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Calibrating a Heater

frothhelmet

Member
Joined
1 Mar 2010
Messages
443
Location
USA / London
I have a super old Hydor Theo 50w that I just bought used off of ebay. Problem is, it is either broken or totally miscalibrated as I now have it set at 18C (lowest setting) and it is keeping the tank at 25C.

Is there any way to calibrate a heater? There appears to be a little button thing on top of the dial, but I don't know what to make of it...here is a picture of what I mean, the little button thing is the black dot on top of the dial...

http://cgi.ebay.co.uk/HYDOR-THEO-SHATTE ... 33521325b0

BTW, there is some moisture on the inside of the glass tube, is this combined with its miscalibration a signal that I am tempting the fates by using it? (HT a1matt :thumbdown: )
 
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