No hot water at kitchen sink
We built a new house over a year ago and have never had more than lukewarm water at the kitchen sink or guest bath. Haven't been able to get the plumber that installed our in slab plumbing to come back out to look at it. I also have a veggie sink in an island in the kitchen. Today I turned the veggie sink hot water on and it finally warmed up, then I turned on the hw at the big sink and in the guest bath. The water got warmer in both sinks, but slightly cooler in the veggie sink. When I turned the vs off, the other sinks immediately began to cool. Any suggestions?