Tankless Water Heaters have been used for decades in Europe and Asia and are gaining popularity in the US everyday. Unlike conventional heaters tankless water heaters don't store hot water. When water is needed the flow of water through the device fires the burner for instant hot water. Tankless heaters are more expensive but the benefit of not having to worry how many people have showered already when you need to soak your sore muscles at the end of a long day is priceless!
There are many pros and cons with every appliance purchase but if you read all of the tankless water heater reviews we feature here you will be one step closer to making a well-informed decision. Most people who have installed a tankless unit in their homes love it, the heaters are safe, convenient, efficient, have a long life, take up very little room, and provide clean, piping hot water on demand.
Keep reading for real, verified customer reviews, product reviews of the top tankless water heater brands, and lots of tutorials and tips to help you become comfortable with the lingo and workings of the tankless water heater.
Rheem Customer Reviews
Works great, easy to increase temp, now that winter is here, and endless hot water. This mid size unit is perfect for our needs. I will never by another tank unit again.
I put one of these rheem tankless units in - and it WORKS! sweet! I love it! I had to turn the water temp down to about 3/4 up- it was too hot all the way up. My bills have never been this low!
Benefits of Choosing a Tankless Hot Water Heater
- Energy Efficient- 30% more efficient than a conventional tank hot water heater. If you like the idea of being environmentally friendly tankless is for you. You will reduce your carbon footprint significantly with an on-demand water heater.
- Clean Water: No storage tank that accumulates rust and scale. When a traditional water heater holds water in its tank any sediment in that tank will be flushed into your water pipes. This is especially true if you live in a hard water area.
- $$$ Savings: Monthly savings of up to 40% off your heating bills. The biggest downside to a conventional water heater is that it spends all day heating and reheating the water that's sitting in its tank. That's a huge energy waster!
- Convenient: Continuous hot water, no more scheduling of bath times! The best benefit of a tankless unit is that if three people have already showered, you still can too! Just get an instant heat unit with a high enough flow rate and if you live in a cold climate go with a gas unit and you'll be a happy camper.
- Long Lasting: Tankless heaters last twice as long as conventional water heaters. Traditional water heaters have a lifespan of 10-13 years while a demand unit will last over 20 years.
Rinnai Customer Reviews
My husband and I installed this ourselves. We went from an electric 50 gallon water heater to this. I can honestly say I love the heater. I do not have to worry about saving any hot water for my husbands shower because there is a never ending supply. I will never go back to a tank system.
Initially, I was skeptical. Now that the replacement Rinnai is installed, we have plenty of hot water. This thing will easily keep up with two sinks and a shower running simultaneously with winter supply water temperatures.
Choosing the Best Tankless Water Heater Brands
There are many top rated brands on the market today that offer propane, natural gas and electric tankless models. Luckily, there is a fairly wide range of prices available. Of course, with a cheaper price you will probably be giving up some quality or some advanced features. A good rule of thumb is when you decide to invest in a tankless unit you should look at it as an investment rather than looking for the cheapest price. However, there are always deals to be had and even a top rated, five-star reviewed tankless unit can be found at deeply discounted prices. Check out our Ultimate Guide to Tankless Water Heaters for the best price guide.
- Rinnai – These heaters get great reviews online. Their advanced technology make them sought after units. There are good customer reviews on the RL75iN, RU98IN, RL94iP, V65EP, and the V65IN. Prices are $600-$1,500
- Bosch- Offers mini-tank, whole house, and tankless units of many styles and specifications. Bosch has been around a long time and has decent reviews overall, some great, some good. Great ratings can be found for the Ariston series, the GL 2.5, GL 6, and the GL 4S. Prices run under $100 to over $1,000
- EcoSmart- This is a great lower end brand. The reviews come back really good overall with multiple four and five star products and the prices are lower. Top electric tankless models from Ecosmart are the ECO 27, ECO 11, ECO 18, ECO 24 and the ECO 8. From $100 to $600.
- Rheem – is one of the top brands and has multiple four and five star reviewed products. Its series includes propane, natural gas, and tankless electric heaters, condensing units, indoor and outdoor installs. Many of the Rheem heaters have top ratings like the RTG-84DVLN, RTE 9, and RTGH-95DVLN. The RTE 13 is the bestselling tankless on Amazon! Prices are $200-$1,300
- Takagi – Is a pioneering brand in the water heater industry. Several of Takagi's heaters are holding 5 star reviews on Amazon. The best tankless gas units are: TH3DV-NG, T-H3-DV-N, T-K4-OS-NG, T-D2-IN-NG all have awesome reviews.
- Noritz – Offers the high efficiency ecoTOUGH™ line, the durable ProTOUGH™ line and the cost effective ValueSolutions line. The best gas tankless water heaters they offer are the NR50-OD-LP, the NR71-SV-NG, and the NRC98-DV-NG.
Noritz Customer Reviews
You do get what you pay for! THIS WATER HEATER IS AMAZING!! I LOVE IT!!!
Look no further ... Costs, quality and efficiency... This is the best in this technology.
Efficiency, dependability and great warranty!
What Size Tankless Water Heater Do You Need?
To determine the size of the tankless hot water heater you need, you’ll need to calculate how much hot water you’ll need at one time, which is called the flow rate. Flow rate is measured in gallons per minute (gpm). The table below provides typical flow rates for typical household hot water applications.
Figure out what would be the maximum flow you would typically need. As an example if you would like to be able to have three showers going each morning and the kitchen faucet running for washing breakfast dishes you would need a maximum of 11 GPM. If you install low flow faucets you could get away with a much lower max GPM.
1.5 to 3.0 GPM
1.0 to 2.0 GPM
1.0 to 2.5 GPM
0.5 to 1.5 GPM
3.0 to 7.0 GPM
You will also need to consider the average temperature of the water coming into your home. Most tankless units can handle a 70 degree rise at 4 GPM gas powered and 2 GPM for electric powered. This means to get 120 degree water, which is what most people will want for things like laundry and dishwashers your incoming water needs to be 50 degrees on average.
If you live in a cold climate that won't happen so you will have to take that into consideration when choosing a water heater. This guide shows some average temps for various US cities inlet water.
Top 4 Best Reviewed Tankless Water Heaters
Check out this YouTube video on the basics of tankless units, it gives a nice overview for those folks who have not had much experience with this style of heating unit.