I am finally putting heat in the new woodshop, I got a reznor 75k propane heater that mounts on the ceiling. I need to run 50' of 3/4 black iron pipe and a regulator, 2 shut off valves I own 2-100lb tanks already and a bunch of fittings. I want to hard pipe right to the heater no copper or stainless tracpipe.A neighbor is a HVAC guy and he has layed a plan for me to follow to do all the work. Funny thing is that he says after it is all together and pressure test is applied the pipe only has to hold 15lbs pressure for 10 mins. **** I think it should hold pressure for at least 24 hours or more! Anyone have experiance with this type of propane heater?