We have a brand new gas & electric water heater. Purchased in 2013. For some reason, when we turn on the hot water in the master shower, it only gets lukewarm unless one of the sink faucets is also turned on.
I know another person posted a similar question, however, ours is not a tankless water heater. Ours is a 70-gallon water heater.
As a note, we do have a timed circulator attached to the heater. And we have set it to run at the right times. Even still, the shower wont' get hot unless we also turn on a sink.
Another note, we've also removed the mesh inside the shower head so there is no restriction on the water pressure.
Any advice would be of great help! Thanks in advance, Lilly