As far as hot water for the shower is great, but you have to run the shower in order to get hot water out of the sink or faucet.
Excellent tankless water heater. I’m very pleased with it and your service. Only thing preventing 5 stars is lag time after water flow begins and burner ignition starts. If you try to save water by turning off faucet to get a towel or something, you,re going to get cold water before it resumes previous heat level. Tend to make you leave water running which is wasteful.