The new 15amp model works great in my older kitchen. Before when it was 20amp, I was hesitant to buy the Duo. Now, I can steam directly after I pour my shot (I haven't tried it simultaneously yet as I prefer to watch my shot). If you're thinking of getting a dual boiler, consider getting the Duo. The Duo Plus is not a better value, but it's nice to have the added extras!
Thank you, Taha, for your suggestion and excellent service! You're the best!!