Seems like a lot of work and extra money added to an already expensive piece of kit.
Harold it stinks you are having issues with your new compressor. As it’s under warranty Hatsan should make it right. Would have been better if it worked right from the beginning. Also did you check to see if your coolant actually circulating through the hoses? Good luck, please keep us posted on how Hatsan treats you on this issue.
Last night I calibrated the compressor gauge to my fill station gauge, very easy to do for this neophyte. Then filled my 45 min. SCBA from 3200 PSI to 4495 PSI in under 10 minutes. So two fills so far, I expect the compressor to continue to work flawlessly. The best part of the whole deal is that I can now shoot and experiment as much as I want and not be worried about how many fills I have left. My “true” fill cost were $11 for the fill, gas $10 (60 mile round trip, bad traffic), 2-3 hours of my time = $70 (conservative est.) So at two fills in I’m at $140. I believe the compressor will paid for itself in two years. This was the crazy math I used to pitch my compressor to the wife... it worked!