Electric Mini Tank Water Heater UL Listed, ThermoMate 2.5 Gallons Small Under Sink Water Heater for Point of Use Instant Hot Water 110V 120V, Wall or Floor Mounted, ES250

So far no issues. Water heats instantly which is great. Install was not difficult.

Installed under the kitchen sink so we get hot water fast. I like the size and ease of installation, but these units usually only last a few years. Just know you'll need to replace every few years.

I am in a house I just recently bought. The gas company is super unfriendly, their "inspector," is not a nice person and after clearing the house with the gas on a few months ago now says all the gas lines must be replaced? They're not even old. So, yeah, bye bullying GAS Company! I yanked out the gas stove and put it on Craigslist the next day, lovely electric cooktop now installed. We have options, today. Anyway, I researched and researched, and found this portable electric HWH that consumes low amps and is 110v! I have to admit, the box arrived and I was intimidated. I got online and started looking for "all the stuff," I'd need to install it, lines, fittings, even tools. Imagine my delight when I discovered I needed nothing other than what was already there in the house and some teflon tape I already had. Even installing the pressure relief valve (they provided it, thanks so much) was a breeze. Start to stop, it was making water hot less than 30 minutes after I opened the box. I'm using this right now in a shower. I have to spray, suds, rinse, but it SO beats ice cold showers. My plan will be to use this unit eventually in my outdoor bathhouse, but today, it's saving my life by providing me with a hot shower. So, so happy I bought this. Update 5/12/2025 - Still working great, used it this morning!

installed this ThermoMate mini tank water heater under the sink, and it’s been really handy. Instead of waiting for hot water to travel from the main heater, it delivers warm water almost instantly, which is great for washing hands and dishes. The unit is compact, fairly quiet, and the installation was pretty straightforward with basic tools. It heats up quickly and keeps the temperature steady once it’s set. I also like that it can sit on the floor or be mounted to the wall, so there’s some flexibility depending on your space. The only downside is that the tank is small (as expected), so if you run the water continuously, it will run out after a short while and needs time to reheat. Not a big deal for point-of-use, but it’s worth knowing. The manual could also be a bit clearer. Overall, this is a solid mini water heater for sinks and small tasks. Not perfect, but it works well and makes everyday use much more convenient. I’d buy it again.

It’s working like a charm. We had a plumber install it; I’d recommend that.

I selected his heater as a trial for kitchen sink upgrade due to its smaller size and price point. So far it’s doing just what it was intended to do. Nothing like having instant hot water 👍 How well it holds up only time will tell but I would not hesitate to recommend it at this point.

Installed in Jan, noticed by end of Feb was leaking from the relief valve. Ruined my bottom cabinet shelf, now I have the expense and trouble of replacing the bottom of the sink cabinet. I will put a catch mat or pan under these if I ever risk purchasing again. Installed easily, and is a great size for under bathroom sinks. The water temp range is large, sometimes the water will be lukewarm, sometimes hot. This is at the 3/4 setting.

Easy installation and works great

I have on demand tankless water heater for whole house. It wastes a large amount of water before getting hot enough at kitchen sink. Tried the small 2 gallon electric hot water in the past but found the elements were constantly burning out. This little tank puts out ample heat for the few minutes that we require for washing dishes etc. It does struggle after a few minutes with its 120 volt heater and because our well water is very cold (8 degrees C ) but covers the time it takes the main on-demand water to reach the tap. 8 months so far and doing well.

Easy to install once power had been routed to under sink. Heater just sits on bottom of cupboard as thin backing of cupboard was not conducive to mounting. Harly takes up any space at back of cupboard. Temperature setting is at max and water is sufficiently hot (too hot at times). Power cord is just 2 feet long, so consider proximity to outlet if outlet is being installed. It needed some adapters installed on the 1/2 inch males inlet/outlet to convert to 3/8 pressure fit which matched the faucet on the sink. No other plumbing required. This unit was selected as it supports a hot water feed from the main water heater. It sits in a small tray to capture any overflow should that occur.

I purchased a 2.5 and 6 gallon for use on a boat powered by inverter and solar. The 2.5 takes about 6 minutes to heat, and so you can get hot sink water for about 120 watts, decent for this setup on a boat by turning it on only when needed. Proximity to the outlet reduces fresh water use, also important on a boat. This key flaw seems to be the heat gets diluted as the tank fills with fresh water during use, so in short order you get luke-warm water rather than hot. This is more noticeable in the 2.5 gallon than the 6, which is used for the shower. Still, the temperature does not seem constant during an average shower. Overall well designed and a fraction of the cost of a marine water heater, so overall a good rating and I would recommend these units for this purpose.

I use this to run my indoor water system in a cabin. The cabin has only above ground indoor water tanks and no gas, so electric water heater is the only option. This fits well in a cabinet and I can get about 4-5 minutes of hot water for a shower depending on the type of shower. It would be nice if the power cord was a little bit longer but I have since modified the cabinet to have a receptacle close by. This is the second winter with this unit and so far I have no major complaints.

It's so nice having hot water within a second or two of turning on the hot tap in the kitchen. There is about 32 feet of pipe from the main tank to the tap, and prior to this, I had to run the hot water for more than a minute before I got hot water. The tank was installed on the basement wall, directly below the kitchen sink and dishwasher. The tank was installed inline with the hot water line that supplies the kitchen sink and the dishwasher. That way I get hot water right away for both the sink and the dishwasher, and if I want to run it longer than the small tank capacity, the main tank will be filling this tank with hot water. The only thing I found was that the temperature of the water, after it has heated up, reached it's set temperature, and the thermostat has shut the heater off; the water temperature was inconsistent and varied by 8-10 degrees. The difference was enough to get the water to uncomfortably hot temperatures the first time you used it one day, and hot but not too hot the first time you used it the next day.