Programming my heater/ fan is seriously startung to hurt my brain...


New member
Hey guys,
I have been working on dialing in my temp on my tank and it's starting to hurt my brain. I am FOR SURE over thinking things.
I have a BRS heater that's supposed to control to a .3 degree variance that I would like to lean on for temp control. And an apex that I would like to use as a backup/ failsafe.
And a fan to cool things off if it gets out of hand.*

Ideal temp is 78.

What should my heater and fan programming be?
A 1.25 degree variance is acceptable. And as i said I would like to rely on the brs heater for most of it. I want the apex outlet to cycle as little as possible.

Vinny Kreyling

Premium Member
First you will have to get the heater set where you want it to be 78.
Then set the apex slightly lower to turn ON, say 1 degree.
The same with a higher temp to turn OFF.
Fans on @ 79.5
This is how I would do it.


New member
I remember reading a post on another forum forum with some users saying they cannot get the advertised .3deg hysteresis from the BRS heater. I suggest you do a search but I remember the discussion. Just keep that in mind as you may need to set it for a higher swing. (BTW I don't own one, this is just FYI)


Premium Member
Here is what I use for my fan in the summertime:

Fallback OFF
If Tmp > 78.5 Then ON
If Tmp < 78.0 Then OFF
If Tmp < 70.0 Then OFF

In the winter, I plug in my heater to the outlet where my fan was plugged in and adjust the programming to:

Fallback OFF
If Tmp > 78.5 Then OFF
If Tmp < 78.0 Then ON
If Tmp < 70.0 Then OFF

I will be the first to admit, I'm not the greatest programmer, but these work for me.