Installed a water heater today, 50 gal electric. Chose the type with a clean out door since the house is on well water and sediment is an issue. No problem with the installation but a curious thing happened and made me question what could be the cause of it. The house is plumbed with a clear tubing, pex like so you can actually see the water flow in some areas, such as the inlet and outlet lines to the water heater. Anyway, connected the heater and began to fill as I've done many times before. As the tank reached the fill point I was at the heater and through the clear outlet (hot) side I saw this 6" black shadow pass through the pipe. About 10 seconds later the water flow stopped through every tap. It was very dense as if it was an actual plug. 30 seconds later the water began to flow again, and sputtered out dirty black water at first. Now, 6 hours later every thing is fine and no pressure loss. So my question is...was this some type of grease or oil in the tank from the factory? It wasn't in my water line and the tank was new in the box. This is the first water heater I have installed with clear tubing, so I have not seen this before. Anyone have similar experiences?
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