clear terms.
Average market price ranges (subject to geographic location):
- Above ground heater: $300 – $2,000
- In-ground heater: $1,500 – $5,500
Installation costs also vary:
- Above ground: typically low or DIY-capable
- In-ground: typically requires professional installation
Energy consumption is also a concern. According to energy efficiency studies:
- Modern heat pump technology can cut heating bills by 50-70% compared to traditional electric resistance heaters.
- Solar systems can cut energy costs the most, but heating time is longer.
If price is your first criterion, above ground pool heaters are likely the best choice.
Heating Performance: Speed, Power, and Efficiency
Heating speed is more dependent on the heater than the pool, but pool size is a factor.
In-ground pools have more water. More water means:
- More energy is required
- Longer heating time
- Higher BTU requirements
Typical heating power:
- Small above-ground pool heater: 50,000–120,000 BTU
- In-ground pool heater: 150,000–400,000+ BTU
Gas heaters heat water the fastest. Heat pumps heat water more slowly but use more energy. Solar heating is the slowest but most economical.
For fast weekend heating, more powerful units (commonly used for in-ground pools) are better.
Installation Made Simple (or Not So Simple)
Installation complexity is where the difference is most apparent.
Above ground heater installation is typically:
- Plug-and-play installation
- Hoses are standard and compatible
- Less plumbing work is needed
- Fewer electrical changes are necessary
In-ground heater installation may require:
- Hard plumbing connections
- Gas line or high-voltage electrical connections
- Permitting in some areas
- Professional installation
If you want a simple installation process, above-ground pool heaters are easier to work with.
Maintenance and Lifespan: What to Expect
Every pool heater requires maintenance, but the complexity of maintenance differs.
Above ground pool heaters:
- Easier to reach
- Faster to check
- Less expensive to repair
- Easy part replacement
In-ground pool heaters:
- More internal components
- Higher repair cost
- More likely to require professional maintenance
Maintenance data from pool service organizations indicates that the average lifespan of a pool heater increases by 30-40% with annual inspections and descaling.
Regardless of your choice, annual maintenance is a good idea.
Space Requirements and Equipment Installation
Space planning is often neglected.
Above ground heaters:
- Take up less space
- More flexible installation
- Ideal for small yards
In-ground heaters:
- Require a separate pad area
- Must comply with clearance regulations
- Typically installed near equipment pads
If your equipment pad is small, compact models are easier to install.
Climate Considerations and Seasonal Use
Your local climate is very important.
Select Above Ground Pool Heaters if:
- You swim mostly during warm seasons
- You need fast seasonal heating
- You have a pool cover when not in use
- You prefer a lower purchase price
Select in-ground pool heaters if:
- You swim throughout the year
- It gets cold at night
- Your pool is large
- You prefer spa-hot temperatures
Heat pumps are best suited for temperatures above 10°C (50°F). Gas heaters operate in all climates.
Energy Efficiency Quick Look
Here’s a quick efficiency comparison:
| Heater Type | Efficiency Profile | Running Cost | Key Advantage |
| Solar heaters | Highest efficiency | Lowest | Uses free sunlight for heating |
| Heat pumps | Strong efficiency balance | Low–moderate | Best mix of savings and steady heating |
| Gas heaters | Fastest heating | Higher | Heats water very quickly |
| Electric resistance | Lowest efficiency | Highest | Simple setup and lower upfront cost |
Energy experts estimate that making the switch from conventional electric to heat pump heating can save pool owners $300 to $800 per year.
Final Verdict: Which Is Better?
Ultimately, whether you should get an above ground or in-ground pool heater depends on what you plan to use the heater for, how much you are willing to spend, and what your climate is like. Above ground pool heaters are perfect for small pools that are only used seasonally because they are less expensive, easier to install, and maintain.
In-ground pool heaters are best suited for larger pools that need to be heated to a higher temperature, such as pools that are used year-round.
By getting a pool heater that is suited for your needs, you can enjoy warmer water, a longer swim season, and more bang for your buck.
