As I’m building my setup here I got another hairbrained idea. Anybody plumb the outlet of their Shurflo pump directly to the evaporator feed, no head tank? In my case 4 - 3/16” sap lines would feed a Shurflo inlet and the outlet would pump either to a storage tank or to the heat exchanger inlet on the copper pipe around my chimney. Also a throttling valve somewhere to control the flow into my pans. This could eliminate my head tank and issues I have with that.

If I did this I would only have 1/2 gpm flow from the pump at times. Not sure if that would slow the pump down and lower vacuum in the lines? Anyone else try this? Thanks.