Tankless Hot Water Heater also known as On Demand water heater are a type of water heaters that provide you hot water instantaneously when you require. They don’t require you store the water in a tank, and thus they don’t consume the extra energy needed to heat up the stored water. In this post, we’re going to list out top 10 best tankless water heater in 2018. We have included both electric tankless water heaters and gas tankless water heaters in our list.
Here’s a quick comparison between both:
Electric Tankless Water Heaters vs. Gas Tankless Water Heaters
The electric on-demand water heater uses electricity as the source of its energy as you would’ve already guessed from the name and the other one uses gas as its primary source. An average tankless water heater generates hot water at the rate of 2 to 5 gallons per minute (7.6 to 15.2 liters).
Initial Investment Factor
The first and foremost difference between both is the cost factor. Electric on-demand water heaters cost significantly less than gas tankless water heaters. So, your initial investment into the product will be quite less comparatively if you decide to go for the electric one. A tankless gas water heater costs somewhere around $700 to anywhere above $1000 while the average cost of tankless electric water heater is somewhere around $300 to $800.
TL;DR – If you don’t wish to invest much right now then go for an electric tankless water heater. But, expect some efficiency issues compared to the gas counterpart.
That brings us to our next factor of comparison – efficiency. Which was is better and more efficient? Tankless gas water heaters outweigh the electric ones in efficiency. But if you look at the overall effectiveness of a unit where we include costs and output as well then electric on demand water heaters come on top.
The reason is simple, even though gas is cheaper than electricity per BTU, it is still a fluctuating unit compared to electricity. It may not provide high efficiency all the time. And also if we consider the future maintenance aspect, gas water heaters require more maintenance like up to 15 to 20%.
TL;DR – Electric tankless hot water heater is your way to go if you don’t need multiple usages at the same time and don’t wish to spend more in the future as well.
Now, let’s take a look at the best instant hot water heater available in the market currently.
Top 10 Best Tankless Water Heaters
We’ve compiled the best products and provided a brief review based on all the customer reviews and ratings. We’ve done our best to help you pick out the best tankless water heater for your needs.
10. Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower
One of the best selling products out there in the market currently. Eccotemp L5 Portable is an excellent and budget solution for small needs. It generates around 1.4 Gallons per minute, and it runs on Liquid Propane fuel. It also uses a 2D battery cell for ignition. It requires 20-80 PSI of water pressure to work efficiently. The weight of the whole unit is just around 13 pound, so it’s easy to install and doesn’t take up much space.
If you’re looking to use it in your house or some enclosed place, then please avoid it. Since it doesn’t have proper venting facilities which is desperately required if you use it in small surroundings, it is not advisable to use it in enclosed space.
Overall its been rated 4.5 out of 5 by all the customers who’ve bought it, so it’s a good product to take into your consideration.
9. Ecosmart ECO 18 Electric Tankless Water Heater
Ecosmart ECO 18 is an electric tankless hot water heater which consumes 18 kilowatts at 240V. It comes with a secure digital temperature controller which allows you to set your temperature in increments of 1. It provides better efficiency then Eccotemp since this one can heat over 2.5 gallons per minute.
You can easily run two showers on this one if you want. Ecosmart also provides a lifetime warranty for residential users which is great. It claims to save up to 60% of your costs on water heating due to its advanced technology.
It has an overall rating of 4.4 out of 5 and the energy saving that the company claims seems entirely valid. The installation process is smooth and straightforward, and the company support staff is exceptional. Overall a great product for the price it comes at and the value it offers.
8. Takagi T-KJr2-IN-NG Indoor Tankless Natural Gas Water Heater
Takagi T-KJr2-IN-NG is another great tankless water heater which is perfect for your indoor needs. It uses natural gas as its energy source. And it can generate up to 6.6 gallons per minute which are great compared to both the products above. It falls in the same price range as the Ecosmart ECO 18 model. However, it does require 4-inch category III stainless steel for venting.
It has overall 4.7 rating out of 5 which is outstanding and shows you how great the product is. This is the smallest model Takagi makes and still it is perfect for a family of 4 adults. The installation part is smooth, and it does require that you get your basic instructions, but the rest of the stuff is pretty straightforward.
7. Ecosmart ECO 27 Electric Tankless Hot Water Heater
Ecosmart ECO 27 is an upgraded model of Ecosmart ECO 18. Eco-smart is a great company when it comes to eco-friendly products, and that is the reason why thousands of people trust them and love them. ECO 27 is just a little costlier than ECO 18, but it’s much better efficiency wise. It requires three 40 amp double pole breakers for this to function properly.
It has overall 4.3 rating out of 5 and depending upon your inlet temperature this could be the best product for your needs. It takes about 20 seconds to get the water hot initially but once ready it gives the best efficiency you can ask for in a product. We recommend you to check this one out.
6. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
Rinnai RUC98iN is a gas tankless water heater which can generate up to 9.8 gallons per minute. Not only does it have an impressive GPM it also has an easy installation process. The space saving design allows you to install it easily anywhere you like. It also has a flexible option for venting which allows you to use Concentric or PVC whichever easier for you. With Ultra low NOx emissions it is a good eco-friendly tankless water heater that you should have.
It has got an overall rating of 4.6 out of 5, and customer reviews are highly positive. Some customers have reported that installation part can get a bit tricky so you should do a little bit of research before hand. Overall working of the heater is great, and it works quietly without making any noticeable noises. The machine also works smoothly when using two showers at a time. It’s another fantastic product that you should check out.
5. Rheem RTG-64XLN 6.4 GPM Tankless Gas Water Heater
Rheem RTG-64XLN is a gas water heater which can generate up to 6.4 gallons per minute depending on your region. It is an outdoor heater unit and fitting is quite simple. If you have a little know-how of wiring and handy work, then you should be able to mount it and install it yourself. One of the advantages of the outdoor unit is you can avoid the extra expenses of vent pipes and fittings.
This one has an overall rating of 4.6 out of 5. The product is currently in high demand and rightly so considering its price and quality it offers. You should consider this one if you’re going for outdoor units mainly.
4. Rinnai RL75iN Natural Gas Tankless Hot Water Heater
Rinnai RL75iN is another good Rinnai model on our list. It is capable of generating up to 7.5 gallons per minute. You can use it for both residential as well as commercial purpose. It provides Temperature range of 98°F to 140°F on residential settings, and you can increase it up to 160°F for your commercial needs using an additional controller. You need to purchase the controller additionally if you require that. It comes with a standard digital controller and it provides up to 82% thermal efficiency.
The overall rating for this one is 4.2 out of 5 given by all the customers who has purchased this product. This is the only tankless water heater on our list that you can convert to propane from natural gas if you want to. You need a certified plumber, though, don’t try to make changes on your own when it comes to anything relating to gas/fuel.
This one is capable of handling multiple appliance usages at a time, and our recommendation is you check this one out if you’re looking for a machine that can handle heavy usage.
3. Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater
Eccotemp FVI-12-LP is another Eccotemp product on our list. This one also uses propane as its primary source. This is primarily recommended for people with a smaller budget as well as needs. It costs way less than the other products on our list and still can provide matching results. It works perfect for smaller houses, so this is recommended mainly for those.
It requires an average of 30 to 50 PSI, and it cannot function properly on lower PSIs, so you need to make sure you have got enough pressure before deciding for this one. The design is also quite good it doesn’t occupy much space as well. It gives you hot water within a couple of seconds, so performance wise it is great. Installation part can get a bit tricky since this one requires 2-1/4″ Stainless vent pipe. You might need to spend around $50 for the installation parts which is pretty good comparatively.
It has an overall rating of 4 out of 5 stars, and it is worth checking out if you don’t wish to spend much right now. This is an excellent product considering the low price.
2. Rheem RTE 13 Electric Tankless Water Heater
Rheem RTE 13 is another Rheem product on our list. This one is electric compared to Rheem RTG-64XLN, which was a gas tankless water heater. This one also costs much less than the gas counterpart. On the other hand, it also provides fewer Gallons per minute in comparison. The Rheem RTG-64XLN can provide up to 6.4 GPM while this one can provide up to 4GPM only. But, the major difference here is the price and power source.
If your requirements are not huge, then this is one of the best machines out there. It costs way less than others, and the performance is not bad at all. It comes with on-unit temperature control and LED indicator on it. It is the best for single shower usages, and it doesn’t do so well with multiple concurrent usages.
Overall it has an average rating of 4 out of 5 and high amount of satisfied customers with the product. It is truly eco-friendly, and the results will be directly visible on your bills. It is so compact in the size that you’d be able to fit it almost anywhere. This is the best product out there for single users who don’t require multiple usages.
1. Stiebel Eltron Tempra 24 Plus Electric Tankless Whole House Water Heater, 240 V, 24 kW
Stiebel Eltron Tempra 24 Plus is the best electric tankless water heater out there which generates enough hot water that it’s sufficient for your whole house. It has a sleek design which allows you the freedom to fit it anywhere convenient for you. The major plus point is it does not require any venting. It also comes with a digital temperature control which allows you to control easily and change the temperature whenever you like.
It has an overall rating of 4.8 out of 5 which is exceptional. The quality of the product is excellent, and almost everyone who uses this is highly satisfied with its functioning. The product efficiently maintains the hot temperature no matter the consumption. The pressure may slightly reduce if you’re filling your bath tub and washing the dishes at the same time but it is nothing major. A great product with exceptional customer reviews and ratings!
- Top 10 Best Tankless Water Heaters
- 10. Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower
- 9. Ecosmart ECO 18 Electric Tankless Water Heater
- 8. Takagi T-KJr2-IN-NG Indoor Tankless Natural Gas Water Heater
- 7. Ecosmart ECO 27 Electric Tankless Hot Water Heater
- 6. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
- 5. Rheem RTG-64XLN 6.4 GPM Tankless Gas Water Heater
- 4. Rinnai RL75iN Natural Gas Tankless Hot Water Heater
- 3. Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater
- 2. Rheem RTE 13 Electric Tankless Water Heater
- 1. Stiebel Eltron Tempra 24 Plus Electric Tankless Whole House Water Heater, 240 V, 24 kW