Heaters in sump and Water Change

  • We are currently upgrading MFK. thanks! -neo
I usually turn everything off. If the heaters are on above water they could over heat and shatter. If they on under water it while you do the change it could help get the temp were you need it.

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Did my first water change. Temp @ start 80F. After draining 40g water 77F. After refilling with 69F tap water 75F. Started sump pump and FX5. After 15 minutes, water temp was 78F.

I figure around 10-12 gallons of 80F water returned to my sump on shutdown. Didn't get a water temp before I started pumps back up. Next time I will. I don't think I will have a problem doing it this way.
 
Assuming your heaters will turn off when hitting the correct temp you want there is no problem? The heater will probably be off the whole time anyway. 35 gallons will be easy peasy to heat to 80f.
 
+1

aldiaz33 said:
Since your temp sensor is in the display and heaters are in your sump, the sensor will keep the heaters running and your heaters will fire up until they hit the Jager's internal thermostat's set point. Therefore, you should set the internal thermostat on your Jagers just a few degrees above what you have your temp controller set to in order to avoid cooking your bio.

But in addition to what I wrote above, I would move your temp controller's sensor...
I would recommend placing the temperature controller's sensor near the drains in your sump. If you have baffles, place the temp sensor where water enters your sump and place your heaters in the compartment where your return pump is located. This is the safest way to set up your heating system. If you think about it, placing the sensor in this location places it at the farthest point from water that has recently been heated, ensuring that your water column is being heated evenly.
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