OK you were using someone else's system. So you're basing you opinion on tankless based on a system that you don't know if it's working properly. Did you raise your concerns with the owners of the house? If you did what did they say
It is what it is. Nothing wrong with the system. Takes a while to get hot water, can't try to run too much hot water at once on different sources, doesn't sustain itself as well. Apparently a common trade-off of tankless. A cousin of mine also switched to a tankless the last couple years (family of 4) and they are not that impressed either. This was just my first time using one. Wouldn't switch to one at this point either. I'm all for efficient equipment too as I have one of the most efficient residential HVAC systems you can buy on the market.
