maxi jet 1200 or mag 2 which produces more heat submerged

[markandkristen]

looking to run my cs12-2rc skimmer just trying to figure which one will heat the water more

[SeanT]

Well, a Mag 2 runs 24 watts and an MJ 1200 runs 20 watts,
So I would go with the Mag 2 runing hotter.

[sjm817]

I would say the Mag2 will push more GPH in a feed application than a MJ1200 would. As flow decreases, so does power draw. The Mag2 would probably draw more power, but push more GPH too.

[markandkristen]

i see that the mj will pump right at 6 feet and the mag will pump 7 i am only wanting to push 2.5 feet. and 150 gph.

[sjm817]

150 GPH seems awfully small for a feed on that size skimmer. That is used for small 5" bodied skimmers. Why not just get a bigger feed pump, put a valve on it and adjust the flow? Power usage goes down when flow is decreased. A mag3 throttled to a mag2 level would use ~ the same amount of power.

[markandkristen]

euro reef says closer to 1x the aquarium size mine is a 150 and i will have a 40 gallon breeder that will probably go closer to 20 gallons of usage i guess my big worry is if the pump can handle the head pressure. i know on the maxijet mod they say that the 1200 handles the bigger prop.

[sjm817]

True, but you are also using a skimmer that is far oversized for your system. That 1x - 1.5x is usually more like 300 - 500 GPH since the tank size normally used for that skimmer is much larger. Maybe the 150 GPH will be fine. I dont know. Try it and see. With a small pump, you will only be able to try low flow. With a larger pump, you can try different flow rates.

What is the GPH from the overflows?

[markandkristen]

750 is the max 1 overflow
using a eheim 1262 at 6 foot head

[sjm817]

I would guess the 1262 will do ~ 600 GPH or so. Why would you only put 150 GPH of that through the skimmer and just send the rest back to the display? Wouldn't it be better to try and skim more of what is coming down the overflow? If you are going to use a slow feed, I would use a smaller return pump to decrease display to sump flow.

[kevin gu3]

Back to the original question about heat, regardless of which pump you go with if it is going to be submerged then all the wattage goes to heat (even if by way of friction). So go with the lowest wattage pump that gives you the needed gph.

[sjm817]

I think between the two ~ 20W pumps, you are splitting hairs. The difference would be inconsequential. Neither would add any appreciable heat to the water. I'd measure the wattage on those two Sedras with the mesh mods. The mesh can increase power draw substantially.