davelin315 February 5, 2009 Share February 5, 2009 I am contemplating putting a dialed back Mag 18 on a 55 with a large sump, around 30-40 gallons, but wanted to know people's experience with heat transfer as a submersible pump. Anyone use this on such a small system before? Link to comment Share on other sites More sharing options...
Brian Ward February 5, 2009 Share February 5, 2009 (edited) I am contemplating putting a dialed back Mag 18 on a 55 with a large sump, around 30-40 gallons, but wanted to know people's experience with heat transfer as a submersible pump. Anyone use this on such a small system before? My experience with them is that they generate a ton of heat. I use one in a 44-gal Brute trashcan to stir my change water. The change water is always in the low to mid 80's. Makes me want to mount it externally like a recirculating skimmer design .... Unless you're getting the pump for free, I think the eheim pumps run cooler. Maybe mount it externally, that will minimize the heat transfer, but it will be noisier. Edited February 5, 2009 by Brian Ward Link to comment Share on other sites More sharing options...
jnguyen4007 February 5, 2009 Share February 5, 2009 Can we even use the mag pump externally? I heard that it's submersible only. As far as heat goes, I agree. The thing runs hot. I only use mine to pump water from the storage tank to the reservoir. Link to comment Share on other sites More sharing options...
OUsnakebyte February 5, 2009 Share February 5, 2009 Can we even use the mag pump externally? I heard that it's submersible only. They have an O-ring and technically can be used externally. I always use silicone grease for the rings, but, with time, they always start developing the salt crust around the rim. And yes, I think you are going to be fighting heat issues. If you have the means to drill, I would and use some other pump. I have gone through several Mags and now only use them for water changes/transfer. Cheers Mike Link to comment Share on other sites More sharing options...
ctenophore February 5, 2009 Share February 5, 2009 They have an O-ring and technically can be used externally. I always use silicone grease for the rings, but, with time, they always start developing the salt crust around the rim. And yes, I think you are going to be fighting heat issues. If you have the means to drill, I would and use some other pump. I have gone through several Mags and now only use them for water changes/transfer. Cheers Mike Agreed. Why not look at a small pan-world external pump or similar? They are inexpensive and work well. If submersible is your only option, I'd vote for Eheim too. Is this for a school tank? Link to comment Share on other sites More sharing options...
Big Country February 5, 2009 Share February 5, 2009 Can you use a Eheim 1262 for a return pump? I think I saw on the That Fish Place website that the 1262 had a maximum head of 15". I currently use a Mag 12 for a return and it does generate some heat but not too much, was thinking about buying a 1262 until I saw the max head. Link to comment Share on other sites More sharing options...
jnguyen4007 February 5, 2009 Share February 5, 2009 Dan suggested that I use the 1262 as a return pump for my set up. Not only does that put out very little heat, it's also very quiet. Link to comment Share on other sites More sharing options...
Amuze February 5, 2009 Share February 5, 2009 My Mag doesn't get hot. Link to comment Share on other sites More sharing options...
Brian Ward February 5, 2009 Share February 5, 2009 Dan suggested that I use the 1262 as a return pump for my set up. Not only does that put out very little heat, it's also very quiet. Looks like 4m is the max head for the 1260 and about 3.5m for the 1262: http://www.eheim.com/base/eheim/inhalte/in...tail_27591_ehen Link to comment Share on other sites More sharing options...
jnguyen4007 February 5, 2009 Share February 5, 2009 http://www.eheim.com/base/eheim/inhalte/in...tail_27591_ehen Holy, I didn't realize the price of the Eheim replacement impeller is $85. That's not cheap. Link to comment Share on other sites More sharing options...
davelin315 February 5, 2009 Author Share February 5, 2009 It is for a school tank. We have an undrilled sump and a mag 7 as the return for it right now. The tank is still empty and I was going to see if someone could help me drill it so that I can hook up an old Dolphin Ampmaster 3000 to it with a 1.5" bulkhead, but then I remembered that I have a Mag 18 from another donated system that I could use and avoid drilling. I'm not sure of the sump is tempered or not. I think that I will avoid the Mag 18 for the time being and work on drilling the sump instead. I can easily dial back the Ampmaster so that it is not pushing too much water through. We're probably going barebottom in this system to ease the maintenance (might end up with a DSB, though) so this would be a good choice due to how quiet a pump it is as well. Link to comment Share on other sites More sharing options...
jamesbuf February 5, 2009 Share February 5, 2009 I had a Mag 24 driving my manifold system and when I switched to a Dart, I saw a significant temperature drop. I also saw a decrease in evaporation loss since the temperature controlled fans were on alot less. When you get into the Mag 12s and above, there is definitely a huge amount of heat transfer. Link to comment Share on other sites More sharing options...
Brian Ward February 5, 2009 Share February 5, 2009 I had a Mag 24 driving my manifold system and when I switched to a Dart, I saw a significant temperature drop. I also saw a decrease in evaporation loss since the temperature controlled fans were on alot less. When you get into the Mag 12s and above, there is definitely a huge amount of heat transfer. I have either a 24 or 36 that I was using for a while to stir my new saltwater. Temperature would easily get in the 90's or 100's if I left it running too long (overnight or a couple of days). Link to comment Share on other sites More sharing options...
extreme_tooth_decay February 6, 2009 Share February 6, 2009 They make a crazy ridiculous amount of heat, Dave. One time I left 1 or possibly 2 MAG 18s in a 5 Gal bucket with about 4 Gal of water in it running 12 hours in vinegar. When I reached my arm in, I got burned. I'd estimate the water was 180 degrees, and dissipating a lot of heat to the surface. Up to my elbow was bright red for at least a week from being in the water less than 2 seconds. I have a pic of that somewhere. Yeah, it was only 4 gallons, but I was amazed how hot it got just overnight one time. tim Link to comment Share on other sites More sharing options...
davelin315 February 6, 2009 Author Share February 6, 2009 I figured as much since my Mag 9 that I use for mixing usually shoots the water temp up to around 100+ degrees in the 44 gallon garbage can. Link to comment Share on other sites More sharing options...
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