In comment 13525958
| I was thinking of a tankless water heater. I read that if you run the dishwasher and take a shower at the same time it will affect the hot water flow. Ant truth to this? Anyone have a tankless system? If so, what do you suggest.
It all depends on the sizing. Get one that is too small and yes that could happen.
Tank based water heaters were restricted by the size of the tank. That is you could use X Gallons of water until you ran out of hot water. But you could use that all in 1 minute if you wanted.
Tank-less waters heaters are restricted by the flow. That is how much hot water could be output at once. Depending on the sizing you can run X showers/dishwashers/etc all at once. And you can run those for as long as you want. But once you turn on something else, the flow will be impacted.
The tip I have always heard about tank-less is that you should go one size up from what is recommended. Smaller sizes seem like a better deal, but you wind up regretting it if it was not sized correctly.