How Long Does It Take To Heat A Pool? Complete Guide

How Long Does It Take To Heat A Pool

When we approach pool season, most people are curious about How long does it take to heat a pool? It is a crucial query for everyone who wishes to use their pool all season long.

The time it takes for a pool to heat up is based on many factors, such as the amount of water in the pool, heat loss, and whether the heater is gas or electric. In ideal conditions, many heat pumps will increase the temperature of your pool by 2 to 3 degrees per hour.

You can use a solar cover or a tiny electric heater to heat smaller pools. If you cover your pool when it’s not in use, the temperature will exceed it quickly. In this article, we will discuss how long does it take to heat a pool?

How Long Does It Take To Heat a Pool?

It is a crucial query: how long does it take to heat a pool? It assists pool owners in determining which size pool heater users may require in their pool, as well as how far ahead of time they should start their heater to ensure that it is warm.

Nobody goes swimming in a cool pool, particularly now that pool heaters are accessible, and even if you ever have one, we are sure you would not like to queue up. Pool heating systems add comfort to your swimming experience and can extend the time your pool is accessible for days straight.

A heat pump typically warms a pool by 21 degrees Fahrenheit in 24 to 84 hours. However, this would be determined by a component such as a heater’s BTU (British Thermal Unit) outcome and the pool’s actual design and water level.

A heat pump can heat a smaller pool, such as a spa pool, in 50 minutes to an hour. However, this will take a long time for bigger pool exteriors that are chilly.

How Long Does It Take For a Pool To Heat Up By The Sun?

How Long Does It Take For a Pool To Heat Up By The Sun

Using the sun’s heat is the right way to warm the pool. It would be the most organic and cost-effective method of heating your pool. You can take a warm shower in your pool by heating it with sunlight and setting the temperature to the perfect pool temperature.

You can use your available heater when you like with a well-designed layout. The ability to warm a pool with sunlight is dependent on several factors. These factors have an impact on how long does it take to heat a pool and how effective it is?

Factor.1: Heat Loss

The capacity of each substance to soak up heat varies. As a result, heat loss can be essential to this procedure. Use solar paper to soak up the sun’s rays for a prolonged period to enhance the heat.

Factor.2: Size of Pool

The shape of the pool does have a significant influence on the sun’s ability to warm it. It will take longer to clean a bigger pool than a smaller one. On the other hand, the larger pool will have a large area to provide shade from the sun.

On the other hand, a smaller pool has a shorter range to encompass. In addition, a bigger pool contains more tonnes of water than a smaller pool. As a result, the bigger pool will take longer to be harmed by sunlight.

Factor.3: Temperature of Water

It will take longer when the water temperature drops throughout any heating system. But, when the water temperature is 9 degrees Fahrenheit, it will take longer than if the temperature is 19 degrees Fahrenheit.

As a result, whenever your pool’s water temperature drops, more solar light time will be required to warm the pool.

Factor.4: The Sunlight Angel

The angle of the sun is another consideration. When the sun shines directly on the pool, it will heat up faster than ever. It will take longer to warm the water if it has a slightly bigger warm-up angle.

Likewise, the angle is more significant in the evening or afternoon so it will take longer.

How Much Propane Does a Pool Heater Use?

When it comes to heating the pool on winter days, propane pool heaters outperform other types of water heating options. A propane heater heats the water inside the pool by using propane gas. It generally requires the use of a propane gas tank.

Propane would be vaporized and produced. The burning of that vapour will power your pool heat source. And it has a distinctively designed pump that allows the water to flow through the filtration system. The pool heater will then continue to flow the water.

Pool Heaters That Use Propane

When using it for the first time, you must be aware of the propane pool heater’s usage limitations. A pool heater is one of the more significant pieces of equipment. It has a capacity of 4 propane gallons per hour.

Each gallon could power a 100,000 BTU (British Thermal Unit) pool heater for an hour. To put it another way, four gallons of propane could power a 400,000 BTU pool heater for one hour.


“BTU” stands for British Thermal Unit. The level of work needed to increase the temperature of one pound of water by one degree F is measured in BTUs. Many pools have a capacity of 21,000 gallons. Or, one gallon of water weighs 8.35 pounds.

It means you may need 175,000 British Thermal Units to increase the pool water temperature by a degree. As a result, using a 400,000 BTU pool heater for 60 minutes would raise the temperature of the water by an absolute maximum of 1.83 degrees.

Propane pool heaters seem more effective than other types, allowing you to warm your pool faster while using slighter energy.

Should I Leave My Pool Heat Pump On All The Time?

Should I Leave My Pool Heat Pump On All The Time

It’s not a good idea to constantly leave a pool heat pump running. Maintaining it when the pool is warm is a waste of electricity. In addition, energy prices will go up month-to-month due to this.

Programming the heat pump’s thermostat to switch on when the temperature falls below a predetermined level is preferable. The pump would then switch off once the preferred temperature is reached.

Whether you set your thermostat to a temperature that is greater than the amount of outside air, the heat pump will operate continuously. You can also adjust the temperature to your preferences.

You can turn it down to save electricity when you’re going on a holiday and will not be using your heat pump. Indeed, the best time to switch off your heating system is when you’re holing up your pool. You’ll like to switch it off to prevent any harm to your pool.

Should I Run Pool Heater Overnight?

Whether you have a pool shield or not, you may stay in the pool heater overnight depending on your requirements, plans, or whether you have pool shield. The heating procedure is also affected by the weather.

When you live in a cool climate and leave your pool exposed, the temperature will fall to around 3–4 degrees. It may take up to 28 hours for such pool heating systems to reach the target temperature.

Turning the heating system on overnight will have no effect when you use it the following day. Put another way; you can’t receive heated pool water as per your preference. If you do not have a shield, evaporation and energy loss will happen in the dark, increasing your electrical expenses.

You can run your pool heater overnight when you have a sunlight pool cover. By soaking up the energy from the sun, the solar cover or duvet will prevent evaporation and heat loss.

Next, it will transmit the heat to keep the pool temperature slightly warmer. If you leave the heater on all night, there will be no heat loss, and you will achieve a suitable swimming temperature.

FAQS: How Long Does It Take To Heat a Pool?

How Long Does It Take To Heat a Pool With a Heater?

Gas pool heaters heat a pool quickly and are best suited for longer pools; unlike most electric heaters, which little by little heat the water; gas heaters can raise the temperature of your pool by many degrees in a matter of hours.

How Long Does It Take To Heat a Pool 10 Degrees?

It varies on the size and depth of your pool. As well as that, of course, there’s the weather. However, in a 12′ x 24′ pool, 10 degrees can be raised in 40 hours using natural gas heat.

To save time, speed up the process, and utilize natural resources! Using the sun’s heat, you can warm a pool by 10 degrees in less than 40 hours. Although this will work on cloudy days, wrapping your water heater and pipes to protect them from heat damage is still a brilliant idea.

Bottom Line

The Bottom Line, heating the pool takes a long time and hard work, varying according to the size of your pump. Are you having trouble figuring out how long it takes to heat a pool? Try using sunlight blankets to wrap it overnight when it isn’t in use.

We hope it’s now a little easier. How long does it take to heat a pool? Visit our website for more quality content regarding pool cleaning.