I just installed two units on my new home. Water is perfect on temperature when showing but luke wam when using the sinks. Seems to take a long time to get hot water. Units are 10' away from the bath room. I have them set at 130 temp. The flow rate in the kitchen is low and unless i tun on a tub in the bath we never get very hot water to the sink. Is there any adjustment for low volumn flow to get hotter water?