Hot Tub Jets - Polyjet bodies from Waterway

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All about DIY Hot Tub Jets

Do I need Jets in my tub?

This really comes down to personal preference. For me, I think the jets are really parts of the whole experience. If you don’t have jets, then you really have a soaking tub rather than a hot tub – again, in my humble opinion of course.

Also, if you are going to go to the trouble and expense of building a hot tub – surely you want it to be as good as possible? I’ll let you decide on this one.

However, if you don’t opt for jets, you are still going to need some hot water returns for the tub to send the hot water from the heater back into the hot tub. Swimming pool returns are not jets – just so we are clear on this.

Are the jets the same as a plastic shell hot tub?

The jets that we use in our DIY Hot Tubs that are block, concrete or ICF built are a little different from the jets you get in the plastic shell tubs. They may look the same, but the internal parts will be different.

This is really to do with the system that we use on these builds which is Gunite Jet Bodies. I have a full article and explanation of these here.

If you are building a stock tank hot tub or an IBTL tub, then the jets that you use will be the same as on a plastic shell how tub. Again, this relates to how the jet bodies screw into the holes in the tub.

How do DIY Hot Tub Jets Work?

Hot Tub jets work by combining air and water and then delivering this mixture into the hot tub. Depending on the type of jet, directional, roto, twin roto, massage etc, the mixture of air and water comes out slightly different.

Some hot tub jets also allow you to control the flow by turning the face of the jet. This reduces the amount of air and water in the jet so you can control the flow and intensity of the jets.

Are they Interchangeable?

As I have mentioned above, there are different types of jets available. However, you are only able to interchange jets from the same manufacture and the same jet “series”. For example, I use Waterway Poly Storm jets on my builds.

These are not interchangeable with Power Storm or Poly Jets for example, despite looking very similar and coming from the same manufacturer – they do not have the same fittings. It also goes without saying that you cannot interchange models from other manufacturers, they are very specific to the type of housings that you have on your tub.

How Many Jets Can I have in my Tub?

The number of jets that you can have in your DIY Hot Tub really comes down to the pump and the flow rates. What is a little different for concrete, block or ICF built hot tubs is that you tend to have a smaller number of more powerful jets. Plastic shell tubs often market themselves on having 100s of jets. This is not the case on our DIY Tubs.

For example, all of my designs in my store are built around 14 or 16 jets – why is this? Well, in short, it is about the flow rates. If you take a regular hot tub jet pump, something around the 3HP mark, it will output around 200 gallons per minute at full power.

Without going into too much detail here, every bend, twist, fitting and distance from the control room to the hot tub reduce this number as TDH or Total Dynamic Head increases.

Each of the jets that I use in my build require a flow rate of 10GPM to operate. This means that if I have 14 or 16 in the build, then I need 140-160 GPM from the pump. Whilst of course an accurate calculation of TDH can be done, by allowing a little extra room in terms of flow, I know that with a 3-4HP pump there will be enough flow in most normal cases.

Therefore, if you are looking to increase the number of jets, then you need to add a second pump to the system. Just increasing the pump size is not the best way to do this and this would only allow a couple of extra jets. If you are looking for around 30 for example, then you need to have a two pump system.

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