We recently brought a house that was built in 1927, and much of it has been updated. The previous owners put in a tankless water heater two years ago. Our hot water is very inconsistent.
When someone is in the shower for instance, its a big no-no to flush the toilet or turn on the sink. We can live with that. The problem is that even without someone using water elsewhere, the shower temperature is likely to change any moment.
I have an even bigger problem in the kitchen, which was updated eight years ago. The water temperature used to change constantly when I was washing dishes; however in the last few weeks, I just never seem to get hot water to my kitchen sink. Previously, when hot water was coming to the kitchen, I'd have to let the water run for a good minute before I got hot water. Now, even if I pretty much let it run indefinitely, it stays cold.
Does anyone have any suggestions of what this might be, and how I could fix it?