The biggest problems that people have with their hot water is not having enough. You may find that hot water doesn’t last long enough for everyone in your family to get a shower, or that it runs out partway through. These are problems that only exist with a tank water heater. A tankless heater can solve them. That’s because of how the two kinds of heaters work:
Tank heaters pre-heat a limited amount of water in their tank. You can get bigger tanks, but they’re expensive and there’s still a limit. If you use up all the hot water in the tank, you run out until it refills and reheats. This is what makes taking a long shower no fun.
Tankless heaters heat up water as it’s needed—whenever you turn the faucet. They can bring water up to steaming, soothing temperatures in a matter of seconds. They can provide hot water indefinitely.