That's not my experience with the one I use at work. It comes out as instant lobster boil. My problem with it is there's about 1.2 degrees of handle rotation between Arctic ocean and lobster boil.

You need a mixing valve at the tank to eliminate this.

I've had a gas-fired Rheem unit outside of my home for about ten years now and it's still going strong. It does an excellent job of providing hot water. One thing to note: these units need to be serviced/cleaned annually otherwise you risk gumming them up. I only recently found this out. Cleaning them is super easy. On mine there's two service valves. Simply turn the valves on the inlet and outlet to isolate the unit, open the top service valve, pour in cleaner (I forget what it was exactly), let it sit for about an hour, open the lower service valve to drain it, open the inlet valve to flush it, and finally close the the upper and lower service valves and open the outlet. Easy peasy.

Or tell them to turn the temp down on the water e
Heater' we kp,ours at 115, so it is just right when cranked all the way open in the shower or for dishes.

Ben