Tunze 1073.05 used externally?

[Ikiwi]

Hi - this is my first post on reefcentral. :spin3:
I am looking to replace an external Velocity T4 return pump, which while very quiet, is pumping an incredible amount of heat into my system (70G cube + 30G sump). I am interested in converting to the Tunze 1073.05 but I have a couple of questions before I commit.

One - the product manual states it can be used externally, although no directions are given on how to set it up in order to plumb the inlet to the sump. Can you help please?
Secondly - does it run quietly when used externally (as opposed to "in-sump")
Thirdly - how much heat does it put out.

Your help is much appreciated. Thanks.

 

[rvitko]

You just pop off the front cover and thread in a nipple that is included for external use.

I have never run one externally but assuming there are no air bubbles or plumbing issues it should be just as quiet.

It uses only 43W at full power, it will heat 100 gallons of water about 1 degree.

The T4 does have a much higher head rating, after 4ft of head the flow of the 1073.050 will be about half of the Velocity T4, just keep that in mind.

 

[Ikiwi]

Thanks for your help. Seems straightforward.
I only have about 2 feet of head, so I think I should be OK and be able to maintain sufficient flow. The T4 is almost too much for my system anyway and has hiked the temperature up 7 deg (Farenheit)!

Cheers.

 

[geniari]

rvitko

I would like to use one of these pumps for my 75 gallon return. I need the pump to be silent and add little heat so I want to go external. I have 4.5 feet of head and two 90's. My question is, what kind of flow would I get with 1" or 1.25" pipe. I want to get about 500-600 gph if possible. Would I need two pumps to achieve this rated flow or do you recommend a different pump?

Phillip

 

[rvitko]

A water cooled pump vs an air cooled pump like an Iwaki, will add the same amount of heat externally as it will internally. This pump uses a max of 45W so any added heat is quite negligible, 45W will likely raise the temp of your 75 about 1-1.5 degrees and unless you go with an aircooled external pump, you likely wont do better. If there is any difference it will be on the order of a fraction of a degree (1-3/10ths would be my guess) between this pump run external or internal. It is the water inside the pump that takes the heat, you will likely notice most pumps don't feel warm on the exterior. This pump is set up for 3/4" plumbing and will do about 550gph at 4.5ft and 24V, however, I can't answer for 1", my guess is this will result in some loss of flow, there is more water weight as backpressur and the walls of the plumbing act almost like a ladder for the water to climb, while smaller plumbing has more resistance, it also has more force to hold water in a column, imagine climbing a well, if you can barely span the walls of the well, there is much less to grab onto and if you slip, you will slip much farther, much faster than if the well is narrower and you can easily brace yourself. In this case I would probably suggest finding an air cooled external pump set up for the correct size plumbing out of the box. Of course air cooled pumps make more noise.

 

[geniari]

Roger,
Thank you for that info. I like the water well analogy. I think this pump might work out well since it is above 500gph at 4.5 feet. I'll stick with 3/4" plumbing to allow for this. I have not seen any bad reviews and the silent operation is very important.

How much flow do you think the 1073.02 & 1073.04 will have with the same head?
Is there a higher volume controllable version coming out?

 

[rvitko]

1073.020 is only about 250gph and 1073.40 is about 450gph. A larger pump requires a major redesign, which will likely happen someday, but nothing is likely this year or next. The 1073.050 is essentially a 1073.040 with a 6105 motor in it.

 

[geniari]

Roger,

Thank you for the info and quick reply. I think either 1073.04 or 1073.05 will work great. Also, I have read mostly good things on both especially the silent operation.

 

[Ikiwi]

Roger - some follow-up feedback as an FYI. I have now plumbed a Tunze 1073.05 external to the sump (replacing the Velocity T4), running at it's max the flow is more than enough for my 70G cube, it's dead quiet and is not putting any heat into the system. I am very pleased with the outcome.

Cheers, Ikiwi

 

[rvitko]

Thank you, that is good to know, but I would be certain it is adding some heat, but it is likely around a degree so it is minor.