How long does it take to fill a hot tub? This is an important question that you should remember when considering buying a hot tub. Keep reading to the end to know about the answer and other relevant information.

This post may have affiliate links, which means I may receive commissions if you choose to purchase through links / provide (at no extra cost to you). As an Amazon Associate, I earn from qualifying purchases. Please read my disclaimer for additional details.

How long does it take to fill a hot tub?

Usually, it takes about 90-120 minutes to fill up a hot tub with a capacity of 300-400 gallons. However, this is not always true as there are many factors affecting the filling time.

  1. What size of water hose you are using?

There is no doubt that choosing a hose with a large diameter will speed up the hot tub filling process.

The diameter of a typical water hose is 0.75 inches while for the others, it can be 0.5 or up to 1.5 inches.

So, for hot tubs that have 5 to 6, or more, seats, select the 1.5-inch water hose; for smaller ones, either 0.5 or 0.75-inch hose will be fine.

  1. What size of your hot tub?

The larger the capacity of the hot tub, the longer it will take you to fill it up.

If you are not sure about the exact capacity of your hot tub, you can check it in the product manual.

Normally, the size of a hot tub ranges from 150 to 700 gallons. And 300 gallons is the average capacity.

  1. How strong is the water pressure?

Your hot tub’s filling time also depends significantly on water pressure. Low water pressure will result in a longer filling time, and vice versa.

If you live in the countryside, you will probably have lower water pressure since you have to take water from a deep well. The reverse is true when you live in a city or town.

You should note that the water pressure also depends on the pump capacity as well as the size and the length of the water hose you are using.

Should you use hot water to fill the hot tub?

hot water to fill the hot tub

Some people want to save time and energy by filling up their hot tubs with hot water. However, experts advise against doing so because it is dangerous.

If you insist on doing so, make sure to gradually increase the water temperature.

The best way is to remove the airlock first then increase the amount of water by adding the hot water slowly to the cooler water in the hot tub.

Should you empty the water after using the hot tub?

You do not need to drain the water from the hot tub after use because after reaching a certain temperature, maintaining that level of temperature only uses a little electricity.

Keeping the water in the hot tub also allows you to relax whenever you want.

If you empty the hot tub after using it, you will have to refill it and wait for the water to reach the desired temperature each time you want to use it.

This not only takes time and effort but also makes electricity bills and water bills skyrocket each month.

Should you turn the hot tub power off when filling it?

Well, you do not need to turn the power off when filling because this thing is designed to use around water. It will also be okay even if the water is splashed all over the place.

Disconnecting the power supply, on the other hand, is a good idea if you’re not sure about the safety of your electrical device or want to be extra cautious.

A universal piece of advice is that you should dry your hands before touching any electrical equipment.

How often should you change the water in your hot tub?

change the water in your hot tub

Normally, you should change the water after about three to four months. However, in case a lot of people use the hot tub or it is placed outdoors, you should change the water in the hot tub every 1 to 2 months.

Regular water changes are necessary because the warm water in the hot tub is an ideal environment for bacteria to grow.

In addition, at a relatively small size, hot tubs also become contaminated rapidly.

Total Dissolved Solids (TDS) is another reason why you need to change the water. This is because when too many solids fall into the water, they decrease the effectiveness of chemicals such as bromine, chlorine, etc.

When the TDS level gets too high, the only way to reduce it is to drain and refill the water. You can choose to drain the water in half to reduce the TDS level, but it would be best if you could replace all of the water in the hot tub whenever possible.

How to empty your hot tub water before filling it up?

If you are using a new hot tub on the market, it probably has plastic siding. The first thing you need to do is remove the 2 screws in the corner to reveal the hose spigot. Then connect the water hose to the spigot and point it in the direction you want the water to go.

However, you will not need to go through the hassle of removing the siding and using a garden hose if you invest in a submersible pump and 25 ‘hose.

\With this device, all you need to do is to drop it in the water and your hot tub will drain in no time.

Just keep in mind that you have to submerge the pump into the water before turning the power on and there will be some remaining water that can quickly be eliminated with a wet-dry vacuum.

Final words

How long it takes to fill a hot tub will depend on several factors such as its size, the hose diameter, and water pressure. For a mid-sized hot tub, normally it takes about 90-120 minutes.

The good news is that you do not have to spend too much time on this task as you only need to change the water every few months to keep the water clean and fresh.

Finally, make sure to clean a sitting hot tub properly before filling it with water.


Leave a Comment