Octo Strong Magnetic Aquarium Heater Holder

(36 customer reviews)


Don’t fall for wimpy magnets!  I revolutionized the usage of high-powered magnets in our industry!



Let’s face it….suction cups, well, suck! And then they pop off. That’s why my products feature super strong neodymium magnets. One thing that always bothered me about heaters is that they come with suctions cups that eventually stop doing their job. Well, now you don’t have to worry about that. These Octo Strong Heater Holders™ are made from 1/4″ clear cell cast acrylic, will hold on glass up to 3/8″ thick and feature o-rings made of a material that can withstand the elements of a saltwater tank.

  • Available in both single and double configurations, for standard round heaters (up to 1″ diameter) as well as the flat Cobalt Neo-Therm heaters.
  • Will work titanium and plastic covered heaters as well!
  • External magnet can be submerged!

Approximate sizes:

Double Round: 5″ wide x 5″ tall x 1 3/4″ deep
Single Round: 5″ wide x 2 3/4″ tall x 1 3/4″ deep
Double Cobalt: 4 1/2″ wide x 2 3/4″ tall x 3″ deep
Single Cobalt: 4 1/2″ wide x 2 3/4″ tall x 1 3/4″ deep

External magnet needs about .625″ for clearance.

(Heaters not included)

I use N52 neodymium magnets. Rare earth magnets are not reef safe on their own, so I fabricate custom acrylic pods that encapsulate the magnets and keep them away from your water. Please visit the magnet warning page for more information on these magnets.


My products are made to order, custom! Please allow up to 10 business days for fabrication time for most products. Because my products are made to order, fulfillment time can rarely take longer. Full custom orders can take up to four weeks to complete. Please let me know ahead of time if this may be an issue. Shipping prices listed are to the contiguous U.S. Please contact me if you live elsewhere and want a shipping quote. Because my products are handmade and/or hand assembled, there may be small irregularities (fingerprints, marring, hair, etc) which will not effect the performance of your product.

Additional information


Round, Cobalt


Single, Double

36 reviews for Octo Strong Magnetic Aquarium Heater Holder

  1. Amanda Cerrato (verified owner)

    So far so good!! These magnetics are CRAZY STRONG!!!! I purchased 2 of these holders to use with 300w Titanium heaters and so far I’m very pleased with them. I was sick and tired of suction cups moving around & “un-suctioning” during tank cleaning time – not an issue anymore! Thank you!

  2. Mike S. (verified owner)

    simply awesome! helped organize and maximize the space in my sump. magnets work great!

  3. Ryan Fletcher (verified owner)

    Magnets don’t move heaters stay in place. Very happy with it

  4. Robert Paterson (verified owner)

    Best way to keep your heaters lined up.

  5. Amanda C. (verified owner)

    Love this holder – I’ve ordered 3 from Matt and they all function perfectly. I use titanium heaters in my Discus tanks and was concerned about the temperatures melting the plastic but I haven’t had one issue. My tanks are set anywhere between 82F-90F and have not had one issue with the holder warping or melting. All 3 holders are still in perfect shape after almost 1 year of use!

  6. Amanda C. (verified owner)

  7. Brennen (verified owner)

  8. Anonymous (verified owner)

    Great product. Well built and the magnetic is strong to hold 2 heaters.

  9. dennis (verified owner)

    Great product. Strong and quality made.

  10. Anonymous (verified owner)

    Great Stuff Solid Practical Funtional

  11. KEVIN (verified owner)

    Fast shipping!

  12. Dirk (verified owner)

    Great product, well built, customer service excellent

  13. Clarence (verified owner)

    Works great with 2 BRS titanium heaters!,,

  14. Debbie Grissom (verified owner)

    High quality item. The magnet is very strong. Very pleased with my purchase!

  15. Justin (verified owner)

    Ridiculously strong magnet, and everything stays nice and snug in my sump.

  16. Erik (verified owner)

    Amazing for my sump, have two titanium heaters in it and hasn’t moved from where I put it, and running 4000gph over them!!!

  17. Mark B. (verified owner)

    Strong Magnet, easy to use, quick shipping. will buy another when needed

  18. Alex S. (verified owner)

    I have one for my Cobalt heater and a round one for an Eheim heater. Makes life easy. Beautifully constructed and zero worries about the magnet. That’s all I can ask for.

  19. Alexx LeVasseur (verified owner)

    I love these heater holders. I had some that were by a big manufacturer and although they were acceptable they limited how big the heater could be so I had to remove my titanium heaters from their sleeve in order to force them to fit. This one allows for various sizes and I am able to keep my heaters in their sleeves. Another thing they are useful for is on my freshwater tanks I have changed the output of my Fluval FX6’s and 4’s to use spray bars and the rubber stoppers that held them in place were forever sliding and breaking down overtime causing black sludge rubber pieces…it was gross. These heater holders are perfect for holding the spray bars in place. Great product and quality!

  20. Bennett (verified owner)

    Top quality, superb communication.

  21. Jeffrey S (verified owner)

    Holds my two titanium heaters perfectly, very nice quality and machining. Super fast order turn around and shipping
    Thanks for a great product

  22. DONALD CHESSER (verified owner)

    Very awesome product! It keeps my heaters perfectly in place in my sump. Great quality as well. I’m now ready to see any a lid from this company too.

  23. Kye G. (verified owner)

    Awesome product. Fast service.

  24. John (verified owner)

    Works as advertised. The external magnet is large, not a negative as it definitely holds the heaters. The size does limit where it can be placed. Stock Red Sea 525XL sump does not allow for the heaters to be placed in the rear compartments due to the lack of space between the sump and cabinet wall. This is not a deal-breaker just need to plan ahead. Thick acrylic and bands are strong. Worthwhile purchase.

  25. John Kiernan (verified owner)

    Great product simple design and the strongest magnets I’ve seen used. Held great on my acrylic sump.

  26. WILLIAM L. (verified owner)

  27. Troy C. (verified owner)

    Great heater mag mount , tight firm fit in sump for my BRS 600w titanium heater. Very secure magnet connection. I have tried several mounts and octo has the best one out there. Nice heavy duty build . A+++

  28. Steve B. (verified owner)

    Awesome product. Just what I wanted

  29. Anonymous (verified owner)

    Solid Product from a solid company!

  30. Rodney C. (verified owner)

    This is a great product, the quality is amazing. It is exactly what I needed to secure my heaters in place.

  31. David (verified owner)

    Ordering process was painless. Product arrived very well packed and great quality craftsmanship. Magnets are extremely strong and sealed well. Very happy I ordered this to fit my heaters in my sump and be properly wire managed.

  32. Joe W. (verified owner)

    Love these guys products, top quality!!

  33. Kevin T. (verified owner)

    I am very happy with the dual magnetic heater holder. Excellent quality. I have peace of mind knowing my heaters are exactly where I mounted them and not floating around because the suction cups didn’t hold. Spend a few extra dollars and save your aquarium from disaster. Thanks Octo Aquatics!

  34. Tammy Mcgrath (verified owner)

    Very happy! Well made and fits my two 300w heaters perfectly.

  35. William W. (verified owner)

  36. James Adams (verified owner)

    Good value for the price. Holder is well made and magnets hold strong. I don’t have to worry about heater not staying in place anymore

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