3 Tips On How To Soundproof a Loud Hot Tub Motor Under 10 Minutes

There are two possible reasons why you would want to soundproof a loud hot tub motor. You are either annoyed by the neighbor’s hot tub sound in the middle of the night or you are simply looking to reduce the noise of your own hot tub and be a good neighbor.

Here is how you could soundproof your loud hot tub under 10 minutes.

Try adding foam, or anything else in between the motor base and the floor. Please do not insulate around the motor. What you want is to eliminate all vibration between the pump and the cabinet.

The hot tub pump itself is not very noisy. Additionally, if possible, you might be able to use wire or strings to actually raise the hot tub pump from its mount, and suspend it in the air. That’s one way to having quiet hot tubs. I will also address some other hot tub noise reduction systems that you can use later in the article. Hot tub soundproofing solves many issues and is generally a broad topic. So let’s go over some options.

Bonus reading

Are You Using Bromine, Correctly?

I have another great article where I talk about using bromine in your hot tub. It’s all pros and cons and FACTS! You want to make sure to just at least glance at it. Read the article here.

Hot Tub Noise Reduction Using Plywood Under The Hot Tub

The first step to hot tub soundproofing is to try using plywood under your hot tub. People have had surprising luck by simply taking a sheet of exterior-grade plywood and placing it under the hot tub. They put the spa back down, and they were all very excited that the sound transmission problem was gone. It also seemed to do great with tying any loose deck boards together. Additionally, it closed off the air spaces between the deck boards that can act as amplifiers: Think of a “sound hole” on an acoustic guitar.

Order from Amazon Today

And this is a great approach since having a cheap price of a sheet of ply, some free time on your end, some wood sealer, and a tub refill, you could sure give it a try. And the big benefit here is, if it doesn’t work for this specific reason, know that you haven’t wasted anything. Because you really want a rock-solid surface if you want to go ahead and put down something resilient.

If you don’t want to bother getting it from a local store, I found this on Amazon for you.

Bonus reading

Expenses – How Much Does It Cost To Run Your Hot Tub Every Month ?

I went into the lengths of research to find relevant data on electricity and water consumption as well as the costs to come up with an average price that you can expect to pay every month when you have run your hot tub. To see what the monthly hot tub cost will be for your area, click here.

Dynamat Soundproofing For Your Hot Tub

This is the best choice that will for sure reduce the noise of your hot tub motor. It is an automotive sound killing material, something like anti vibration mat for your hot tub. They sell this for custom audio and flooring but it helped to solve hot tub noise issues as well.

Here is how it looks when you wrap your car door from the inside:

It’s called Dynamat, and you can check its price on Amazon. Try installing it on the backside of the panels if they are what you think is causing the vibration and/or loud noise.

You can also wrap the inside of the hot tub cabinet and even your enclosure box from the inside. Works really well!

Soundproofing Foam

Have you tried this soundproofing foam? This is the latest that I found people buy to get rid of the noise.

This foam is used in engineering projects to reduce noise by 24dB. If it is good for pipes, HVAC and machines, it will be good for your hot tub. It has two layers of insulations basically, an absorption layer and soundproofing layer.

BXI 2 in 1 Soundproofing Foam -Super Dense Double Noise Insulation Eggcrate Acoustic Foam Panel - 13.4'' X 39.4'' X 1''
  • Size: 13.4''W X 39.4''L X 1''H, Weight: 2 lbs. Waterproof, Heat Insulation. Eggcrate surface for greatly absorbing noise & High density for significantly deadening even low-frequency sound
  • Double Insulation: one absorption layer & one soundproofing layer for double acoustic insulation. Average Transmission Loss: 24dB. Absorption Coefficient:0.74. NRC: 0.75
  • Perfect for engineering projects: pipe, machine, HVAC...
  • Easy to use, can be cut into various sizes easily. If you need to stick it to somewhere, 3M VHB double-sided tape or 3M spray adhesive is highly recommended
  • Please note that foams are newly made and may come with a little smell, which will disappear in time. If you don't like this item, we support 100% refund or replacement without question asked

Acoustic Panels Soundproof Studio Foam 

I found another great thing for you to use if you are having issues with a loud hot tub. These are acoustic foam panels that are usually used in a studio, but depending on where your sound is coming from, and you have a bit more room to fit the foam and not just the Dynamat, you can go for it and give it a try.

If this good enough to soundproof the whole studio, it will for sure soundproof your hot tub.

50 Pack Acoustic Panels Soundproof Studio Foam for Walls Sound Absorbing Panels Sound Insulation Panels Wedge for Home Studio Ceiling, 1" X 12" X 12", Black (50PCS Black)
  • u【Eco-friendly and Safety】Made of high quality environmentally polyurethane foam, these studio foam are durable and effective, no health risks, safe to use.
  • u【Noise Absorbing】Our sound foam panels can dampen and diffuse mid to low frequency sound waves inside of a room, to minimize interference, increases increasing sound clarity.
  • These soundproofing foam panels come with 24 pack in the package, each tile is 1 square foot of 1 inch thick acoustic wedge, 12 pack covers an area of 12 square feet.
  • u【Easy to Install】These studio sound absorbing panels can be used as acoustic cover for walls, ceilings and doors, just easily attach it with staples, nails, screws, tacks or glue.
  • u【Widely Usage】Our sound dampening foam panels are great for recording studios, vocal booths, control rooms, also ideal for home theaters, professional movie theaters, concert halls and more.

Soundproof Box For Your hot Tub Pump

Here is another way for you to potentially solve your issue. The way this approach works is the following. 

  1. First, at the source, try lifting the pump of the slab. Then lay a vibration pad right underneath the pump.
  2. Next, address the path of the noise. While allowing breathing room, get a box enclosure without a lid. Keep in mind that the heater or pump needs a vent. Then go and make a moderate size vent allowing just enough airflow. Then face the vent away from your home. For the inside, the enclosure uses Mass Loaded Vinyl (MLV), absorbent mat and acoustical caulking. Just to help you make it all the way to the end, I found a good anti vibration mat for hot tub for you on Amazon as well. Make sure that the open end of the enclosure faces the slab. Finally, along the edges where the enclosure meets the slab, please glue strips of the absorbent mat to prevent vibration.
  3. Lastly, let us soundproof the receiver. If you do not have a wall, build one as soon as possible. Preferably, make the wall as tall, if not taller than your home. You can also begin to plant trees and shrubs so they can absorb the sound. If it is a case of a particular room that is loud, then address soundproofing the room itself.

All these suggestions are general and meant to be used by most “do it yourselfers.” The soundproof box for hot tub pump usually performs the best.

More Hot Tub Soundproofing Things To Check

I found another case that was successful. Sometimes it’s a combination of different things that are causing the noise and not the hot tub motor itself. Check if any of the following can apply to your problem:

  1. The suction pipe was quite rigid, and it was supported by a wooden block that was attached to the frame of the hot tub next to a side panel. The side panel then vibrated like an acoustic guitar body amplifies a string pluck. The pipe was replaced with a flex pipe and they removed the block. 
  2. Then the discharge pipe was also rigid, connected directly to the heater, which was rigidly plumbed to the filter body. The pipe was then replaced with flex. 
  3. Even though having a plywood base can be a good thing, in this particular instance, the base was causing the issue. The pump was screwed down to a plywood base and making the plywood vibrate like a drumhead. A couple of rubber mounts installed fixed the issue. 
  4. The power cable was jammed up against the equipment door and pump, passing the noise as the suction pipe support did, so zip ties were used to isolate its contact points to the control box only. 
  5. The bonding wires (those are the bare wires running from the equipment to the control box) were coming in direct contact with the hot tub pump motor and rattling. The wires were bent clear of any contact except their attachment points.

After solving these problems, it seemed like a good idea to go one step further and add a weather stripping (single side adhesive) to the contact points right between the equipment door and the hot tub. This will additionally secure the tub against the noise.

Consider Turning The Hot Tub Pump Off In The Evening

Let’s face it, you wouldn’t have any problems if the pump weren’t running at all. While this doesn’t completely solve your problem, I still think it is worth considering again because generally, people don’t want to compromise for the sake of maintaining great relationships with their neighbors. What you can do is to put a timer on so your pump wouldn’t run during the night. 

Troubleshoot The Noise. Maybe You Need To Replace Parts

A general rule of thumb is that the higher quality tubs are the quieter they get. This means that you can certainly expect different noises much sooner from a cheaper hot tub than a higher quality hot tub.  

A lot of this is related to the type and amount of insulation used. If you think noise will become a worry for you, make sure you purchase a unit that has just the right amount of insulation surrounding the hot tub motor.

The following subheadings are all related to sound issues and Dynamat from the beginning of this article is highly effective in suppressing loud, unwanted sounds and irritating noises.

I already shared the link to where you can get it on Amazon. Here it is again so you don’t have to scroll up there.

I Can Hear A Clicking Sound

A hot tub that makes a clicking noise might, in fact, be working just fine. However, when the pump doesn’t turn on top speed, and everything you hear is clicking, or the heater isn’t heating and you hear a clicking sound, they might be coming from hot relays or contactors. If you attempt to find the offending part, do this attentively, together with the power turned away, as a shock hazard could exist.

My Hot Tub is Squealing

A spa or hot tub that makes a squealing noise will usually have a pump that’s nearing the end of a life span. The hot tub motor bearings specifically, finally wear out after quite a few years, and will start to shriek like a banshee!  

The sound becomes increasingly louder over time, and if you don’t fix it, it will lead to hot tub motor failure. To confirm that the noise is really bad bearings, close all valves and remove the hot tub motor from the wet end.

Turn on electricity for a few seconds and if it still makes the noise, then for sure you want to do a complete hot tub motor rebuild from a local motor shop or maybe even replace your hot tub motor, or buy a whole new hot tub pump. 

Softer squeals may be heard coming from open-air intake jets or any spa ozonators. They create a minimal squeal when they are operating which shouldn’t be a problem.

Humming Sounds

A hot tub pump motor may make a humming sound, that is really coming from the motor capacitor itself. Sometimes the humming noise would precede the popping of the circuit breaker. 

Vibrations can be another common source of a spa humming noise coming either from the sub-floor or equipment housed beneath the hot tub. As suggested above, make sure that all equipment is tightly secured, or strapped with zip lines if needed. Rubber patio squares can also be used to reduce the noise.

What’s Buzzing In My Hot Tub

Sometimes the buzzing sound can resemble the squealing or humming sound, and can even be a variation on the clicking sound.

Most of the time the buzzing is caused by a pump or blower motor that is having a hard time starting. In other cases it is a heater contactor or relay that’s causing the buzzing noise.

It is also possible that some ozonators can cause this squeal on them. To be 100% sure about what’s making all that noise, first, go and check your control panel for any error codes. After all, stick your head under there with a flashlight and listen for the noise. It could really be something as simple as a cord leaned against the body.

How to silence a hot tub

Most hot tubs release at least 41 decibels (dB) of sound when multiple operations are running. This ranges from brand to brand, and some can have noise as high as 67 decibels (dB). If you have poor insulation, your tub has a wooden deck, or the control box is loose, the noise could be even worse.

To silence your hot tub, you should first understand the primary cause of the noise. For some, it could be that the tub is too close to the ground. Placing plywood between the tub and the floor could solve the problem. If the noise comes from your pump, using a string or a thin wire to raise it off the surface will prevent the vibrational collision, thus eliminating the noise.

You can also use Dynamat soundproofing, (mentioned above) an acoustic panel soundproofing studio foam, or simply turn off the pump at night. If the noise persists, check that all operatives are working accordingly. Something like as little as a loose bolt can cause a lot of physical disturbance, thus causing a lot of noise.

Lay-Z-spa noise reduction system

Noise can be a massive concern for many hot tub users. Lucky for Lay-Z-spa tub owners, the hot tub noise reduction system comes to your rescue. The system is a comfortable fit and also adjustable for all Lay-Z-spa tubs. It is a stand-alone device, so you can check if it fits in your brand’s tubs as well.

The noise can be quite unbearable when running all your jets at once but placing a hot tub noise reduction system brings about significant changes. Many spas are significantly noisier than Lay-Z-spa, but it helps to know that you can easily have a conversation in your tub thanks to their noise reduction system.

Anti-vibration mat for hot tub

Anti-vibration mats (mentioned above) for hot tubs are a great way to curb the noise you are so sick of. Most of the market options are of good quality, promising at least 95% noise reduction. They come in different sizes with a self-aligning rubber base. This base is thick enough to take care of the situation and absorb the noise. You also get bolt-isolation rubber grommets to control noise produced around the tub’s bolts and screws. One can quickly get a neutral brand option with different accessories.

Inserting anti-vibration mats and rubber noise infusers can be challenging if the tub is full of water. The best time to get them on is when the tub is empty, after your regular cleaning routine or when the tub is new. However, new tub owners are advised to use their tubs for at least a month before deciding they need a soundproof system.

How to make a hot tub quieter (summary)

There are several ways to tone down the noise coming from your hot tub. Here are the summarized tips that you could use:

  • Buy and insert rubber anti-vibration mats
  • Lift the tub’s pump using a thread or thin wire
  • Use spray foams designed to reduce the sound from different tub parts
  • Check for loose pipes and bolts and tighten them
  • Ensure the pump pressure is right
  • Place plywood under the tub
  • Use acoustic panels or Dynamat soundproofing

Ultimately, the best way to solve your problem is by first identifying where the noise is coming from. This way, you will be dealing with a specific issue for a proper solution instead of trying out different methods with no much luck.

How to make hot tub pump quieter

Your hot tub’s pump role is to push water through it to the filters and back into the tub’s bowl. While a noisy pump may not always mean that something is wrong with the system entirely, it would help to identify why the noise is adamant in the system or around its environs. Never soundproof the pump if it has another underlying problem as this will not solve anything.

To make the pump quieter, remove and clean the system to ensure that no debris is affecting its functionality. Look for loose nuts and tighten them. If the pump is too close to the tub’s surface, lift it using a string or a wire piece. This should not affect its functionality if you do so carefully.

Inflatable hot tub noise

Unlike the more permanent hot tubs, inflatable options are not as noisy. The material used to make them are more sound absorbent, thus reducing the noise significantly. However, some people still find the slightest noise quite disturbing. If you need to tone down the pump’s sound, try raising it from the ground or checking for any loose parts.

Alternatively, you can use plywood or any other sound absorbing material between the tub’s surface and the ground. This reduces the contact between the two, thus reducing the vibration that results in unwanted noise. Check that the jets and filters are working as they ought to, as some noise could be a sign of a dysfunction that needs professional repair.

Neighbor’s hot tub humming

Sometimes you have to deal with your neighbor’s tub humming, which can be quite uncomfortable, especially if you are sharing a wall. If your neighbors have a hot tub with a wooden deck, then you are in for much more significant noise problems. Many times, a hot tub’s humming is caused by a dysfunctional airlock. One can quickly notice an error message on the control panel when this is the problem.

The best way to deal with your neighbor’s humming tub is by finding an amicable solution. You can ask your neighbors not to turn on the jets or pump after 9 pm, especially if you have kids sleeping early during school days.

Proper maintenance of your neighbor’s tub should not be of your concern unless you are a regular user. However, if the noise problem is getting unbearable, you can advise them to check that everything is functioning as it should be. If something is wrong, then getting it fixed as soon as possible may be the best thing for everyone.

Alternatively, you could use a high soundproof fence to keep the noise away from your side. This way, everyone is assured of their privacy and comfort.

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Editorial Staff

I'm Adnan Sabanovic, the guy behind Hot Tubs Report. I've had a chance to enjoy hot tubs last few years and have really become interested in owning one of them. Nearly every weekend you'll find me spending time with my family or playing sports. If I am not doing that then I'm here writing about tubs on Hot Tubs Report. This blog is a research for my first hot tub which I decided to document and share publically so others can benefit from it as well.

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