Emperor Aquatics Smart UV 40 Watt

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Emperor Aquatics Smart UV 40 Watt
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  • Emperor Aquatics Smart UV 40 Watt
  • Why should I use a UV sterilizer?
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Emperor Aquatics Smart UV 40 Watt

100% Recommend this to a friend (15 of 15)

SKU: 204905

reg. $389.99

Special Price: $331.49

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Quick Overview

Why does BRS recommend this?

When it comes to UV most other companies will recommend a small UV for a large tank which in reality won’t do much more than make your water look a bit clearer.  If your ultimate goal is to keep bacteria, protozoa, and other free floating pathogens at bay there really is no better choice than Emperor Aquatics for UV sterilizers.  With their real world ratings, we have tried other UV sterilizers and really nothing else has come close.  Even though they are a bit more expensive than other brands, their performance makes them worth every penny.

Suggested Aquarium Size: 260 gallon or less

  • Inlet/Outlet: 1.5" Slip Unions

  • Minimum Operational Flow Rate: 157 GPH

  • Maximum Operational Flow Rate: 262 GPH

Emperor Aquatics SMART UV series features a compact space saving design which utilizes a 2" reaction chamber. When used properly UV Sterilizers significantly reduce the chance of encountering disease or algae outbreaks.


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Full Details

SMART UV Manufacturer's Manual

UV sterilizers are most effective as a preventative measure against disease outbreak. While not infallible a properly sized and set up sterilizer will add a significant barrier to disease outbreak. Protecting your system and it's inhabitants will ultimately save money, promote long lived healthy fish and increase satisfaction received from the hobby. Sterilizers can also be used as a component of an effective strategy to current outbreak. Primarily to help ensure the outbreak doesn't re-emerge after treatment. Anyone who has had the misfortune to encounter an outbreak will appreciate the importance of preventive measures against future problems.


Bulk Reef Supply carries only the Emperor Aquatics line of UV Equipment because we feel they are the best UV sterilizers available to the aquarium industry and one of the few brands that offers legitimately sized units capable of fulfilling their claims.


Emperor Aquatics UV Sterilizers are superior to the competition in the following ways:

  • Sterilizers are accurately sized based on contact time, flow rate and tank volume to achieve realistic results.
  • Suggested sizes are based on end of bulb life to ensure continuous results
  • Suggested flow rates factor in the water clarity and UV Transmittance of typical aquariums rather than basing them on purified water.
  • Unique design maximizes the effective contact time by utilizing the full bulb length.
  • Emperor aquatics is trusted by zoos, universities and public aquariums including Duke University, Monterey Bay Aquarium, SeaWorld, Georgia Aquarium, USDA Agricultural Research


40 Watt SMART UV Sterilizer Specs

Model No. Maximum Aquarium Size No. Lamps/Watts Water Flow Rate Algae and Bacteria 30,000 µWs/cm² Suggested/Maximum Water Flow Rate
180,000 µWs/cm² Suggested/Maximum
Input Watts UV-C Output Watts Dimensions (Inches) Inlet/Outlet
02040 260 Gallons 1/40 943 GPH/1574 GPH 157 GPH/262 GPH 40 14 43¾" x 3½" 1½" Union


*Suggested flow rates are based on 80% power or "end of lamp's life" performance

*Maximum flow rates are based on 100% power or new lamp output

*Flow rates consider 90% UV transmissibility



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  • Great Product By Shawn on 10/26/2015

    This thing is big, but very easy to set up. Been up and running for two weeks now and everything looks great. Comes with everything you need for input and output connections. Just need a pump and tubing. I went with the Sicce Syncra 1.5. The hose barbs are 1" so if you want smaller you'll need to get reducer bushings and smaller barbs. Would definitely recommend this product.
  • Water is crystal clear By Michael on 5/30/2015

    After several months of battling a marine ich outbreak I finally got is cleared from my tank and all inhabitants are free of disease. I purchased the Emperor Aquatics Smart UV 40 watt as an insurance policy to help reduce potential for future outbreaks. This is not a guarantee, strict quarantine protocols still need to be followed. I have been very pleased with results, Unit is extremely well made and large. Size helps maximize UV exposure time. Water had always seemed clear to me, but in very short time the improvement was evident. Now crystal clear and everything is healthy. My Powder Blue Tang has never looked better.
  • Excellent By Greg on 2/3/2015

    I purchased this thinking it was an insurance policy on ICK....I was amazed at the water clarity and lack of any algae in my tank. I have since upgraded to a 300 gallon display and will be running (2) 40 watt. I will be soon be ordering another one
  • This is a great product! By Gregafin on 11/18/2014

    i was a tad bit intimidated by this thing because it was a little bigger than ive seen before in stores. after installing this sterilizer my water was at least 10X clearer than the day before. my tank is crystal clear and i feel good knowing im protecting my fish from harmful parasites reproducing in my tank. it also has slowed the growth algae considerably in no time at all. a definite 5 star rating from me
  • Great UV light / Insurance By BBoyter on 7/18/2013

    This review is for the 40watt Emperor Aquatics uv light.

    As many people have said this thing is huge. Comparing it to other uv lights there is no way that other lights work as well.

    Why you should buy:
    Amazing quality
    Clearer water (I didn't have dirty or cloudy water before but I could tell a difference)
    Insurance against disease outbreak (Tangs are my favorite but almost lost one to ick, Now I don't worry near as much)

    What to watch for:
    Make sure the pump you are using is matched to the flow rate for what you are trying to accomplish i.e. just algae control or algae and disease control.

    Other Note. When I received my unit the quartz tube had broken during shipping. While I had ordered many times from BRS I had not dealt with its customer service so I was a little worried. They are better than Amazon. I was worried it would be a problem to get a new one but BRS shipped it fast and I was up and running in no time. I will not buy my aquatic products anywhere else after such a great experience.
  • Very good overall By Turf on 3/26/2013

    Overall this is a solid built product with quality seals. A couple note worthy points that several have already mentioned

    1) It's BIG and would be tough to mount under a 6' tank like I have unless it was VERY organized. To get an idea of how big it is you should stop by Home Depot and hold up a 4" diameter pvc pipe. I placed mine on the floor between the tank and wall.

    2) No mounting brackets come with this unit but you can find them at any home improvement store... there are however not as clean to mount as with the smaller units.

    3) Worth buying a $30 flow meter to maximize the efficiencies of this unit.
  • Well built By Milford on 9/15/2012

    I have the 40 watt unit on my 180 gallon tank. Been in use for about a year now with no problems with the UV or my tank.
    Algae at a minimum and no outbreaks of any sort. UV is super well built and BRS has replacement bulbs stocked. This is my first UV in a system and this one has not let me down.
  • great product, very well built. By jason on 8/19/2012

    just got my 40 watt uv and it is a beast!!!! it is made well and i like the very detailed instruction that came with it. it is very large so you better have alto if room to install it. the quartz leave is heavy duty, and comes out really easy. i didn't give it 5 stars only because it didn't come with any type of mounting brackets or hardware. i feel it should have for the money it costs. i am having trouble finding something that will hold it good, probably just going to make something which slows down install. overall this is a product i would recommend. i will update after a few months of using it.
  • Larger than life By Robert on 2/8/2012

    This unit is huge. I bolted it under the bottom of my 100 gallon tank. My wife got it for me and she thought she had ordered the wrong part be cause of the size and I told her remember we are getting a bigger tank so sweetie you did good. I wish it came with an optional flow meter of a build in one.
  • Its a Big Deal! By David on 11/22/2011

    This thing works great--I had to get a bit creative with the plumbing because it is so big. I run it off a 2nd return pump in my sump. That pump feels my GFO, and Carbon Reactor as well at the UV filter. The discharge from the UV goes directly into the display tank.
  • This thing is really well built with heavy duty, top quality, components By Mark on 7/12/2011

    This thing is really well built with heavy duty, top quality, components. It comes with unions, and all the connectors (slip, threaded, and barbed) to plumb into your system.

    I also like that it’s used by zoos, universities, and public aquariums.

    Be aware this thing is big. It’s roughly 4 feet long and 5 inches round.
  • Excellent Product By Edward on 5/14/2011

    Bulk Reef Supply has delivered again with an excellent product. I am very happy and would definitely recommend it to everyone. Excellent design and superior durability.

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