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JBJ NanoZapp 3 Watt Inline UV Sterilizer


Item #: JB4171

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JBJ introduces the smallest inline ultra-violet sterilizer to date. This miniature version was specifically designed for eradicating harmful micro-organisms and unattractive green free- floating algae in fresh & saltwater aquariums less than 30 gallons.

This revolutionary UV sterilizer/clarifier is completely submersible, which can be placed discreetly behind the filter walls of most nano aquariums without ever being seen.

The NANOZAPP™ utilizes a UV-C G3.5 bi-pin lamp that is encapsulated in our unique Quartz Sleeve that is air tight and allows for a 99% transmission rate to efficiently neutralize disease causing pathogens. Simply….connect to your existing pump and you are ready to go!

  • Model #: MT-NZ3
  • UV Lamp: G3.5 Bi-Pin (3 Watt)
  • Volts/Hz: AC110V/60Hz
  • Pump Flow Required: 100 – 225 GPH
  • Aquarium Capacity: 30 Gallons
  • Life of UV Lamp: Aprrox. 5000 Hours
  • Wavelength: 253.7nm
  • Dimensions: 8" x 1.5" x 1.5"

Manufacturer information

JBJ is a top-of-mind brand name in freshwater and saltwater aquarium supplies. The company is committed to innovation and manufacturing only the absolute highest quality equipment. JBJ’s philosophy is "to create products that provide extra value" to hobbyists. JBJ produces hundreds of aquarium products including lights, filters, heaters, UV sterilizers, wavemakers and top-off systems. The company is best known for their affordable line of Arctica chillers and the best-selling Nano Cube aquarium series. We carry the gamut of JBJ products and accessories and are happy to provide you free technical support while you’re setting up your new equipment.

4 Stars


Reviewed on
January 14, 2021

Yes, I would recommend this.

Great product for the price

Pros: Price

Cons: None

After reading the reviews,I went ahead and purchased the nano zapp,even though people complained it leaked. I decided to seal the housing and attached points with plumbers tape. So far no leaks! Hope this helps.

Was this review helpful? 1 0


Reviewed on
May 13, 2017

No, I would not recommend this.


Pros: Small

Cons: Cheap

This can not be mounted externally inline filter. It leaked ware to two bodies screws together. It works great fully submerged like advertised. I still think it's cheap and low quality.

Was this review helpful? 0 2

harold lane

Reviewed on
March 24, 2016

No, I would not recommend this.

Be Careful in Ordering

I have searched many brands of 3watt UV Sterilizers. I was convinced that the JBJ would not leak. I just wanted to alert purchasers that please make sure you are receiving the correct product seen on the add you are purchasing. I purchased the JBJ from another merchant and was sent the Nano Zapp.It does not appear like the picture on the add. This product leaks badly and to the point that the bulb will break at the contacts. I went to the point to have a plumber look it over and saw that the seals are useless and of course an electrical danger. I know I will stay with purchasing from Marine Depot. I see many good reviews but maybe they could share how they corrected any leak problems.

Was this review helpful? 0 4

shaun elliott

Reviewed on
January 16, 2015

Yes, I would recommend this.

Could not be happier!

I had an algae/bacteria outbreak in my tank that clouded it up so much that I could barely see two inches inside (24 gallon nano). I installed this on Monday and 5 days later my tank is crystal clear. I could not be happier with my purchase!

Was this review helpful? 5 0

brian pimentel

Reviewed on
November 13, 2014

Yes, I would recommend this.


The ends are not accurate 1/2" fittings. They are a tiny bit smaller. The included 1/2 ID tubing is too loose.

Was this review helpful? 2 0

matthew gaboras

Reviewed on
June 17, 2014

Yes, I would recommend this.

UV sterilizor

This product is amazing

Was this review helpful? 0 0

tj atwood

Reviewed on
April 26, 2014

Yes, I would recommend this.


Great product. Very easy installation

Was this review helpful? 0 0

fred oehmke

Reviewed on
March 26, 2014

Yes, I would recommend this.

Seems to work

I have always found it difficult to review UV sterilizers because they are usually running internally and makes it difficult to evaluate. That being said, this model seems to work ok. I noticed that the fittings and piping provided are fairly loose fit. I have this hooked up to a MJ1200 in my JBJ28 nano cube. I realize this is a bit over the recommended flow rate, but I have noticed that water leaks out near the fittings where the hose does not fit tight. The light does turn on, so I assume it is doing its job. This does increase the temperature in the tank a bit. I have it running only at night for this reason. For a nano JBJ28, I don't think there is a better product on the market. Thank you MarineDepot for the quick shipping.

Was this review helpful? 3 0

thomas welch

Reviewed on
February 20, 2014

Yes, I would recommend this.

UV Sterilizer

Unit arrived as indicated in good shape, installed in a few minutes it works as indicated by manufacturer. Recommend this product for other Nano Cube owners.

Was this review helpful? 0 5

phillip russell

Reviewed on
February 15, 2014

Yes, I would recommend this.

Jbj 12

I purchased this to use on my Jbj 12 nano cube. It's was way to long to fit like instructions said to install. I guess it's only for the jbj 24. Plumbing it was a pain. If you have the 12 nano I'd look else where.

Was this review helpful? 1 0

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