10 bestTankless Water Heatersof April 2025
112M consumers helped this year.
29% off
1
Stiebel Eltron DCE-X Premium Compact Instant Water Heater, Suitable for Showers, Maximum Energy Efficiency, Accurate Temperature delivery, 238159, 220240 V, White, 10/12 kW
Stiebel Eltron
9.8
2
CAMPLUX AY132P43 5L Portable Gas Water Heater with 4.3L Water Pump 12V,Tankless LP Gas Boiler with Folding Handle,Use for Outdoor Camping Shower RV Trip Washing Horse
CAMPLUX
9.6
3
![CO-Z Gas Water Heater, 10L LPG Water Heater with Winter & Summer Modes, 17kW Stainless Steel Tankless Water Heater, Hot Water Heater with LED Display,Use for Outdoor Camping,Trip [Energy Class A]](https://images-proxy.bestreviews.guide/m1ijSYmO3NGXP4KTUbtm5tNRoEE=/0x150/https://m.media-amazon.com/images/I/31DuLFrEx4L._SL500_.jpg)
CO-Z Gas Water Heater, 10L LPG Water Heater with Winter & Summer Modes, 17kW Stainless Steel Tankless Water Heater, Hot Water Heater with LED Display,Use for Outdoor Camping,Trip [Energy Class A]
CO-Z
9.4
4
CO-Z Gas Water Heater, 8L LPG Water Heater with Winter & Summer Modes, 13.6kW Stainless Steel Tankless Water Heater, Instant Water Boiler Hot Water Heater with LED Display,Use for Outdoor Camping,Trip
CO-Z
9.1
5
![Thermomate AZ132 5L Portable Gas Water Heater, Tankless Water Heater with Folding Handle, Instant Gas Boiler Use for Outdoor Showers, Camping, Horses, RV Trip [Energy Class A]](https://images-proxy.bestreviews.guide/sw9G_SL8Yhf1fD9FRczqkJuG7RA=/0x150/https://m.media-amazon.com/images/I/31NkupmJx2L._SL500_.jpg)
Thermomate AZ132 5L Portable Gas Water Heater, Tankless Water Heater with Folding Handle, Instant Gas Boiler Use for Outdoor Showers, Camping, Horses, RV Trip [Energy Class A]
thermomate
8.9
Other
Ecosmart 220V 11.8 KW Electric Tankless Water Heater-11.3KW TNKLSS H20 HEATER
Electric Hot Water Faucet 3000W, Tankless Electric Heater Kitchen Sink Faucet, Instant Hot Water Tankless Electric Hot Water Faucet for Kitchen Sink/Bathroom
Stiebel Eltron 222039 Stiebel Eltron Mini 4 Electric Tankless Water Heater
Upgrade Tankless Water Heater Electric 9KW 240V, On Demand Instant Endless Hot Water Heater, Portable Smart Small High Efficient Shower Heater with Intelligent Modulates to Save Energy Use (Pink)
7% off
6
Electric Water Heater 220V 6000W,Under Sink Water Heater with 30-55℃ Adjustable,Instant Water Heater with Remote Control,Portable Tankless Water Heater with 2 Modes for Kitchen,Bathroom
Luqixcey
8.6
16% off
7
ThermoMate ELEX5.5 Instant Electric Water Heater with LED Display, 5.5kW Tankless Water Heater Hand Wash for Basins Sinks, Over/Under Sink Water Heaters, Hard Wire 220V
thermomate
8.3
8
Rheem 18kW 240V Tankless Electric Water Heater
Rheem
8.0
9
Briwellna Electric Instantaneous Tankless Water Heater 5.5kW 220V, Mini Instant Hot Water Heater with Digital Display for Kitchen Bathroom Sink Counter Under/Above Home Indoor (White)
Briwellna
7.7
10
Stiebel Eltron 234407 SHC 15 GB Small unvented Electric Water Heater includinig Safety Group, 15 litres, pressurised Appliance, undersink, Plastic, 15 liters, White
Stiebel Eltron
7.5
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A Guide to Selecting the Best Tankless Water Heaters
Choosing the right tankless water heater can significantly impact your home's energy efficiency and your comfort. Unlike traditional water heaters, tankless models heat water on demand, which means they can provide a continuous supply of hot water without the need for a storage tank. When selecting a tankless water heater, it's important to consider several key specifications to ensure it meets your household's needs. Understanding these specifications will help you make an informed decision and choose a model that provides the best performance for your situation.
Flow Rate (GPM)
Flow rate, measured in gallons per minute (GPM), indicates how much hot water the heater can produce at a time. This is crucial because it determines whether the heater can meet your household's hot water demands. For example, a shower typically requires 2-3 GPM, while a dishwasher might need 1-2 GPM. If you have a large family or multiple appliances running simultaneously, you'll need a higher flow rate. Consider your peak usage times and add up the GPM requirements to find a suitable flow rate for your needs.
Energy Efficiency
Energy efficiency in tankless water heaters is often represented by the Energy Factor (EF) or Uniform Energy Factor (UEF). This spec tells you how efficiently the heater converts energy into hot water. A higher EF or UEF means better efficiency, which can lead to lower energy bills. Look for models with high efficiency ratings if you want to save on energy costs and reduce your environmental footprint. Consider your usage patterns and how much you value energy savings when choosing the right efficiency level.
Fuel Type
Tankless water heaters can be powered by electricity, natural gas, or propane. The choice of fuel type affects installation costs, operating costs, and performance. Electric models are generally easier to install and maintain, but may have higher operating costs. Gas models often provide higher flow rates and are more efficient for larger households, but require proper venting and may have higher installation costs. Consider the availability of fuel sources in your area and your household's hot water needs when selecting the fuel type.
Size and Installation Requirements
The physical size of the tankless water heater and its installation requirements are important to consider, especially if space is limited. Tankless models are generally more compact than traditional heaters, but you still need to ensure there's enough space for installation and maintenance. Additionally, gas models require venting, which can affect where they can be installed. Evaluate the available space in your home and consult with a professional to understand the installation requirements for different models.
Temperature Rise
Temperature rise refers to the difference between the incoming water temperature and the desired output temperature. This spec is important because it affects the heater's ability to provide hot water at your preferred temperature. If you live in a colder climate, you'll need a model that can handle a higher temperature rise. Consider the coldest water temperature in your area and the temperature you want for your hot water to determine the necessary temperature rise for your heater.
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