Just trying to think outside the box here but we need to heat water moving through a pipe electrically. I realize resistance heating would likely be the most economical and efficient but the issue is having to open the pipe and build a device to run in series in the pipe to heat the water. I am curious if anyone has thoughts on an inexpensive non-contact solution similar to microwave? I want to say RF will be rather involved and will require a rather large boost transformer to obtain our target 1000W power input.