I know there is alot of equipment new with copper in them. I think Leader was still making pre heaters with your choice of copper or stainless until last year or the year before. I know the Vermont Maple Sugar Makers' Association is pushing bulk buyers to not buy from producers that are not certified. I feel like a Farmer with 35 cows not enough money and too much work.
Blaisdell's Maple Farm
started on a 2x2 pan in 2000 and now
custom built oil fired 4x12 arch by me
Thor pans Desinged by Thad Blaisdell
4600 taps on a drop flue 8-4 split