External heaters

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Hi
Upgrading shortly to a trigon 350ltr tank. Will be running a fluval fx4 canister filter to aid water changes.
Im looking to use an External heater. Looked at hydor but they only cover to 300ltr. Struggling to find others with reviews.
Can anyone assist
Thanks

fr499y

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Reply #1

by the time rock/sand is in the tank, you'll probs be under the 300L mark anyway! :)

ajm83

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Reply #2

Maybe you could use two smaller ones in series?

Mike

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Reply #3

Maybe you could use two smaller ones in series?

That wouldn't work, the first would raise the water's temperature above that of the 2nd's kick-in point. They'd have to be run in parallel.

As said though, 1 should be sufficient unless you like your house particularly cold.
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ajm83

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Reply #4

That wouldn't work, the first would raise the water's temperature above that of the 2nd's kick-in point. They'd have to be run in parallel.

You're right. It took me about 20 re-reads of your post to get my head around that.  lol 


14tod

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Reply #5

Thanks for advice so far
I appreciate water levels will reduce with live rock etc but prefer to run well within parameters rather then at the edge of limits to avoid overworking the unit.
May have to settle for within tank.
Will keep researching

Mike

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Reply #6

In tank heaters come with their own risks, such as inverts climbing on them and being burned and or dying from the heat.

It’s another benefit of sumps, it keeps it out of harms way.
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Reply #7

I don't see running the heaters in series being a problem , if one is coping with the heating demands the second won't kick in saving electric , the second would only run when the first isn't coping and isn't able to achieve set point .
If run this way I'd be inclined to swap them over every couple of months to give even running .

Mike

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Reply #8

I don't see running the heaters in series being a problem , if one is coping with the heating demands the second won't kick in saving electric , the second would only run when the first isn't coping and isn't able to achieve set point .
If run this way I'd be inclined to swap them over every couple of months to give even running .

The first heater is always going to be able to raise the temperature at its output higher than the kick-in point of the 2nd heater, even if it's not able to heat it sufficiently to keep the tank up to temperature.

The heaters don't output water at the temperature you want the tank to be, they overheat it, so that heat distributes around the tank as it's being lost constantly too. If the output from the heater was 26C, the tank would go cold, unless the flow through the heater was massive.
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Gav

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Reply #9

The flow through the fx4 would be quite substantial hence the reason I feel they would work in series .  I think that with the flow over the heaters being quite substantial that the heater would not give the same instantaneous effect possibly given at lower flow rates .
Should they be run at lower flow the stats on the heaters would need to be set in a 'lead' and 'lag' setup with the second heater set to desired temp being the 'lead' and the first set lower by a degree or two being the 'lag'.

14tod

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Reply #10

[/img]
That wouldn't work, the first would raise the water's temperature above that of the 2nd's kick-in point. They'd have to be run in parallel.

As said though, 1 should be sufficient unless you like your house particularly cold.
If running in parallel, do i simply have a splitter before the heaters then return to a single pipe after tbe heaters.
Would this have any down sides.
Thanks





Last Edit: Nov 5, 2018 8:03:19 pm by 14tod

Mike

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Reply #11

I'd say so. There'd be no way to make sure water is going through both equally, but providing the pipe diameter and lengths are all equal, it should be pretty even.

With them in parallel you should be able to fine tune them to be "in sync" more by observing one kicking in before the other, then adjusting the other a tiny increment, and so on.
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fr499y

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Reply #12

Or just split it using a Y jointer, and running two returns to the tank both with inline heaters :) no real need to go 1-2-1.


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