Best mini tank water heaters


Water heaters come in many different shapes and a large variety of sizes. Before you shop, consider the hot water needs of your household. Will you need enough hot water for multiple showers running at the same time? Do you have an older home with pipes that are less than optimal for high water pressure? Do you have people in your household who like to take long, leisurely showers? All of these things will factor into your choice.

You have to make sure that the one you pick is big enough to meet your family’s needs but is not too big to disrupt your household’s daily life. You also have to take into account where it willed in your home. If you place connected to the wrong spot, you will be burning through more energy and money than you need to be. That’s why it’s vital to buy a product that works best for your needs.

Last update on 2021-04-12 at 15:18 / Affiliate Links / Images from Amazon Product Advertising API

Our recommended mini-tank water heaters:

Bosch Electric Mini-Tank Tronic 3000 – Τ4

This mini-tank water heater from Bosch is among the most popular options on the market and thanks to its attractive price purchasing one won’t break the bank. This is a 4-gallon tank which is ideal for most scenarios, yet you can find tanks from Bosch that can hold 2.5 or 7 gallons of water. The 4-tank is ideal for anyone that plans to install it under sinks thanks to its small size, so you can easily provide hot water anywhere you need it.

It can be easily mounted on a wall, floor, or put on a shelf for easy installation and connect with cold water from your water line. It comes with a 36″ cord for connecting to a standard 120-Volt outlet in order to heat the water for later use. Its sleek design allows the mini tank to easily blend with the rest of your decoration, so you can install it at any point-of-use without worries is not the smallest under-sink water heater in the market. Still, it is very compact in size, so you wouldn’t have a problem installing it even in the smallest bathroom. Overall a great choice for a mini-tank, backed by a long-lasting warranty from Bosch, this is really a no brainer if you are looking for a 4-gallon mini-tank heater.

Thermoflow UT10 2.6-Gallons Mini-Tank

The mini tank from Thermoflow is a great choice for anyone looking for a 2.6 gallon. Its capacity is ideal for easy point-of-use installations and the stainless steel tank is essential in order the heater can withstand the test of time. The device features overheat protection and a thermostat function that allows stopping heating water for low standby power consumption.

You can select the temperature range you want the device to heat water and also features frost protection mode for use in extreme weather conditions. It is very straightforward to install and can be easily placed under the kitchen and or bathroom sinks. You need to provide electrical power and connect your water line to get heated water anywhere.

Overall this is a budget-friendly option that is quite popular thanks to its relatively low price, so I think it worths a closer look if up a 2.6-gallon tank is enough for your needs.

Bosch Tronic 3000 T – Electric Mini-Tank

The Bosch Tronic 3000 T is the larger alternative from Bosch, a 7-gallon electric mini-tank water heater that is the best choice you could find if you think that smaller tanks are not enough for your needs for hot water. It is relatively small in size, so it can still fit under sinks for point-of-use hot water. This model can also be installed horizontally for up to 5 gallons of water supply if needed, with the hot and cold water lines placed on the top of the unit.

Generally, it is pretty straightforward to install since you can use a shelf or mount it on the floor with the included bracket for vertical orientation. It needs 120V power to operate and has a heating capacity of 1440 watts. You can adjust the temperature range that the device would work on based on your preference, choosing from 65 degrees Fahrenheit up to 145 degrees.

Overall, I highly suggest the Bosch Tronic 3000 T for its durability and fast recovery rates, you can’t go wrong with any model from Bosch. I think the BoschTronic 3000 is the best electronic water heater for home or office you can get at its price range.

What to consider when purchasing a mini tank heater?

If you live in a warm climate, you may not think about your water heater very often. But even in summer, you probably make use of hot showers, warm showers, and hot water for washing dishes and clothes, plus for any other uses that require hot water. And if your local climate is cold, a heater is even more important; a cold shower doesn’t have the same appeal.

Why get a mini – tank heater?

It may seem like there’s not much to distinguish a small heater from a larger one, but they’re actually are some advantages to the smaller size. These may include easier installation, better heat exchange, compact size for ultimate space-saving. A smaller heater will be much easier to install. This is the case because it is smaller and easier to handle. Moreover, smaller heaters cost less because they are made from fewer materials.

For most people, the main advantage is how energy efficient they are. Α smaller tank requires less energy to heat water, which means lower monthly bills. But equally as important, a mini-tank can help you conserve water. When you have a smaller storage tank, you’ll only be heating the water that you need and not wasting energy and money on heating water that isn’t going to be used.

Variety of sizes

They can be placed under sinks in bathrooms and kitchens without the hassle of installing a full-size heater. Since they’re installed in the cupboard, you can easily put them in a convenient spot, and they don’t protrude into the room. Your water stays hot for up to 8 hours, which is nice if you’re not a morning shower person. If you have kids or pets who waste water, this is a great way to limit the amount of water used for showers or clean dishes.

These mini – tank heaters can heat and maintain water at a perfect temperature all day, without the cost, energy demands, and noise of a full-sized water heater. They can save in space, as well making them a great alternative for small apartments and homes. If you have a hot water tank that’s more than 10 years old, you should consider upgrading your water heater since newer models are more efficient than their predecessors. When shopping for an alternative, keep in mind that a stand-alone system will be more efficient than a tankless heater, which relies on your home’s central heating system.

It is important to pick a durable and efficient heater for your home, but before doing so, you have to consider the size of your household. There are tanks as small as 30-40 gallons, medium-sized of around 50 gallons, and larger capacity ones for over 100 gallons of water. These heaters can be used with the smaller tanks that you can find in the market. Depending on the model, each heater runs on different fuels. Ideally, you should pick a heater that runs on affordable and readily available fuel to your location.

Tankless vs. Mini – Tank Water Heater

The two main types of heaters that can be placed under the sinks are tankless water heaters and tank water heaters. Tankless water heaters are newer and a bit more efficient, but they are also more expensive and require more maintenance. Tank heaters are a lot more affordable and easier to maintain, but they are also less efficient.

The most important difference between tankless and tank models is that tankless heaters can heat the water as you need it, while tank heaters use a buffer tank to heat the water. A tankless heater is a perfect alternative to a traditional tank heater. A tankless heater is a point-of-use (POU) heater that offers many advantages over a tank water heater. But as technology advances, we got some awe-inspiring models of mini-tank water heaters that can be used at point-of-use.

In this capacity, they will get your water hot for an individual’s washing machine, dishwasher, or sink, and they sometimes offer additional space for more appliances. This means you can have a secondary water heater installed in your home that is safer and more convenient than the older models.

Hot Water Demand

The average household needs around 40 gallons of hot water supply each day. You might think that the best option for your home would be the one that can provide you with all the hot water you need. Unfortunately, that’s not necessarily true. If you have a smaller heater, you can actually save money and decrease energy consumption by only heating the amount of hot water you need. Most people think that a mini-tank heater will not work for the average household. This is not true. Most mini tanks, such as the Mr. Slim, are built for people who live in apartments or small homes. They can keep a bathroom sink hot enough to wash hands and a shower hot enough to bathe, but that is about it.

I had a space problem in my house. I didn’t have any room for a regular-sized heater. I also didn’t have any room for a tankless heater either. It was either a small tank heater or no heater at all. I was very skeptical about the whole water heater at first. I was worried it was going to be too delicate to handle. However, I was pleasantly surprised when I found out it was pretty durable and reliable. It is very compact and easy to set up, and I was really impressed with features like digital temperature control.


Some people think that frost protection mode is a thing of the past, that it is a relic of the early days when water heaters weren’t as efficient as they are now. But they couldn’t be more wrong. Indeed, many of the older models don’t have a frost protection mode, but plenty of newer ones do. If you live in an area that is particularly susceptible to freezing temperatures, installing a frost protection mode is essential to protect your plumbing and avoid serious damage from burst pipes.

During the winter months, they can freeze if the water inside the tank is below 55 degrees Fahrenheit. This can lead to a ruptured tank and overflowing water. A frost protection mode is an added feature that kicks in when the temperature goes below a certain point, and it brings the water temperature up to a set point so it doesn’t freeze.

The most common ones are electric water heaters due to their lower cost but on the other hand, you can also shop for natural gas or propane heaters if you are more convenient with them. There are also solar power heaters in the market but they are not a budget-friendly option at the moment. If you can’t decide we would advise you to go for electric water heaters but just have a look at their energy consumption before purchasing. Just pick one that is energy efficient and fits within your budget.

Pick a product from a reputable brand to be back up by a long warranty and be more likely to get replacement parts if needed. If you are going to use the water heater for long periods of time, you may need to invest a little more and get a model with the highest energy efficiency. Such mini-tank heaters can also be placed under sinks providing an adequate amount of warm water for your bathroom and kitchen, but also a great option for cottages and camps.

They are normally easy to install and they are ideal solutions for instant hot water delivery with minimum waste of water heated. You can also install them in a remote location like your garage if that’s what you prefer but you have to keep in mind you need to winterize it if you live in a cold climate according to the manufacturer’s recommendation.

Mini-tank heaters are limited to the amount of water they can heat in an hour to take the time to measure the amount o points you want hot water to like a dishwasher, a washing machine, a shower, so as to have a better estimate of the tank sizes you should be looking for. Moreover, if you live in a big house, it may be wise to have heaters in any remote location where the hot water from your central heating might take too long to reach as a cost-effective solution.


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