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Model #ES 4

4 Gal. Mini-Tank Electric Water Heater

  • Floor or wall-mountable, perfect for under sink placement
  • Plugs into 120V outlet, 6-year warranty on glass lined tank
  • Same-day installation in most areas, call 1-855-400-2552 by noon
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$19239
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Product Overview

The Bosch 4 Gal. Electric Water Heater has a 4 Gal. mini-tank that fits under your sink to provide hot water right where you need it. The heater plugs right into a 120-Volt outlet and has a lightweight, compact design that's easy to handle and install. A glass-lined tank offers great insulation, while the heater's fast recovery rate eliminates long waits for hot water. A temperature-and-pressure relief valve enhances your safety.
  • 4 Gal. mini-tank fits under your sink to provide hot water right where you need it
  • Electric water heater is easy to maintain
  • Fast recovery rate eliminates long waits for hot water
  • 2-year warranty on the parts, 6-years on the tank
  • 98% thermal efficiency
  • Glass-lined tank offers great insulation
  • Plugs into a 120-Volt outlet, 2.5 ft. cord for flexibility when installing
  • Installs independently or in-line with a large hot water source
  • Can be mounted on a wall
  • Temperature pressure relief valve
  • Return policy: 90 days
  • Click here to check out our buying guide on water heaters



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Info & Guides

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BrandBoschBoschRheemBosch
Name2.5 Gal. Electric Point-of-Use Water Heater4 Gal. Mini-Tank Electric Water HeaterMiniTank 120-Volt 6 Gal. Compact Point of Use Electric Water Heater7 Gal. Electric Point-of-Use Water Heater
Price
$15866
$19239
$20999
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Save $24.01 (10%)
$21419
Ratings
(855)
(512)
(6)
(172)
Water Heater ProfileCompactCompactCompactCompact
Efficiency LevelSuper HighSuper HighSuper HighSuper High
Water Heater FeaturesGlass-Lined Tank,Overheat Protection,Temperature Pressure Relief Valve,Wall MountedGlass-Lined Tank,Overheat Protection,Temperature Pressure Relief Valve,Wall MountedGlass-Lined Tank,Wall MountedGlass-Lined Tank,Overheat Protection,Temperature Pressure Relief Valve,Wall Mounted
Nominal Tank Capacity (gallons)2467
Fuel TypeElectricElectricElectricElectric
Application TypePoint of UsePoint of UsePoint of UsePoint of Use
View ProductView ProductView ProductView Product

Specifications

Dimensions

Product Depth (in.)
13.5
Product Height (in.)
13.75
Product Width (in.)
13.75
Tank Valve Size (in.)
0.5
Water Connection Size (in.)
.5

Details

Amperage (amps)
12
Application Type
Point of Use
Efficiency Level
Super High
Finish Family
White
Fuel Type
Electric
Household Size
1-2
Indoor/Outdoor
Indoor
Maximum Temperature (F)
145
Minimum Temperature (F)
65
Nominal Tank Capacity (gallons)
4
Pack Size
1
Product Weight (lb.)
17.3
Rated Tank Capacity (gallons)
4
Required Volt Connection
120 volt
Returnable
90-Day
Tank Lining Material
Glass
Tank Warranty
6 Year
Uniform Energy Factor
0.98
Water Heater Features
Glass-Lined Tank,Overheat Protection,Temperature Pressure Relief Valve,Wall Mounted
Water Heater Profile
Compact
Wattage (watts)
1440

Warranty / Certifications

Certifications and Listings
CSA Listed,UL Listed
Labor Warranty
No Warranty
Part Warranty
2 Year

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 4.5
    out of 512 reviews
  • 88% recommend this product
Filter by:
Showing 1-10 of 512 reviews
Easy to install and works great. I actually installed...
Easy to install and works great. I actually installed it in the crawl space directly under the kitchen sink. To facilitate servicing the unit and as a proactive way to bypass the unit in the event it fails, I installed valves on the in and out connections and a third valve to pass the master water heater water to the sink. Also have a slip connection on the relief valve pipe for removal.
by GEB
Junky product with a bad warranty
Most of the good reviews here were probably written too soon after purchase to really test this product. I purchased one of these and 2 years later it completely failed. It leaked inside the case, shorted the wiring and can not be repaired. I sent pictures of the unit to Bosch and they denied responsibility for the failure, claiming that I should have taken it apart every year and replaced all the parts that were failing. Which other company forces customers to disassemble appliances and do invasive maintenance themselves under threat of voiding the warranty if they don't? Most companies void the warranty if you open their appliances and have all sorts of warning stickers cautioning customers from opening their products. This is a junk product with a name brand on it that deceives people into thinking it's good. If you buy this product, make sure to plug it into some sort of protected outlet or cord with fuses or breakers and you should consider buying a 5 year warranty as you will probably need it.
by GCdG
18 people found this helpful
Bosch 4 Gallon Heater Works, But You Have TO Do the Maintenance!
I bought the water heater about two and a half years ago. Worked fine for about a year and 8 months, then started to leak early in the morning and damaged my wood floor. I took it back since it had a 6 year warranty, but I had to contact Bosch to get a replacement. Bosch stated that they would not replace it unless I could prove that the anode was still good. I took it apart and low and behold, the anode was completely used up. This being the case, the 6 year warranty was void since I did not change out the anode. However, Bosch did send me a new (discounted) one for $130. Bosch also told me that in some cases the anode can go bad in as little as six months if you have corrosive water. Well, I replaced the old water heater with the new one and made a note to check the anode at about 1 year; however, I decided that I better check it at the 8th month. I did, and found that the anode was also gone after only 8 months! Now I will start replacing it at 6 months since it appears that I have highly corrosive water. Lesson leaned is to change out the anode every 6 months not at 1 year as Bosch recommends. Also, changing out the anode (about $18) is time consuming since I have to drain it via a syphon and you have to clean out the tank because spent anode sits on the bottom. It is a good tank, but you must check the anode at least every six months to make sure the anode is OK, if you are not sure what the corrosivity of your water is. I assume this would be the case what ever brand heater you use.
by Jongello
17 people found this helpful
Very happy with this solution for my RV problem. I have an older RV we live in and don't travel ...
Very happy with this solution for my RV problem. I have an older RV we live in and don't travel with. The original water heater finally gave out with multiple corrosion holes. The cavity left by the 10 gal. gas/electric Atwood heater was large enough to accommodate this heater neatly. The height is a close call as the dimensions do not include the height of the relief valve on top. I called Bosch and spoke to an engineer that told me the valve is about 3 inches tall so that it was just short enough to fit. My own area had some extra height so the fit was good. I had to order some pex fittings to go from 1/2" pex to 1/2" mpt plus some braided hoses. I then cut out the existing RV valve setup and connected the heater up. I plugged it in and was good to go. I was not sure the heater came on at first as the mounting had bright sunlight and the on light was too dime to see at first. I shaded the light with my hand and was then able to see it was lit. This would not be an issue with a normal indoor installation. I then bought a scroll saw from Home Depot and a 32tpi metal blade and cut the outer door panel off of the "dead" old heater and installed it back on the RV for a clean finish to the installation. From the outside you would never know of the surgery. Although it is only 4 gallons I have not run out of hot water with back to back showers or dishes. I set the temperature to halfway between normal and max and with the lower flow rate of the RV we just use more cold water to adjust the temperature and all is well. This was a great solution and saved me over $500 compared to a replacement RV heater. This heater also appears to better insulated as well with foamed in place insulation like a picnic cooler.
by CactusPete
3 people found this helpful
I was shipped a RETURNED item, not happy. I am returning this and ordering another one - hopefull...
I was shipped a RETURNED item, not happy. I am returning this and ordering another one - hopefully it is NEW, unopened, unused, un-returned. I noticed the box had been re-stapled before I opened it. Also checked the bottom and it was re-stapled. I opened the box and both pieces of styrofoam shipping were stack on top of each other instead of one on bottom one on top. Also, the user manual was crumpled - shoved back in there. Also a cap on one of the nipples wasn't screwed on straight - easy to tell the item had been opened. I didn't even take it out of the box. Taking it back to store, ordered another online. I don't want a returned item - not trusting of what problem(s) the other person had.
by TimUpstate
3 people found this helpful
Great product for under sink - instant hot water - vs waiting for the water from the other side o...
Great product for under sink - instant hot water - vs waiting for the water from the other side of the house. Installed in the supply for the sink faucet and the dishwasher.
by savingwater
1 person found this helpful
Mounted in line with hot water supply. We now have hot water almost as soon as the tap is opened....
Mounted in line with hot water supply. We now have hot water almost as soon as the tap is opened. If you have flexible sink connections from shut off valves, it's a fairly easy install for the experienced DIY. It takes up a lot of room under the sink so measure twice before you buy. Keep in mind the pressure relief valve requires a place to discharge!
by fasteddie
4 people found this helpful
The usual use for this mini-tank water heater is to use at a sink or bathroom located far from th...
The usual use for this mini-tank water heater is to use at a sink or bathroom located far from the house water heater so there will be hot water right at the tap. I have put it to a different use. I've installed a high efficiency heat pump water heater to supply heat to our house in-floor hydronic heating system. The heat pump system is heat pump only, not hybrid with electric resistance heating back-up. Since the heat pump system maximum capacity is very close to the calculated design day heat loss from the house I wanted to add a little bit of electric resistance heating into the tempered water that flows to the floors. The tempering valve is set to about 100 to 105 degrees fahrenheit and the heat pump system is able to produce water that maintains that temp most of the time. I added the mini-tank heat in the line that distributes water to the floors add I'll set the temp at about 80 degrees just to be sure there is a way to add some heat if the heat pump isn't quite producing enough heat. I'm still setting it up and we haven't had very low outside temps yet so I'll have to wait to see how well it performs. I really appreciate that this water heater can be set as low as 65 degrees, so 80 degrees will fall right into it's operational range. The attached photo shows the tank installed during leakage checking and before the pipe insulation and temp setting happened.
by JayJay
1 person found this helpful
Its great easy to instal space saver very eficient
Its great easy to instal space saver very eficient
by Vichdez
It gets the water hot
It gets the water hot
by Shawn
1 person found this helpful
Showing 1-10 of 512 reviews