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You turn on the kitchen faucet and select hot water.
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But instead of hot water, you get cold water.
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Then lukewarm water.
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Finally, after waiting, the water becomes hot enough to use.
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If this happens every day, you may wonder why hot water takes so long to reach your kitchen sink and whether there is a better solution than simply letting the faucet run.
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In many homes, the water heater itself isn't necessarily the problem.
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You turn on the hot water at a bathroom or kitchen sink and wait.
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Cold water runs first.
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Several seconds later, the hot water finally arrives.
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If the sink is located far from your home's primary water heater, this routine may happen every time you need hot water.
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One solution is to bring water heating closer to the fixture with an under-sink water heater.
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But that creates another question.
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Should you choose a mini tank or a tankless water heater under the sink?
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If you're shopping for an electric water heater, you may notice that some models require 120V power while others require 240V.
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At first, the difference may sound purely electrical.
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In reality, voltage can have a major impact on how a water heater is installed, how much heating power it can provide, and which applications it can handle.
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A small amount of hot water for a handwashing sink has very different requirements from supplying a shower or an entire home.
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If you are shopping for an electric tankless water heater in Florida or Texas, there is one important advantage you may have compared with homeowners in colder parts of the country.
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Your incoming water is generally warmer.
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That matters because an electric tankless water heater does not simply have to move water through the unit. It has to raise that incoming water from its starting temperature to the temperature you want at the faucet or shower.
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The smaller that temperature difference is, the less work the water heater has to do.

If you're considering replacing a traditional storage tank with an electric tankless water heater, one of the first questions you're likely to ask is simple.
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What size electric tankless water heater do I need?
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You may have a two bathroom home and wonder whether one tankless water heater can handle both showers.
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Or perhaps you have three or four bathrooms and need a whole house system capable of keeping up with a busy family.
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Bathroom count is a useful starting point, but it doesn't tell the entire story.
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Your water heater is one of the hardest-working appliances in your home, yet it's often one of the most overlooked.
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Every day, it provides hot water for showers, washing dishes, laundry, and countless other household tasks. But like any appliance, it won't last forever.
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Unfortunately, many homeowners don't think about replacing their water heater until it suddenly stops working—often at the worst possible time.
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Choosing an electric tankless water heater is one of the smartest upgrades you can make for your home. You'll enjoy endless hot water, lower energy consumption, and a compact design that frees up valuable space.
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However, one of the most common mistakes homeowners make is selecting the wrong size unit.
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A tankless water heater that is too small may struggle to keep up during busy mornings, while an oversized system can result in unnecessary installation costs.
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If you're replacing an aging water heater, one of the biggest questions you'll face is whether to choose a traditional storage tank or an electric tankless water heater.
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While both systems provide hot water for your home, they work in completely different ways—and the long-term costs can be dramatically different.
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Many homeowners initially compare only the purchase price, but the real value of a water heater comes from years of energy savings, maintenance costs, reliability, and overall performance.
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You invested in a tankless water heater because you expected endless hot water, lower energy bills, and dependable performance. So when your shower suddenly turns cold or the water temperature starts fluctuating, it can be frustrating.
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The good news is that in many cases, the problem isn't that your tankless water heater is failing. Instead, it's often a simple issue related to maintenance, installation, water flow, or system sizing.
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The Professional Choice for High-Performance Point-of-Use Heating
For high-demand point-of-use applications or whole-house heating in warm climates, the technology inside the unit determines the quality of the experience. While the competition offers a 13 kW standard retail option, the Stiebel Eltron DHX 10 Select and DHX 15 Select are precision-engineered instruments designed for consistent, high-end performance.
The "Select" Advantage: Patented Advanced Flow Control™