Plumbing... it's all taking longer than I anticipated. I've employed the 2 steps forward, 1 step back method of black pipe fitting. It has been an education. The black pipe boiler loop and primary loop are finally plumbed and it's time to start on the 6 zones (house, storage, mushrooms-greenhouse, machine shed, sand filter). There is no great rush now that the heating season has run its course, but at the pace that I have managed so far, I'll be lucky to get it all running by the next heating season. I have Pex-AL pex tubing in good supply but I have no fittings, no crimper, no cutter. With Pex there are several connection systems and I find it a bit confusing. People talk about copper rings, stainless steel connectors (SSC), Kitec connectors (rare find here in my part of Canada), Viega, Wirsbo and more. The SSC are inexpensive online and the crimper isn't too bad either. Will this system work with Pex-AL pex or do I have to source some proprietary system.