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Water Column (differential pressure)

I second StRacerDuke’s opinion on the HTP 221. I’ve had mine for several years and it hasn’t let me down. I’ve got the 220 only model with water cooler. It was great ordering from the company because I could get exactly the torch and accessories I wanted. I haven’t used any of the others so...

Another option: https://www.amazon.com/gp/product/B07Z13G1P5/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1 This device can either share a 3.5mm audio output with two devices or can go the other way and interface your Bluetooth to a speaker. Pretty slick.

I just signed a contract at $333/ sq. for Owens Corning Duration in the Chicago area.

2% Lanthanated works well on both for me.

In my area there's no free way to recycle florescent tubes and it's illegal to put them in the trash. Add to that the florescents don't seem to last as long as I think they should. It makes the LED option look better if you want to avoid the disposal hassle.

The white is a neutral lead which only would be used if you decided you wanted to turn the 220V drop into one or two 110V circuits. In your application you don't need it and it should be capped. -- Paul S