Hey guys! I had my plumber install lines from a water heater to 2 sheds. The shed on the left has a utility sink. The one on the right has a shower and sink. He put a shutoff valve on the line going to the right shed before it enters the shed so we could use the sink in the left while the shower was being finished. When I turn the valve on to the right shed, the left shed has lukewarm water at best. I turned off all cold water valves at the fixtures to make sure there wasn't an issue with the lines. Water comes out at all fixtures (temperature is dependent on the shutoff valve at the WH. Any ideas?