A tankless water heater heats water only when you need it. There is no storage tank holding hot water in the background. Instead, the system turns on the moment you open a hot water tap and begins heating water as it moves through the unit.
This is why many people call it an “on-demand” system. It does not wait. It reacts.
What Is a Tankless Water Heater and How Is It Different?
A traditional water heater keeps several gallons of hot water in a tank. When the tank runs out, you need to wait for it to heat up more water.
A tankless system works differently. It does not store any water. Instead, it heats the water as it moves through the unit. This provides a steady supply of hot water that won’t run out.
A tankless unit is also much more compact. Since it usually hangs right on the wall, it takes up far less room than a traditional bulky tank.
How Does a Tankless Water Heater Start Heating When You Turn On the Tap?
Turn on the hot water tap, and the unit starts heating right away. Cold water enters the system, and the heating begins as it passes through.
If you have a gas model, you might hear the gentle sound of the burner turning on. Electric models heat water just as quickly, with their elements starting right away. In both types, the water heats up as it moves through the unit.
By the time it reaches your hands, it is already at the right temperature and ready to use.
How Does a Tankless Water Heater Heat Water as It Flows Through the Unit?
When you turn on the hot water, it passes through the heat exchanger, where it is heated.
The heat exchanger warms the water as it passes through. Because the water is always moving, it heats up fast and goes straight to your faucet or shower.
There is no pause in the process. As long as water is running, the system keeps heating it.
Why Don’t Tankless Water Heaters Run Out of Hot Water?
Because there isn’t a storage tank, you aren’t stuck with a limited supply of hot water that eventually runs out. The system just keeps heating more as long as you’re using it. This works great for most daily routines, though there are still a few limits to keep in mind.
If you use several taps or appliances at the same time, the system might have trouble keeping up.
It’s not really a flaw with the system or anything; it’s just a matter of how the flow rate works. Every unit has a limit on how much hot water it can deliver at once, so that total amount has to be split up between whatever faucets or appliances you have running at the same time.
In a Nutshell
A tankless water heater heats water as it flows through the system. Since there is no tank to fill, you never have to wait for it to reheat.
If you’re curious about how a tankless setup would work in your home or you’re ready to make the switch, the team at Affinity Plumbing & Water Conditioning is here to help.
Just give us a call at (952) 913-7171 whenever you’re ready to get started!