I currently have a plumbing leak which has caused me to close the gate valve above my water heater unless we need hot water. By doing this, we are still able to use the sinks, toilets, etc.
One of the showers works with the valve closed, cold only, but one does not. I find it strange that a tub/shower combo closest to the water heater only has a light trickle of cold water coming out if I turn it on. Now if I open the gate valve, it's back to normal, functioning properly.
Why would one tub/shower work (cold water) and the other not when the gate valve is closed? Shouldn't I have cold water flowing in all my tub/showers when the gate valve is closed?