4 Gallon Capacity, 120-Volt – Ariston Andris Mini Tank Electric Water Heater – Heating Solution for Under Sink, RV, and Compact Spaces, Smart Boost for Versatile Heating, Simple Installation

It's earth day and appropriately so I decided to weigh in on the reviews. I've had my Ariston 2.5 gallon water heater installed (I did this personally, big fan of DIY projects) for 4 mos. As an avid cook, I am constantly needing short bursts of hot water to rinse my hands, clean utensils, rinse wine glasses, etc. This is the solution. Never a better home improvement idea has been fulfilled that I can even compare to installing this water heater. Because this is a tank, it can provide water at a very low pressure/volume. The sort of low volume that would otherwise not trigger many tankless water heaters to start heating. More importantly, no more grief as you wait endlessly for the water to get hot. Most people aren't even aware that their dishwashers/washing machines are filling up with cold water (on the "HOT" water setting) because the water from the line is not hot yet and the machine will most likely be full by the time the water is hot. I have my tank connected to my incoming hot water line (from the tankless main unit outside my house) to my kitchen sink/dishwasher using a "T" adapter. I power both with a single outlet also with an adapter. The two can run simultaneously as I've discovered without tripping the breaker. This is truly a great product. It has performed flawlessly, it's compact and genuinely attractive. There's no noise while it's heating up the water and it maintains temperature really well. The other cool thing is that if I'm needing more than (2.5 gallons) what's in the tank, the refill water flowing into it (from my tankless main water heater) will be hot by then. Saves money and electricity, wear and tear, etc. Again, in my case, this unit serves as a flow through ('in line") source of hot water. Before purchasing this, I ran the sink until the water was adequately hot and discovered over two gallons of water went down the drain. In a kitchen, it's really common to require incremental and low volume hot water. Constantly waiting and wasting just to do a quick rinse of your hands is enough to justify adding this to your life. However, saving water and adding convenience is what sells it. Remember, this unit is not coming up to temperature gradually, it is storing water at a constant temperature. Whether you go this route or choose a mini point of use tankless unit, you get hot water instantaneously. It's a game changer. I've been so happy (and enlightened) with this that I've offered to install one for a relative who has the same water wasting set up. It's one way (as is this review to inspire people to get one of these) to pay forward wisdom that changes the planet for the better. Don't procrastinate. This will be one of the best decisions you'll make to add convenience to your otherwise crazy family life like mine. And you'll be patting yourself on the back wondering why you hadn't done this a long time ago. Best of luck!!!

This is a great little heater. My camper came with one installed when I purchased it 8 years ago. No telling when that one was bought. Mine stopped working, so I got a new one. It came with clear directions; easy to remove the old one and hook up this one to the already existing PEX piping, Watched several YouTube videos about this little heater before in stalling it myself. (female 73 yrs,) If one doesn't have the PEX piping, there are videos for that also. Mine lived a nice long productive life considering I have well water and did not know to flush it out once a year. It gives me instant hot steaming water at the sink, hot enough to make tea and instant coffee. I love it. I had the option to clean or replace the corroded heating rods, but considering the low price I simply replaced the entire heater.

Outstanding product and built with quality and performance. I was amazed how easy it was to install. Disconnect your hot water line to the sink faucet, then connect a line from the hot water line to the blue intake on the heater. Bring the faucet line over to the red output line and use teflon tape and do not over tighten using non compression lines. Put the unit on a waterproof tray and I seen many pictures of the pressure release valve and none used the existing water PVC tubing to run the pressure relief hose directly into the sink drain tubes. Easily purchased a (8” dishwasher branch baffled tailpiece) installed it directly to the sink drain with a plastic hose to the Ariston water heater pressure relief valve. Having knowledge of plumbing is very helpful in this installation. I never opened the installation manual. I did browse over the quick installation guide. If you feel this is not your forte then get someone with plumbing experience to help you. I give this a 5 star rating and the fact that when I turn on the the hot water, it is hot right away! No wasted water.

I purchased a 2.5 gallon unit in 2023 & installed it under a sink far from our water heater. The unit worked great but the rust started almost immediately. We just replaced the unit in January 2026. Maybe 2 years for this thing? The marketing indicates glass & titanium tank. Not sure how glass or titanium rusts. I poured 2 gallons of rust water out of ours. Rust leaking from the top, rust in the water, lots of rust. Super easy install & it worked fine until it started leaking.