Best Tankless Water Heaters

Home & Kitchen

Rain or shine, snow or drought, you gotta love a warm shower anytime. While cold showers have some unique benefits, warm showers have some too. So having a good water heater can guarantee you the pleasure of a warm shower any time. Actually, you can do better… by going for a tankless water heater.

Why a tankless water heater? Well, size matters here. The idea is not to be bigger, but smaller. And tankless water heaters manage this a whole lot better than others. There is no big tank taking up extra space and the water is heated as it runs through the heater. So you can enjoy a hot shower and save up on space, money, and energy consumption.

And so we have compiled a list of some of the top models currently available on the market. They have been selected based on essential factors like durability, performance, and efficiency. So let’s get right into these incredible devices.

Ecosmart Electric Tankless Water Heater


Product Info
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
Why we like it: Fantastically economical in that all important triangle of cost, energy, and space. Features a patented system of self-modulation.

Editor’s rating:

When it comes to saving money, energy, and space, this water heater is for the win! It has the self-modulating technology that is unique and patented by Ecosmart. It is so effective, in fact, that it is capable of heating up two showers and sinks at the same time in relatively warm areas. In cold climates, its abilities are limited to a single shower and sink. If you can get the sizing right, you can enjoy an unlimited supply of hot H2O.

The water is heated as it flows in through the heater, unlike a tank water heater where it is heated and stored. In the interest of being cost efficient as well as energy efficient, this water heater only heats up water when you want it to. As a result, the cost of water heating with this heater is cut in half! Also at your disposal is some of the most advanced self-modulating technology out there. And of course, since it is tankless, you get the obvious benefits of less space being used up.


Stiebel Eltron Tempra Tankless Electric Water Heater


Product Info
  • Digital temperature control. Voltage : 240 Volt or 208 Volt
  • Proven reliability
  • No venting required
Why we like it: Leaps and bounds ahead of the competition, this water heater is a prime candidate for being the best commercially available product in its class.

Editor’s rating:

The designers and engineers working for Stiebel did a lot of thinking about how water heaters are produced before they came up with the Eltron Tempra. As you can see, it does not look very much like any other water heater out on the market. And that is because it is not just any water heater. It has been thoroughly redesigned and re-engineered from the drawing board. The idea behind it all is to make it the most technologically advanced water heater you can buy. Have they pulled it off? We have a sneaking suspicion that they just might have.

Some of the upgrades worth mentioning are some super tough electronic appliances, and a design simplified to a singular flow sensor with an advanced flow control for this, the Plus model. Some big leaps have been made with energy consumption as well. This water heater now uses around 15 to 20% less kWH than a conventional water heater. It is cheaper than a gas powered water heater and the same goes for the installation. Is it the best one you can buy? Well, we have that kind of feeling.

Eccotemp Tankless Water Heater


Product Info
  • Includes 9' CSA approved gas regulator and hose for use on a standard 20 lb grill style tank
  • Includes stainless steel rain cap; 74,500 BTU's
  • Includes 1/2" NPT to garden hose adapter
Why we like it: Consistently delivers in a variety of different conditions and comes with the added assurance of a one-year warranty.

Editor’s rating:

The eccotemp is one super-hot device that is as suited to moving about as it is to staying still. Its water heating properties are super-efficient and can maintain temperatures between 80 and 145 degrees in tandem, with a flow rate of up to two and a half gallons a minute. It is also capable of equal distribution to one or two warm water accessories if necessary. However, it does not get overzealous. The 2 D cell battery operated ignition only fires it up when water is flowing so that any risk of overheating is eliminated.

The ignition makes this water heater ideal for use even in remote areas where the power supply is limited. Anywhere between 20-80 PSI is considered an optimum operating range. Also, installing it is a simple matter in many kinds of bathrooms. It could be a proper house, a little cabin, a shed, or even an RV, just about anywhere that a bathroom can be set up. You also get one year of warranty which is suggestive of high build quality.

Titan Electric Tankless Water Heater


Product Info
  • Tankless Water Heater
Why we like it: A highly usable and frequent buy on the market, and warms up the water immediately so that is all you feel when you hit the shower.

Editor’s rating:

This water heater is intended primarily for use in areas where the climate is generally warm. That is to suggest an area where the unaltered temperature of the water coming in is regularly above 65 degrees Fahrenheit. It is a completely trouble-free replacement for any tank unit you might have installed earlier. It heats up the water almost instantaneously, so there is no need to bear the discomfort of a colder shower before it eventually warms up. This is a very popular model.

Being tankless, it does not occupy a lot of space in your bathroom, and it is a lot more efficient with its energy consumption. But why would you need such a device in a warm climate? Would that not be antithetical to a refreshing shower? As it turns out, a cold shower can be revitalizing and refreshing but a warm shower is altogether more soothing. The sensation of warm water running down your body just cannot be beaten in any weather conditions. So yes, Titan has done right to configure this for a warm climate. And the sales confirm it.

Camplux Portable Propane Tankless Water Heater


Product Info
  • CSA approved portable tankless water heater for US &Canada markets. Lowest water pressure start up just need 3.0 PSI!...
  • The maximum temperature raise is 114.8℉(46℃) and the minimum temperature raise is 46.4℉(8℃)for 1.32GPM.
  • Its compact size with folding handle keeps it out of the way, allowing for a convenient set-up outdoors.
Why we like it: Who says warm water privileges only exist at home? You can take this one along with you anywhere and still enjoy the benefits of a warm shower.

Editor’s rating:

This water heater is just as suitable to use indoors as it is outside. A water heater that can be used outside? Now you really know that you live in an advanced age. So now you do not necessarily have to be in the bathroom to enjoy a hot shower, heck yeah! And since it can be used outdoors, you might as well try it on your dog, car, horse, boat, swimming pool and – woah, slow down hammer, I ain’t that rich. Very well, you can still acquire this thing for a very budget-friendly price tag.

Being portable water heater, the ignition is a 2 D cell battery powered system. So no electricity to limit where you can take it. The optimum gas pressure is at 0.4 PSI and the power output maxes out at 34000btu/h. Installing this water heater is a simple matter of hanging it with the handle it uses and connecting the hoses designated for gas and water. Afterwards, install the batteries and have some warm water fun wherever you are. Easy peasy.

Rinnai Natural Gas Tankless Water Heater


Product Info
  • INDOOR installation only. Fuel Type: NATURAL GAS.
  • Concentric or PVC venting option
  • Up to 0.96 Energy Factor/Up to 0.92 Uniform Energy Factor
Why we like it: A quality product from one of the best, and it continues to advance the water heater’s march in a technological rally.

Editor’s rating:

Rinnai is one of those manufacturers that are at the forefront of the industry. And true to form, they have shown a good hand again with their Ultra series natural gas tankless water heater. It advances the technological standards of water heating by employing a condensing function to amplify efficiency. In addition to all of the usual advantages you get from using Rinnai, you can now add better energy consumption to that ever-expanding list. This water heater is more efficient than ever.

Thermal efficiency has gone way up to 95%. The heater uses natural gas or propane as fuel. The temperature for residencies can be adjusted between 98 degrees and 140 degrees Fahrenheit. Meanwhile, the commercial temperature range is between 98 degrees and 185 degrees Fahrenheit. It may be a superb product, but that does not mean Rinnai has gone all out cheap on its warranty. There is a 12-year warranty in place for the actual heat exchanger and 5 years for the various parts.

Rheem Tankless Propane Water Heater


Product Info
  • 94-Percent Energy efficient with stainless-steel condensing heat exchanger
  • Intelligent electronic controls designed to increase energy efficiency and safety
  • Third party efficiency listed by AHRI
Why we like it: Exceptional build quality and durability with this water heater, thanks to some very high standards being maintained right through the production.

Editor’s rating:

Most of us who have bought a product from Rheem will have, at some point, become aware of its notoriety for exacting rigorous standards on the manufacturing process. Nothing is considered a fair trade in lieu of durability and build quality. Everything from raw materials to final inspections are carefully examined and scrutinized. The result is a water heater that performs rock solidly and keeps at it for a very long time. With such demanding requirements to be met, few other manufacturers can rival it.

Proof of this exhaustive attention to detail can be found within numerous certificates from many government tests and private laboratories owned by a third party. One of the notable third parties that have listed the efficiency of this water heater is the AHRI. You can also take a look at the performance. 94% energy efficiency, courtesy of a condensing heat exchanger made from stainless steel. The electronic controls are intelligently configured to maximize safety as well as management of energy.


Ecosmart ECO MINI Electric Mini Tank Water Heater

Product Info
  • Sleek and compact design with digital output temperature display
  • ECOSMART tankless water heaters are 99.8-percent energy efficient
  • Manufactured in United States
Why we like it: Perfect for a small family, economical to use, and contains a special valve that lets you enjoy the same temperature at variable flow rates.

Editor’s rating:

If you are part of a small household that does not use a huge amount of warm water regularly, we reckon this is the tankless heater worth going for. The warm water supply is unlimited, but it does not bother heating up whenever it is not in use. So that is a big plus with saving energy and money.

The ignition system on this heater has no electrical connectivity, so no energy waste there. Often times with traditional heaters, increasing the flow of water means that it will get colder and colder. With some heaters, increasing the flow can cause them to stall altogether and require a restart. But the gas controlling valve in this heater completely eliminates that problem and lets you enjoy the same warmth at a gentle or rapid flow.

Aquah Propane Gas Tankless Water Heater


Product Info
  • AQUAH propane gas tankless water heater, 4.23 gal (16 L)/min or 254gal/hr
  • Automatic electrical pulse ignition with no standing pilot, operated by 2 D Batteries or 120V AC
  • 85% thermal efficiency, 32,000 Watt / 109,260 Btu/h thermal input
Why we like it: Phenomenal control of its water heating faculties and equally able in different climates. And you can count on it for many years before you think about getting a new one.

Editor’s rating:

The Aquah indoor water heater has ignition system powered 2 D batteries, but it is not to avoid a dependency on electricity. Instead, it is to operate an ignition via an electrical pulse without the need for a standing pilot or electric hook up. Thermal efficiency is a decent 85%and the power output goes up to 109260 Btu/h. It has the control necessary to deal with both winter and summer. And its gas flow can be adjusted depending on the flow rate of the water.

The whole unit weighs over 30 pounds, so definitely not portable then. It temperature regulation is impressive. It can take a thermometer up to 45 degrees higher than normal with a flow rate of nearly four and a half gallons a minute. It also has durability on its side. A single unit can last for several years before needing to be replaced. And it is adept at dealing with differing weather conditions, exerting the right amount of control on temperature and flow to produce a shower that is consistently warm and soothing.


Tankless Water Heater Buyer’s Guide

Tankless water heaters are do not come cheaply. Buying and installing one in your home can sometimes be a costly venture that you will have to live with for many years. To that end, there are some important features of tankless water heaters you will want to consider before making your purchase, as well as very important features of your own home that you’ll want to investigate before making a purchase. Not every home is set up to work with any and every tankless water heater, and not every tankless water heater will work very well.

Water Temperature
While the temperature that you keep your hot water set to is an individual choice, for those seeking to maximize their power savings while still getting water that they can enjoy, keeping the water temperature lower may be a good idea. However, keeping the water temperature too low can result in the certain pathogens, such as Legionella, to survive and make it into your water. Likewise, every water heater, whether tankless or conventional, has to use energy in order to heat water from an original temperature at input. Before purchasing your system, assess what the incoming temperature of your water will be, in every season. The lower the temperature, the more energy it will take to heat the water to the degree that you want.

Gas or Electric?
More conventional water heaters operate heat water through either igniting natural gas or propane, or through using fully electric systems. If you are replacing a gas or propane system, you will likely want to replace it with a gas or propane-powered tankless water heating system as well. However, it is possible to install an electric system as a replacement. If this is the case, you will likely need to expand the electrical input for the replacement system, as electric tankless water heaters require more direct electrical current to operate. If you are replacing an electric conventional water heater with a tankless gas system, you have a much more complex operation on your hands. You will not only need to have gas lines installed, but ventilation systems for the excess heat that is produced with such systems. An expert will almost certainly be needed to help you with the installation.

Gallons Per Minute
The amount of water that you new tankless water heater can produce is determined by its gallons per minute (GPM). Cheaper systems will have much lower gpm factors, typically under 5 gallons per minute. This means that once that gpm is reached, the water pressure will drop off, and the temperature of the heated water will fall. Remember that tankless water heaters are just that: tankless. They heat the water at input through a series of copper housings. If you have a large house and a large family, it is likely you will need to purchase one of the more expensive systems that max out at 9 gallons per minute or above. Avoid the disappointment that may come with buying a cheaper tankless water heating system that fails in effectively replacing your old conventional tank heater.

Flow Activation
All tankless water heaters work by electronically measuring the flow of water, and turning on automatically based on that water flow. The higher the flow requirement, the slower you will experience the hot water that you’re looking for. Most tankless hot water heaters have an initial flow activation that is below 1 gallon per minute, with ranges between .3 and .9 gallons per minute. Understanding this number will help you understand what how quickly you can expect to experience the hot water that you want. The lower the gpm, the faster you will experience hot water. Many new tankless hot water systems have advanced microprocessors that help manage and detect the water flow.

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