Hot Tub Plumbing Diagram for Beginners


A hot tub or spa plumbing system is made from PVC pipes and fittings. It is connected in a closed-loop, much like an electric circuit. This means that the same water can travel through the hot tub plumbing diagram a few times a day.

Without the diagram, there would be no hot tubs as we know them today. However, not much is known about it since it is hidden behind the shell. In this article, we will talk about it in detail, making you aware of the process which made it possible to have a relaxing bath. Read on to learn more about hot tub plumbing explained.

Hot Tub Plumbing Diagram Basics

Proper plumbing is crucial for great tub performance as well as your satisfaction. It has many parts that serve different functions, such as pumps, heaters, fittings, nuts, plugs, etc. All these parts are necessary for your tub to work.

Since the hot tub plumbing system forms a closed loop, there is no distinct end or beginning. That is why the tub plumbing diagram is different than most kinds of plumbing. Let’s begin the detailed description of each part:

  • Suction line. Hot tub water needs to be continuously filtered, removed, and returned to the tub to stay clean and safe. Sucking the water out is made possible by the suction line. It is powered by a tub pump.
  • This part of the tub plumbing system is very beneficial when it comes to getting rid of debris and leaves, for example. All tubs and similar bodies of water utilize this part to maintain clear water. It works by using the suction from the pump, which then draws in everything that accidentally falls into water, from leaves to hair ties.
  • If you want to know more about hot tub plumbing explained, you should get familiar with the pump. It is responsible for both pushing the water back into the tub as well as drawing it out. Both the suction lines and the skimmer reach the pump, and the water then goes to the filtration phase.
  • Filters are made from fabric or fine mesh which serves to catch smaller items, algae, moss, and particles that cannot be trapped by the skimmer.
  • When the process of filtration is done, the water then moves through a PVC pipe until it reaches the heater. It serves to raise the water temperature and provide you with a relaxing bath. Heaters can have up to 30 parts, such as the heating element, the bulkhead nuts, or the housing.
  • Return line. This part should not be confused with the suction line. It is made from fittings and PVC pipes that move past the heater and reach the manifolds for a fresh hot water supply.
  • Air control. This part is not a standard component of the hot tub plumbing system. However, it is worth mentioning since it is responsible for creating a relaxing massaging sensation. Water serves to create a suction which makes it possible to pull the air through the air control part and then out of the jet. The air control should not be confused with the bubble-making air blower.
  • The manifold structure depends on the type of tub you own. For example, you may either have a manifold network or a main manifold part. This part is a distributor of the waterline.
  • PVC tubes. Every hot tub jet unit has flexible PVC tubes that deliver a mixture of water and air. There is at least one tube for each jet. The tub water passes through them, forming a closed-loop, which is one of the essential characteristics of any hot tub.
  • To finish off the hot tub plumbing explained guide, you should get familiar with the jets. Standard hot tubs have at least 70 jets. The jets create a stream of water and air, which feels very good on the skin and can relax your muscles after a long day.

Additional Information

There are several main hot tub plumbing components. However, for the tub to function properly, it relies on hydraulic science. For example, pipes have to become narrower before they approach the jets to create an air and water mixture. It is necessary for the jet nozzles which create the jetting action.

This process decreases the water pressure. While the water is passing through numerous pipes that gradually become narrower, water velocity increases. The decrease in pressure forces the water into the return line through air control. Such induction force is called the Venturi effect in physics and there would be no modern tubs without it.



Q: How Does Hot Tub Plumbing Work?


Hot tub plumbing is a closed loop, so we can say that it starts at the skimmer, which is where the water leaves the tub. Next, it passes through the filter and heater and is then pushed through a smaller pipe before returning to the tub. The same drop of water can make this journey a few times a day.

Q: Do You Need Plumbing for a Hot Tub?


Yes, you need plumbing for a hot tub because it is an essential part of any tub. Without it, hot tubs would only be small pools of water.

Globo Surf Overview

The hot tub plumbing diagram is necessary for any hot tub to function properly. It forms a closed loop and it has many different parts. Without it, having a relaxing tub bath would not be possible. Some of its main parts are a skimmer, pumps, PVC pipes, filters, jets, etc.

The water leaves the tub at the skimmer and then starts traveling through the plumbing system. It reaches the heater and the filters, before being pushed back into the tub. The same body of water can travel this path a few times a day. Also, the tub utilizes hydraulic science to decrease the pressure and push the water through the pipes.

More Hot Tub Reviews:

Globo Surf
My name is David Hamburg. I am an avid water sports fan who enjoys paddle boarding, surfing, scuba diving, and kite surfing. Anything with a board or chance I can get in the water I love! I am such a big fan I decided to start this website to review all my favorite products and some others. Hope you enjoy!