I have a Stiebel Eltron DHC 2-10 water heater that I installed in a new house I am building. I have it installed under the kitchen sink and built a little distribution manifold out of PVC that is connected to the hot water line coming from the water heater. There are 3 lines coming off the manifold - 1 for each shower, and 1 for the kitchen sink. One of the showers is on the other side of the wall where the kitchen sink is, so the distance from the hot water heater to the shower faucet and kitchen faucet is about the same. OK, so that's the setup. My problem is that in the showers, where I have identical Moen 1 handle faucets, the water is either really hot or cold. When I feather the handle back to get the water warm instead of hot, it stays hot until I get to a certain point and then the water turns cold. The faucet in my kitchen sink is a 1 handle faucet as well and it is working perfectly - I get hot, warm, or cold water. I have taken the cartridges out of the shower faucets and took them apart to check for debris or something that would cause a problem and found nothing. I even switched the cartridges between the two shower faucets to see if that would make a difference and it didn't. I spent a couple of hours trying to adjust the flow control s***w on the water heater, as well as adjusting the control valve on the cold water line going into the hot water heater. I turned the valve to restrict water flow into the hot water heater, and adjusted the flow control s***w in the hot water heater. I did this while the water was running in the shower and I made every adjustment I thought possible to nothing works. My thought is that either my shower faucets are faulty which doesn't seem likely, or somehow the holes in the shower control valve for the hot and cold water are so small that when I turn the handle to a certain point it is almost closing off the hot water side and signals the hot water heater that the line is closed, but that's just a guess. Any ideas of what the problem could be?
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