How about using an aquarium heater? Those still require 120V but usually have a built-in thermostat ready-made for 80-ish degree temperatures. I'm not sure you can find one that adjusts to 130F though.
Some sous-vide setups are using low-cost 120V immersion heaters for tea cups. I got one...
How did this turn out?
I brewed an Irish Red but used Rahr 2-row instead of the Maris Otter, 1lb Munich and 3oz each of Crystal 40L and 120L. This was my first all-grain and somehow mis-measured my wort volume. OG was only 1.040 and FG finished at 1.005 using WLP002 yeast. It was very...
