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Need help with variable high powered heating element using SSR

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linux-howto

http://forum.allaboutcircuits.com – Hey guys I have been trying to build a controller to vary a heating element for boiling my beer mash tun. I keep running into issues. 1st issue was finding something that had no Rf interference. So I decided to go with a burst fire SSR. Second was I wanted ease of use so instead of PID I went with a resistive style SSR and a potentiometer. Heres where I am at. I got the unit working but kept wasting SSR's I used a 25A heat sink on a 40A SSR pulling 22A/5500w element. I used thermal paste and a fan. Then I ran into an issue with the fan. I had been grounding the fan to the heat sink. I realize (Embedded)