To recapitulate: We picked up our 2021 159 HR in Missoula in June and months of forum-stalking, Youtube video watching and buying of unnecessary stuff morphed into angst and action. Polyiso, then 1/2 ply subfloor, Maxxair fan, Arctic Tern window, AMA window x 2 (broke 1), platform queen-sized bed using 2" steel angle iron, composting toilet, Truckfridge in a cabinet at the door with a drawer on top and a foldout table out the door, roughed in galley, water system, 5.3 gallon Isotherm heat exchange hot water heater, and with a shout-out to Nate Yarborough, I just finished the electrical system last Friday and nothing blew up. We took a maiden voyage with all the new stuff and there were some glitches. The Isotherm tank leaks at the metal to metal connections, not the metal to rubber connections, less after I cranked them down further with a wrench. Any other suggestions? The other problem is that the Espar controller doesn't recognize the heater. This was definitely an issue since it was 22 degrees yesterday morning. When I pressed the button, it said "no heater?" While on the Espar heater, where does the 5A fuse get attached? Any help appreciated.