Eheim 2164 Pro Filter Question re Heater

[Nexstar]

I have a new Pro Eheim filter with the heater built in. Very nice, super quite and efficinet filter. Having the heater built in is great. What I am having problems with is the heater.
Bear in mind it may not be the heater it may be me.
The thermostat has a digital reading and appears very accurate. It also has a centagrade scale and I want the temp to be 26C.
When doing my initial setup I set it at 26c on the scale. The tank was slightly above that so naturally I did not expect it to run and it didn't. This morning it was about 1 degree F below where I wanted it so I moved the dial up and I saw the heater come on when I had the dial up to 28C. It stayed on as I lowered the dial until about the 27C mark. Then it went off. I know some of these scales can be well off the mark as only a guide. I then turned it slightly up from that mark and it has remained off, not attempting to raise it any. Should I move it back up till it starts and then barely move it down or what.

Thansk
Bob

 

[ryansfish5g]

I can't help you with your question, but that is an awesome filter.

Mind telling me how much it was and what size tank you are running?

 

[Nexstar]

It was about $240 and I have a 25g I am using it on. I am however reverse flowing it under a UGF further I choose it because it left one less piece of equipment out of the tank.

Thanks
Bob