Thermostat controller vs heater without it.

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10Gallon

Aquarium Advice Regular
Joined
Jan 22, 2018
Messages
99
Location
Houston Texas
I've noticed when using a heater without a thermostat controller, the temp fluctuates more. In my 10G, with the Aqueon 50 watt, the temp would go up and down about 3-3.5 deg every couple of hours. Other heaters I've used were like that maybe not quite as bad, though. I got a Finnex analog controller and with that heater the tank stays within a degree. Why does this happen?
 
Either the tank gets exposed to temps too cold for the heater to keep up or the heaters are undersized or crap ? I only use Aqueon Pros and have no issue with any of my tanks . I keep several at 86f ! I have over 30 of them . They have lifetime replacement guarantee so I wonder why others buy different heaters. I know many people who have got a free heater from Aqueon by just emailing them when there heater died ...The preset heaters are no good IMO especially if you have a tank 10g or bigger as it does not have any way to account for tank volume.
https://www.google.com/url?sa=t&rct...df.pdf?la=en&usg=AOvVaw02bPgvYtYyYMVHePKPEjEJ
There is a page in the directions above that will tell you how much an Aqueon pro can raise the tank temp above an average room temp of 68-72 by size of tank and heater.
It is the most useful way to know what size heater you really need.
I by all my heaters on line usually from amazon or Ebay for well under 1/2 the price stores sell them for .
 
I know it's not that the heater is undersized because the same heater performs well when used with the controller.
 
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