Product review (1 stars): After 3 weeks of phone calls and emails...
I tried several times to add insulation and help the grain father retain heat. Sadly, without the lid, the temperature dropped lower than boiling within 3 minutes. I was brewing inside. It might work inside at Colorado/Wyoming elevation. If you need to hold a boil over 208F, I would not recommend the grain father.

The manufacturer did not admit any fault and suggested that I buy another of their products to add insulation.

Building a machine meant to run at 220V and then reducing the power for 110V outlets doesn't make sense to me.