Closed loop advice

[Ruth]

Originally Posted by BCOrchidGuy

Power consumption isn't usually a big concern, people figure electricity is cheap at 5.5 cents a kilowatt hour but it can add up quickly. That being said I don't know what kind of power some of these pumps use but for sake of argument lets say one uses or is rated at 100 watts. That means the pump has to run for 10 hours to use 1 Kilowatt hour or 5.5 cents worth of electricity which means if you run the pump 10 hours a day 7 days a week you are looking at 100 watts x 10 (hours) x 31 (days) x 5.5 (cents/hour) = $17 a month give or take a bit. That all being said, if the pump is rated at 1000watts um for sure I'd stay with powerheads. I just did a quick search and found a dart that's rated for 3600gph uses 160 watts a Tunze 6100 is rated at 45 watts so the difference would be with the Dart $27.28 per month vs $7.67 per month for a tunze 6100. I didn't check price difference between the power head and the pump but you'd be looking at $20 a month in electrical usage difference between the two.

Doug

Not doubting the #'s just curious why you based it on running a pump 10 hrs a day. I don't know about anyone else but my pumps run 24/7.

I have both closed loops and tunzes on both of my larger tanks (230g and 190g) On the 190 I have the closed loop being powered by a sequence hammerhead - through an OM 4 way and then split into 8 returns. I also have 2 Tunze 6100's. On the 230g I have 2 Tunzes and the closed loop is more basic and is just 2 returns and powered by a Mag 24.
Personal preference for flow and the ability to move and direct flow is definately the Tunzes. If you decide that you want more flow along the bottom of the tank - simple - move the powerhead. Not quite so simple with a closed loop.

When/if I ever set up my 300g cube I am not going to drill for a closed loop at all - all tunzes. the bonus for me is
- I don't have to drill my tank
- less plumbing to try and figure out and hide (plumbing impared)
- no leaky bulkhead that I am currently dealing with on my 110g cube
- I can play around with flow and change it in the future as corals grow or I change the direction I want the tank to go in.

That's just my thoughts