Here are a few pic of what I'm working on. I have a lot of 3/32 SS welding wire. I have been using it for electric fencing. I took a 3/4" OD steal rod and wrapped 30 rounds on it. Clamped and heated it so it would hold size. Then I took a 1 1/4 inch pipe and wrapped 18 rounds on it. For the insulator, I used the core out of a water filter that I cut off. The 3/4 screwed right in the inside and the 1 1/4 fit just right on the outside. Using SS bolts for terminals. After running for 4 hours it was pulling only 9 amps. Don't really know how much hho it puts out, but with a 3/8 tube it was getting a good bubble every second.
I gonna mount this in a 3" pvc housing for my first generator.