I will let you know hopefully very soon. Have not had a chance to boil yet this year. I had a simular setup down at my other place and it worked well. There is a vent at the top of the feed line, after the feedtank and before the stack. The key is to make sure the line is empty or flowing fast enough to prevent boiling. Trail and error is the word of the day. I think this is going to work well with the insulation and the shielding. I should get good heat transfer.