Additional menu

Best Small Water Heaters

To find the best small water heaters, we reviewed:
  • 1. Brand
  • 2. Capacity
  • 3. Cost
  • 4. Warranty
  • 5. Customer Reviews
  • 6. Temperature Range
Boiler icons set in detailed flat style. Modern and classic, slim and designer boilers. Efficient house concept for a piece on the best hot water heaters

Disclaimer: REthority is supported by ads and participation in affiliate programs. We may earn a commission when you click our links. The information included in this post is for informational purposes only and should not be taken as legal or financial advice.

The Best Small Water Heaters

There are many reasons you’d want to buy a small water heater. Maybe you live in an apartment with limited space. Or perhaps you’re just looking to increase your hot water production. Whatever the case, there are many options available. To find the best small water heaters, we reviewed:

Capacity: Ranges from 2.5 gallons to 7 gallons
Cost: Ranges from $170 to $440 
Temperature Range: Ranges 50°F to 150°F
Warranty:  Ranges from 5-6 years

The end result? A complete list of our top picks along with a complete buying guide, all to help you pick the best model for your home.

Our Top Picks

1. Bosch Tronic Mini-Tank Water Heater
2. EcoSmart Mini Tank Water Heater
3. Eccotemp Mini Tank Water Heater
4. Stiebel Eltron Mini-Tank Water Heater
5. Reliance 6 Water Heater

Best Overall

Bosch Tronic Mini-Tank Water Heater

Bosch Tronic Mini-Tank Water Heater

A solid performer from a well-known appliance manufacturer backed by a great warranty.

Total: 18/20

Capacity: 7 gallons 5/5
Cost: $330 2/5
Temperature Range: 65°F-145°F 4/5
Warranty: 6 years 5/5

The Bosch Tronic Mini Tank water heater comes out top as our best overall small water heater for several reasons. Firstly, this heater has the largest tank capacity out of all the heaters on this list, at 7 gallons.

Its lightweight, compact, and designed with the option of working independently or together with your household water heating system.  This tank is glass-lined for added durability and more excellent insulation.

Capacity 5/5

The Bosch Tronic Mini has the largest tank capacity at 7 gallons, with the tank capable of being mounted horizontally or vertically. All tank models feature a simple 120 VAc plug-in connection as well.

Cost 2/5

At an average price of $330, it is one of the pricier models on this list. However, you get excellent value for money with large water capacity, outstanding durability, and reliable efficiency.

Temperature Range 4/5

The Bosch Tronic Mini has a temperature range of 65-145°F, which should offer you a good range of temperatures to choose from.

Warranty 5/5

With a warranty of 6 years, it’s the highest on the list and a testament to the quality and durability of Bosch.

Second-Best

EcoSmart Mini Tank Water Heater​

EcoSmart Mini Tank Water Heater

If you don't care about brand but want to save on cost, this is a great pick.

Total: 16/20

Capacity: 6 gallons 4/5
Cost: $245 3/5
Temperature Range: 50°F-140°F 5/5
Warranty: 5 years 4/5

The EcoSmart Mini Tank Water Heater is a great all-around option for anyone who wants a balance of features, performance, and efficiency. You get a 6-gallon tank or three other models to choose from – each can be used as a stand-alone unit or added to your household water heating system for an added boost.

Capacity 4/5

The 6-gallon tank makes this model appropriate for a household with up to 5 people. The water heater tank is compact, lightweight, and can be floor, shelf, or wall-mounted.

Cost 3/5

This unit’s cost is $245, which is slightly pricier than other tanks on this list. This is much cheaper compared to bigger tank models that can smoothly go for $1,000+. 

Temperature Range 5/5

The temperature range of 50-145°F is the best on the list, which should offer you a good range of temperatures to choose from.

Warranty 4/5

This model’s warranty is five years, and similar to all the other tanks on this list. This is long enough to ensure you’re protected, should anything need to be replaced.

Third-Best

Eccotemp Mini Tank Water Heater​

Eccotemp Mini Tank Water Heater

The best small water heater for areas you don't need significant output.

Total: 16/20

Capacity: 2.5 gallons 2/5 
Cost: $170 5/5
Temperature Range: 50°F-140°F 5/5
Warranty: 5 years 4/5

The EcoTempMini Tank Water Heater has a compact design and fits virtually anywhere. The 2.5-gallon tank is designed to supply on-demand hot water to any faucet effectively.

It can provide hot water for up to two sinks or can be plumbed in series with your existing hot water system to keep a constant supply of hot water. Its compact and lightweight design means it can fit into the tightest of spots.

Capacity 2/5

The 2.5-gallon tank has a smaller than average water capacity on this list. However, this is enough to supply hot water for most usages, including dishwashers, showers, baths, faucets, and washing machines.

Cost 5/5

The EcoTemp Mini is the best budget small water heater on this list, priced at $170. This is excellent value for money considering you get a capable water heater that’s closely matched to other heaters on this list.

Temperature Range 5/5

The temperature range of 50-140°F is one of the best on the list, which is excellent for various uses.

Warranty 4/5

This model’s warranty is five years, which is the average warranty on this list. These warranties are short compared to other options.

Eccotemp has put together a very capable budget water heater. It’s capable of delivering 1440 watts of heating capacity and offers an attractive 5-year warranty. We’d recommend this model where you don’t require a large amount of water.

Fourth-Best

Stiebel Eltron Mini-Tank Water Heater

Stiebel Eltron Mini-Tank Water Heater

The best small water heater for those seeking a deal on a single-point model.

Total: 13/20

Capacity: 2.5 gallons 2/5
Cost: $225 4/5
Temperature Range: 85°F-140°F 3/5
Warranty: 5 years 4/5

The Stiebel Eltron Mini is a small water heater designed for smaller homes with low to regular hot water usage. Offering a tank size of 2.5 gallons, this water heater is best for single-point use or households with 1-3 people.

The flat back makes easy, space-saving installation whether mounted on a wall with the included bracket or just sitting on the floor. The tanks are also glass-lined to reduce corrosion and extend its use.

Capacity 2/5

Again, the 2.5-gallon tank is smaller than the average water capacity than other tanks on this list. For this reason, we recommend the Steibel Eltron Mini for smaller homes with low to regular hot water usage.

Cost 4/5

The Steibel is a reasonably priced side, considering the decent features it comes with. At $225, this is entering the budget range for small water tanks in its category.

Temperature Range 3/5

The temperature range of 85-145°F is not the best but enough for general home use. 

Warranty 4/5

This model’s warranty is five years, which is the average warranty on this list. These warranties are short compared to other options.

We love the Stiebel Eltron Mini-Tank Water Heater. It’s moderately priced and comes with a generous warranty. The price is well worth it for the sleek design and quality water heating, although other areas need addressing.

Fifth-Best

Reliance 6 Water Heater

Reliance 6 Water Heater

A great small water heater with a limited tank capacity that offers flexibility and value.

Total: 13/20

Capacity: 6 gallons 4/5
Cost: $440 1/5
Temperature Range: 90°F-150°F 3/5
Warranty: 6 years 5/5

The Reliance 6 is an efficient choice for a small water heater. This model can deliver more than enough hot water to most of your faucets, and it comes with an attractive 6-year warranty on the tank and parts.

The Reliance 6 should fit into nearly any tight space and light enough to move around. The 6-gallon tank is glass-lined to offer more insulation and protection. There’s a single 1650-watt, 120-volt copper sheathed heating element within the tank as well.

Capacity 4/5

The 6-gallon tank makes this model appropriate for a household with up to 5 people. The water heater tank is compact, lightweight, and can be floor, shelf, or wall-mounted.

Cost 1/5

The Reliance 6 is the most priced small water tank on this list, and truthfully the features on this tank don’t fully reflect the high price point. At $440, it’s not the cheapest heater; however, it has a few features worth mentioning. 

Temperature Range 3/5

The temperature range of 90-150°F is not the best but enough for general home use. 

Warranty 5/5

With a warranty of 6 years, it’s the highest on the list and one of the best features of this heater. This tank is glass-lined for added durability and more excellent insulation.

The Reliance 6 Water Heater is a solid choice and is designed to fit into tight spaces. The 6-year warranty means the company stands behind their products, and you can rest at ease.

Finding the Best Small Water Heater

Small water heaters are much more compact and portable, and for this reason, are the perfect choice when space is limited. Not only are these great for small homes, but owners can also squeeze these heaters into tight places such as food carts, RVs, and boats.

Wondering where to start your search for a new small water heater? While shopping, you should keep the following criteria in mind to choose the best appliance for your needs.

Capacity

A small water heater’s capacity is an essential feature to consider when you’re shopping around. Since small heaters are much smaller than regular heaters, their tank capacities are much smaller. Buying one that is too small for your household size is a mistake you’ll quickly regret.

For this reason, you must check the capacity of the heater’s tank before purchasing it. Having a water heater of the right capacity ensures there’s plenty of hot water to go around your home, even during peak usage. Most small heaters range in the size of 2-10 gallons.

Two to five gallons may not be enough to support heavy usage in a large household, so most homeowners have to come up with solutions such as:

1) Installing your small water heater with an additional water heater to work in tandem with each other. This increases the amount of hot water available at a given time.

2) Installing your small water heater for appliances that require light hot water usage, for example, faucets and showers.

Consider the tank’s size as you shop around to get the right size heater for your needs.

Read nextWhat Size Water Heater Do I Need?

 

Cost

The cost of small water heaters varies widely, but it’s always good to know the average price range for these units. Overall, you can expect to pay less money for a small water heater than regular-sized water heaters.

Budget small tank heaters typically range between $100-200, and the more expensive units range between $300-$500. The least priced heaters usually have smaller tank capacities and a lower level of performance.

They may have shorter lifespans as well and require regular servicing. Higher priced units typically come with more extended warranties and more durable materials. In addition to the small water heater’s cost, don’t forget about the cost of installation. The price depends on the professional and their hourly rate.

Warranty

Finally, as you look for your next small water heater, don’t forget to pay attention to the warranty. The manufacturer’s promise gives you peace of mind about potential repairs and lets you know how much the company stands behind their product.

Choose a water heater with a good warranty to ensure you won’t have to cover any repairs or replacements out of pocket for the next 3-8 years.

Read Next: How Long Does a Water Heater Last?

Table of Contents