best tankless water heater - 2017

Looking for the best Tankless Water Heater on the market right now that suits your specific requirements? There are an abundance of models to choose from and many different factors to consider before purchasing, for instance do you require an Electric Tankless Water Heater or a Tankless Gas Water Heater? What kind of climate do you live in? Approximately how much hot water do you think you use on a daily basis, also known as your hot water demand? How much money are you willing to spend, not only on the Tankless Water Heater itself but also on installation? These are all questions that as a consumer you must ask and seek answers to, by doing so you will arm yourself with the necessary information to make the right buying decision for you.

Our aim here at Tankless Heater Guide is to be the ultimate buying guide for anyone looking to purchase a new unit, we have done the research so you don't have to, compiling comprehensive product reviews and comparisons, various informative articles and our recommendations of the best tankless hot water heater on the market right now for you, as well as more tailored recommendations for those who may have specific requirements, such as the need for a high demand water heater or if you are operating within a tight budget and therefore are in search of cheap water heaters.

Tankless Water Heaters have increased in popularity immensely in recent years due to the fact they drastically reduce the cost of your utility bills, can be installed almost anywhere in the home and provide a continual, on-demand source of hot water. The initial cost can be off-putting for some, however with Tankless Water Heaters saving users an average of 1/3rd off of their energy bills each month they are undeniably an excellent investment.

Top Tankless Water Heaters


















The Tempra 24 is the best hot water heater and most technologically advanced on the market right now. It is an electrically operated unit with an incredibly sleek and compact design and cutting edge digital temperature controls, though what really sets this product apart from others is the Steibel Eltron Advanced Flow Control System. During periods of low and medium hot water demand most models will cope given that they are of a high enough capacity, however the same cannot be said during high demand periods with the majority of the top tankless water heaters not being able to deliver a continuous flow of hot water when you require it from multiple sources. The Advanced Flow Control System identifies periods of high demand and automatically adjusts the flow rate to ensure you can have continuous hot water from every outlet in your home simultaneously.

The Tempra 24 can operate on a 208 or 240 volt input and requires 2x 60 amp breakers on 6/3 and 6/2 gauge cables as it can at times pull as much as 115amps. Flow rates are excellent - 3GPM (Gallons Per Minute) at 55 degrees F, 5GPM at 33 degrees F and 8GPM at 20 degrees F, also the plumbing fitting sizes are 3/4" which accommodate for a much faster flow rate than that of 1/2" fittings.

The best feature of this water heater however is the money it will save you, many buyers claim to have slashed as much as 20-30% a month off of their utility bills. It is priced at $698.00 which we think is very reasonable and in line with competitors, especially when you take into account that this is a superior product, depending on how much you save you could even recoup your investment on the Tempra 24 within 12 months. It comes with a 3 year warranty, which while still respectable is not as long as other brands offer so this is something to consider, also the warranty is only valid if you have your unit installed by licensed personnel which is typical of most manufacturers.

Best Tankless Water Heater

Overall this is the best unit that money can buy right now, the Tempra 24 is extremely reliable and proven, as are all of Stiebel Eltron's products and this is what makes them the best Tankless Water Heater brand. They are a very well respected company with countless positive reviews of their products, in fact there are few companies that can boast the excellent consumer ratings they do, which really is a testament to their transparency with customers and the fact that they are synonymous with producing first class products. The Tempra 24 Plus is Tankless Heater Guide's highest recommendation.


Japanese manufacturer Takagi are a leading Tankless Water Heater brand and are well known for producing highly reliable and long lasting units with a number of consumers citing them as "rock-solid" and working faultlessly for families of even 5 or 6 people, in fact this combined with the price of around just $560 makes the Takagi T-KJR2 our best value for money recommendation.

The unit is gas fired with inputs of 140,000 BTU and boasts a flow rate of 6.6PM at 35 degrees F and 3.3GPM at 70 degrees F, these are very respectable output capacities with Takagi themselves claiming it can support up to 2 bathrooms in warmer climates and even underfloor heating systems. Required fittings are 3/4", although 1/2" are available for similar models in the range which you may want to look into should these be necessary for you in particular.

The T-KJR2 also sports some very impressive safety features such as automatically shutting off in to a safe mode should temperatures rise to potentially dangerous levels and also has preventative measures to protect against frost and water surges. One thing we must note with this unit though is the fact that it is an indoor, natural gas fired unit, meaning it requires ventilation to the exterior of your home. This can be a concern for some potential buyers who may think this sounds costly and/or complicated however in reality it actually is not, the T-KJR2 can support both horizontal or vertical ventilation and Takagi carry an abundance of parts to ensure customers can configure their ventilation system to the requirements of their particular home.

The only real downside with this product we can see is that consumer reports on the difficulty of installation vary considerably with some claiming it was a simple process to others who were completely unable to install it themselves and everything in between. In the interest of safety and also as is the case with other water heaters, the warranty on the T-KJR2 is only valid should you have this installed by a professional so we do recommend this as the best course of action.

Best Tankless Water Heater

Overall this may be the best Tankless Gas Water Heater on the market right now. Takagi's reputation for manufacturing extremely reliable long-life units combined with the excellent price of around just $560 makes the T-KJR2 Tanklesss Heater Guide's best value for money recommendation.


The unti is wall mounted and is a very good choice for those of you who have larger families as it boasts a maximum flow rate of 6GPM, meaning it can support 4 showers simultaneously with no detrimental effect to hot water output whatsoever. One of the most impressive features we found with this unit is it's digital temperature control, it is so powerful that it allows you to set water temperature by as small as 1 degree between 80 to 140 degrees F, this means you can be ultra vigilant with hot water and energy output to ensure a maximum saving on your monthly bills, EcoSmart claim the unit can save you as much as 50% per month, we did not independently verify this ourselves how considering the accuracy of the digital controls it is certainly very possible.

The unit has an output of 27kw at 240 volts and fittings are 34" to support the large flow rates yet has a very sleek and compact, space-saving design. It is electrically operated which means it is typically much easier to install than a traditional gas unit, many consumers we spoke to were able to install it themselves although we do recommend having a licensed professional do this for you, especially as the Eco 27 comes with an excellent life-time warranty so you want to ensure you qualify for this.

All in all the Eco 27 is an excellent unit and is our best energy saving recommendation, in fact if you are in search of the best electric tankless water heater then this is a strong contender. It's digital temperature control accuracy, money saving potential, life-time warranty and low price make it a consumer favourite.


Rinnai are the largest gas product manufacturer in the world and are well known for their high engineering standards. Rinnai Tankless Water Heaters are among the few who are certified Energy Star holders, meaning they are recognised by government backed organisations for excellence in energy efficiency and safety. If you require an ultra high demand unit then you should definitely consider the RUC98IN, in terms of flow rate it is by a considerable margin the most powerful product on our list. It is a gas operated water heater and carries 3/4" fittings which is no surprise considering the sizeable flow rate.

Prior to our research and review of the RUC98IN we were quite concerned that it would be extremely noisy due to how powerful it is, however as it turns out it is almost completely silent, even quieter than other smaller units with lower outputs, there are also countless consumer reports and reviews citing the same pleasantly surprising finding.

BTU output maxes out at 199,000 and temperature ranges can reach as high as 140 degrees F and 160 degrees F for household and commercial installations respectively. Due to the power of the unit it can support countless showers and sinks making it ideal for ultra high dempand properties, due to being gas though it does require ventilation which can be either horizontal or vertical. Warranty periods are very repectable, for residential installs there is a 12 year warranty on the heat exchanger, 5 years on parts and 1 year for labour while for commercial installations the heat exchanger carries a 5 year warranty, 5 years for parts and 1 year for labour. Like other products on the list you must have your unit installed by a professional to qualify for warranty.

One thing that must be noted regarding the RUC98IN is that some consumers have reported it sometimes does not fire unless there is high demand, however it seems that this is only when the temperature control is set to higher ranges (140 degrees F) and the problem can be solved easily by dropping the temperature to around the 125 degrees F region.

Overall if you require an ultra high demand tankless water heater capable of supporting a number of bathrooms simultaneously then you should seriously consider the RUC98IN.


The last unit on our list is one that is quite unique and has turned out to be a massive best seller at many outlets including Amazon. The Ecotemp L5 is a compact, portable Tankless Water Heater that can be used in your home but with it weighing only 13 pounds it is ideal for camping, trailers and any situation where "off-the-grid" hot water is a requirement. It is the number 1 best selling portable water heater available right now and even comes with a shower attachment. It is powered by 2x D Cell batteries with an optimum operational pressure range of around 20-80 psi, it is also worth noting that many consumers used the unit in conjunction with a 12 volt pump.

All attachments and parts are included with the Ecotemp L5 so set up is very straightforward and many consumers confirm this. The units automatic ignition means burners should activate immediately upon water flow and all that is required for operation is to connect the unit to a standard garden hose nozzle and to hook it up to a propane tank. Flow rate rangers from 0.5 to 1.4GPM, while this is obviously low in comparison to the other water heaters on this list one has to bare in mind that this is a small, lightweight portable unit so with all things considered this is actually quite a respectable flow rate. As previously mentioned the Ecotemp L5 is battery operated so can be used anywhere regardless of whether you have access to electricity or not.

Temperate ranges from 80-150 degrees F and has a minimum operational pressure of 20psi and a maximum of 100psi. One of things we liked most about this unit is that after 20 minutes it automatically shuts off, a great reassurance for safety and solely water saving reasons. The Ecotemp L5 is supported by a 1 year warranty costs only $119.

Overall this is a very impressive little portable unit, the reviews of this product speak for themselves with some consumers having purchased more than one of these. The multi-functioning nature of this unit combined with it's very reasonable price make this Tankless Heater Guide's best portable Tankless Water Heater recommendation and also our best budget Tankless Water Heater.


Tankless Water Heaters have revolutionised the way people heat the water in their homes and are only growing more and more popular year on year, the relatively small initial investment means almost anyone really can save thousands of dollars per year on their utility bills upon Tankless Water Heater Installation, also these units a big step in the right direction towards ultimate energy efficiency in every home. We hope this guide of top rated Water Heaters will help you choose the best Tankless Water Heater for you and your specific requirements.