/diy/ - Do It Yourself

Hey brew friends.

I've been brewing all grain for a year and a half with a cylindrical 10 gallon cooler as my mash tun. I want to get greater control of my mash temps so I can multistep mashs. I have cheesing it in the past by adding boiling water in intervals to raise my temperature. However technique is not ideal because you can end up with a thin mash. Has anyone tried to add a pump, heating element and temp controller to their cooler mashtun? I think the heating element would have to be inline with the pump because I wouldn't trust it to not melt the plastic cooler.

pic related, my idea.