Switching from a traditional hot water tank to a tankless water heater is one of the best ways to save money every month on your utility bill. According to Energy.gov, tankless heaters can offer up to 37% energy savings. That’s why we put together the best tankless water heater reviews to make your purchase decision easy.
Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater
The Rinnai RUC98iN Ultra Series is an indoor gas tankless water heater for residential and commercial applications. It uses propane or natural gas and has multiple venting options. The RUC98iN is 26 inches tall, 10 inches thick and weighs 61.7 pounds.
Although it is compact and has a sleek design,… it is not a lightweight water heater. It has a gunmetal gray exterior with controls located on the lower lip of the front panel. These include a power button, water temperature and gas control buttons, and a digital display.
Besides controlling the temperature of hot water coming out of the unit, you can lock the temperature button to prevent unauthorized access.
Rinnai RL94iN Natural Gas Tankless Water Heater
Rinnai has improved upon and surpassed their last offering in that they now have included a built-in Circ-Logic (TM) recirculation program that is capable of cycling an external pump (sold separately) at preset intervals and temperatures to maximize efficiency and comfort. Most homes do NOT require the recirculation of domestic hot water therefore an external pump is NOT required for a typical installation of this water heater. Another new innovation included in the RL94iN is a leak detector.
Upon determining there is a water leak,… the unit shuts off the water to limit property damage. Also new for the RL94iN is a temperature lock. This prevents accidental or unauthorized changes to the water temperature. Additionally, an enhanced scale detection feature has been incorporated to lessen the possibility of serious long term damage to the unit due to excessive scale deposits.
Just like in the previous model, the RL94iN includes a Webstone Lead-free Isolator Valve Kit (Model EXP 2). New for this version is an upgraded, door mounted controller (Model MC-91-2US). You’ll stop planning your mornings and evenings around your hot water heater and set your own schedule while enjoying hot water from up to five plumbing and appliance outlets simultaneously.
PrecisionTemp RV-550 Tankless Water Heater
For a long time I have recommended the RV-500 Tankless Hot Water Heater from Precision Temp, but recently I found myself no longer being able to recommend it. I don’t normally do product reviews, but the RV500 is one of those appliances that a lot of tiny housers use and people wanting to build are planning on installing. So I thought I’d share my experience here.
To be transparent, I owned the RV550,… which is very similar to the 500, the only difference is the 550 vents out the bottom via a pipe, where the 500 vents out a side panel. While there are technical differences, they’re almost identical, save the vent method. Most people don’t know about the 550 as its just a product variant, it’s fair to say its the same series, hence me reviewing this under the RV500 title because that’s what most people will search.
I purchased the unit in 2013 after doing a lot of research about the unit. It seemed like my options where this unit or an Atwood variant that honestly didn’t look that great as an option.
Takagi T-H3-DV-N Condensing High Efficiency
There are certain things you expect with a tankless water heater: endless hot water, compact sizing, and on-demand usage are just three popular options. How come so many models struggle to meet these basics?
The Takagi T-H3-DV-N Condensing Indoor Tankless Water… Heater doesn’t struggle at all. Not only will this appliance help you to save space and conserve energy, but it will give you all the hot water you need – even if you have a large family to support.
This high-efficiency natural gas tankless water heater meets current rules that are in place for ultra-low NOx emissions established in 2012 by SCAQMD rules. It is one of the few tankless heaters that really can provide a whole-home solution for multiple people.
Noritz EZTR40-NG Indoor Tankless Water Heater
Noritz just released this very cool new tankless unit, and I was immediately impressed when I saw what this model offered. The new EXTR40 tankless water heater is meant to easily replace an existing 40 (or even 50) gallon tank water heater. If you have an existing home, and want to go tankless it can be a rather expensive endeavor.
The Tankless units are 2-3x more expensive… than standard Tank models, plus you often have extra plumbing labor to do a changeover. The plumber often has to up-size the gas line from a 1/2″ line to a larger 3/4″ (or even 1″) line. The water connections often need re-worked, and there are often flue details to be worked out. This new model from Noritz has several things that make it an easy (thus the name EZ) replacement product.
However, I would expect to get close to double the life out of a Tankless unit compared to a tank model. Tank units have a 10-15 year life expectancy. Tankless I would expect to see a 20-25 year service life. I think this model is a no-brainer for replacing your existing tank.
Rheem RTGH-90XLN Prestige Outdoor Condensing
The Rheem RTGH-90XLN gas tankless water heater is a high efficiency, direct vent, outdoor gas tankless water heater designed for continuous hot water at 9.0 galllons per min. It’s intended for use in homes with 2-3 bathrooms and features a 35° rise max when used at 9.0 gallons per minute. The Rheem Prestige line offers an industry first 0.26 GPM minimum flow rate and 0.40 GPM minimum activation flow rate.
Constructed from a stainless steel condensing… heat exchanger, this Rheem gas tankless water Heater is 93% efficient and is also ENERGY STAR rated! This system is a high performance tankless water heater, operating at 180,000 BTUs per hour. This model is designed for use with a natural gas arrangement.
This outdoor Rheem Prestige water heater does not require venting materials. However, it does require a specific clearance that can be found in the included Use & Care Manual. This Rheem water heater can be installed in a recess box installation or wall mounted, depending on these clearances and the user’s preferences.
Noritz NR981-SV-NG Indoor-Outdoor Tankless Water Heater
Are you tired of reading about tankless water heaters that can only be installed indoors or only be installed outdoors?
Noritz has heard your plea,… and they’ve created a special hybrid unit with their NR981 series that can be installed absolutely anywhere you please.
Not only is it a highly flexible, convenient unit, but it will provide 9.8 GPM as well. You may be desensitized to that number while viewing Noritz tankless water heater reviews since so many of them offer the same amount, but rest assured, 9.8 GPM is extremely high.
AO Smith ATI-540H-N Condensing Residential/Light Commercial
The ATI-540H from A.O. Smith offers some great features but falls short when comparing other tankless water heaters we have reviewed. The unit we got to take for a test drive is rated at 199,000 Max BTU with a flow rate of 10 GPM. At 10 PGM we highly doubt you will ever run out of hot water. This is the largest residential unit that they offer.
The AT line comes in an indoor… (ATI prefix) and outdoor (ATO prefix) option, as well as a natural gas or liquid propane (LP) options. The 240 line is rated for max BTU of 160,000 and 6.6 max GPM. And the 340 line is rated for 180,000 BTU and 8.0 GPM.