Best Water Heaters
Review and Buying Tips

Explore the best water heaters from gas, electric, tank-type, and tankless models for domestic hot water heating. See the features and specs that are making these top heaters the most preferable choice, providing considerable savings, reliability, and longevity. The selected models come with the highest energy factor, commercial-grade components, and the most extended warranty.

This review covers the most reputable manufacturers of water heaters such as AO Smith, Rheem, Bradford White, Rinnai, Noritz, Takagi, Bosch and other, and it is not about who makes the best water heaters or is the tankless better than the tank-type.

We have selected the best water heaters by comparing the model's features, specs, analyzing the user and expert reviews and top sellers.

Our top categories

Is tankless something you would consider?

A review of the best condensing water heaters covers models with the tankless technology only. These come with the state-of-the-art technology, recirculation, commercial-grade features and ultra-high energy efficiency, which guarantees the highest savings, enhanced comfort, and better environmental protection. 

The best tankless and condensing models come with the two heat exchangers - primary and secondary (condensing), where the condensing element is made of stainless steel, to provide better protection against corrosion.

Condensing technology is what allows them to pull much of the heat from the exhaust gases and use it to preheat the incoming water. For the faster hot water delivery, some of them can work in the recirculation mode. Due to its innovative design, they can connect to smartphones, allowing better remote monitoring and control, including the voice activation.

If condensing heaters are out of your budget, we recommend checking an article about the best tankless water heaters from the non-condensing category.

These models are also high-efficient where the energy factor is in the range from 0.8 to 0.9, have one heat exchanger made from copper, use some of the smart features, even advanced diagnostics, flexible venting system, scale protection, many safety features, extended warranty and more. They usually come with the two venting options (concentric or dual) making the installation more versatile, also utilizing natural gas or propane, again giving more options.

Thinking about the best tank-type water heaters?

The best tank-type water heaters come with the stainless steel or plastic storage tank allowing lifetime warranty and long life.

The best gas models are condensing and equipped with the helical heat exchanger submerged in water, while the best electric models has stainless steel or titanium elements, and both with one powered or two commercial grade anodes, self-cleaning system, diagnostics and other. Those models come with the high recovery rate and first-hour rating, making them ideal for high-demanding applications and large houses.

Things to consider

Energy efficiency. To see how much energy gets transferred from the heat to water, look at the Energy efficiency or Uniform Energy Factor (UEF). Gas condensing models have the efficiency of over 90% or the energy factor up to 0.98. Higher efficiency means more savings and less wasted energy.

Specs. When buying a tank-type water heater, look for the high first-hour delivery and recovery rate, or high water flow rate in tankless. Another vital factor to consider is how the gas burner is powerful (in BTU).

Features. Eco burner, brass drain valve, hot surface igniter, modulation, diagnostics, self-cleaning are some of the features to go for.

Smart technologies. Smart features allow Wi-Fi connectivity, voice activation, remote control and diagnostics, and more.

Multi-link capability. This is what allows users to connect more water heaters into one system so it can provide more power and hot water.

Venting options. Power venting is the preferable option due to its flexibility and installation options.

Quality. Look for the water heaters equipped with the durable, heat and stress resistant components. In some cases, for example, stainless steel is better than copper.

Lifespan. Tankless, for example, has over 20 years of lifespan. Stainless steel construction ensures durability.

Service. It is recommended to buy a water heater from the proven, reliable and well-established manufacturer. Such manufacturers provide excellent customer service, technical support, and quite extensive service networks and warehouses with the available parts.

Warranty. The best models have the limited lifetime warranty on conventional tank-type (most often is 12) and 15-years on tankless. Choose the heater with the long warranty.

Tank vs. tankless

To decide is it better to get a tank-type or tankless, check out the following advantages and disadvantages of both:



  • The favorite type with the well-known and proven technology
  • Excellent service network
  • Variety of models available
  • Condensing technology available
  • Affordable
  • Easy to fix
  • Reliable


  • Standby heat loss
  • Can run out of hot water when used extensively
  • Lower energy efficiency
  • Bulky
  • Shorter life expectancy
  • Corrosion



  • Small and compact
  • On-demand water heating
  • Endless and continuous supply of hot water
  • Wall mount saves space
  • Flexible installation
  • High efficiency
  • Life expectancy over 20 years
  • Long warranty
  • Savings


  • Expensive
  • Costly installation
  • Venting requirements
  • Cold water sandwich effect

One of the indicators that shows which of the gas, electric, tank and tankless water heaters is the best, is undoubtedly the price. The most expensive models come with the state-of-the-art technology, great features, long-lasting elements, modern look and have the most efficient operation. They can cost over $1500.

The fact that the domestic water heating is the second largest energy expense in a house is more than enough to consider buying the best water heater with the highest efficiency and ultra-low NOx emission. Those innovative models save water, energy, and money and due to its robust and durable construction, they guarantee lengthy and reliable operation.

(updated 2020)


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