Model 3 Tankless Electric Water Heater
Powered by Ohmic Array Technology, it's the world's most energy efficient water heater.
- Endless hot water
- Precise temperature control
- Zero maintenance required
- Connected to the Internet of Things
- Works in new construction or as a replacement to any gas or electric tank-type or tankless water heater
$ 899
Regular price
Save up to $240 a year on the cost of heating water for your home.1
The MODEL 3 Water Heater is an internet-connected tankless electric water heater which provides instant, endless hot water for houses, apartments, points-of-use, and certain commercial applications. Unlike all other water heaters on the market, the MODEL 3 does not use metal heating elements to heat water. These will rust and scale over time. Instead, graphite electrodes and electronic controls are used to pass controlled electric currents through the water. This transfer of electrical energy into the water increases the thermal energy, creating heat. No rust or scale ever forms; the water that comes out is purer, energy efficiency stays at 99% for the life of the unit, and there is never maintenance required or heating elements to change.
1$400-600 is the amount of money the average household spends on water heating each year. With the MODEL 3, you can reduce the overall cost of heating your family’s water by about 40%. That's $160-240 back in your pocket each year. Source: https://energy.gov/articles/new-infographic-and-projects-keep-your-energy-bills-out-hot-water.
NOT ALL ELECTRIC WATER HEATERS ARE MADE THE SAME.
INTRODUCING OHMIC ARRAY TECHNOLOGY
Take a peek inside our electric tankless water heater. No metal heating elements here.
The MODEL 3 Water Heater is the only water heater in the world that uses Ohmic Array Technology to heat water. All others use metal heating elements, which will rust, become covered with limescale, and eventually form hotspots. This 100-year-old technology causes sediment to form in the water, poor temperature control, and because the metal heating elements have to work harder to heat water over time, wastes energy.
ohmic array technology
Take a peek inside our electric water heater, you won’t find metal heating elements here.
With our advanced all-electric technology, the MODEL 3 is able to monitor incoming data points and make adjustments 50-60x a sec. This means we maximize energy efficiency and use less electricity to heat water.
Using graphite electrodes and electronic controls, we pass controlled electric currents through the water. This transfer of electrical energy into the water increases the thermal energy, creating heat.
With no metal heating elements to scale or fail, no maintenance is ever required. That’s why we can offer the industry's only 6-year, full-unit replacement warranty.
The MODEL 3 Water Heater is the only water heater in the world that uses Ohmic Array Technology to heat water. All others use metal heating elements, which will rust, become covered with limescale, and eventually form hotspots. This 100-year-old technology causes sediment to form in the water, poor temperature control, and because the metal heating elements have to work harder to heat water over time, wastes energy.
The best electric water heater available on the market today.
We get it. Buying a new electric water heater is about as fun as getting a tooth pulled. That’s why we designed the MODEL 3 to be the best in its class. It heats water in the simplest, purest and most efficient way.
Ohmic Array Technology
Only water heater with no heating elements to rust or scale.
Energy Efficient
Save money on your monthly utilities. Our water heater is 99% energy efficient.
Zero Maintenance
Ohmic Array Technology operates with no internal parts to fail.
Worry-Free
Industry-leading, 6-year full unit exchange warranty.
How many will you need?
The number of units you will need is based on several variables: How are you going to use your water heater? Where in your home will you put it? Where do you live? How much water you need at any given time?
How are you going to use your water heater?
Step One: Determine how you will use and where you will put your water heater
Whole Home Tankless
Install a MODEL 3 Water Heater in your home or business for endless hot water. The MODEL 3 works well in new construction and in older homes as a replacement to any gas or electric tank-type or tankless water heater. Since the unit is compact and doesn’t require venting, it can be placed almost anywhere.
Point-Of-Use Tankless
A MODEL 3 can be installed in a single location to provide immediate hot water or several units can be installed throughout the home or business for faster hot water at each location. You will save energy and waste less water.
In-Line Booster
Tired of waiting for your water to get hot? Install a MODEL 3 (or several) downstream of your existing gas or electric tank-type or tankless water heater for hot water in seconds. Once the incoming water has reached a temperature greater than the setpoint of the MODEL 3, our unit powers down and lets the existing unit provide the hot water. You’ll save time, money and energy.
In-Line Extender
Never run out of hot water again. Install a MODEL 3 on the outlet side of your existing electric or gas water heater. It acts as a backup booster, only powering up when your existing system is unable to keep up with your household demand. Plus, when your tank eventually fails or runs out of hot water, you will still have a backup hot water source.
In-Line Turobcharger
Reduce wear and tear as well as your energy costs by adding a MODEL 3 to your existing water heating system. Simply set your existing unit to a lower temperature and let the MODEL 3 “turbocharge” the incoming water to the higher setpoint temperature.
Step Two: Determine how much hot water you need (or flow rate) at any given time then look at the map to find your location. The colors will tell you how many model 3 units you will need.
2.0 Gallons Per Minute (GPM) Flow Rate
to achieve 110° F water temperature
- Need 1 MODEL 3 Water Heater, set at 100 A
- Need 1 MODEL 3 Water Heater, set at 50 A
4.0 Gallons Per Minute (GPM) Flow Rate
to achieve 110° F water temperature
- Need 2 MODEL 3 Water Heaters, both set at 100 A
- Need 2 MODEL 3 Water Heaters, one set at 100 A and one at 50 A
- Need 1 MODEL 3 Water Heater, set at 100 A
Average Temperature of Shallow Ground Water
Temperatures In Degrees Fahrenheit
Note: All ground water temperatures on map are weighted with winter fluctuations.2.0 GPM flow Rate
with 110°F water temperature
- Need 1 MODEL 3 Water Heater, set at 100A
- Need 1 MODEL 3 Water Heater, set at 50A
Average Temperature of Shallow Ground Water
Temperatures In Degrees Fahrenheit
Note: All ground water temperatures on map are weighted with winter fluctuations.4.0 GPM flow Rate
with 110°F water temperature
- Need 2 MODEL 3 Water Heaters, both set at 100A
- Need 2 MODEL 3 Water Heaters, one set at 100A and one at 50A
- Need 1 MODEL 3 Water Heater, set at 100A
Average Temperature of Shallow Ground Water
Temperatures In Degrees Fahrenheit
Note: All ground water temperatures on map are weighted with winter fluctuations.Control and monitor your hot water usage from anywhere.
Our WiFi-enabled mobile app allows you to remotely control the temperature of the water, monitor the amount of hot water and energy used each day in your home, and even estimate how much hot water is actually costing you. Turn the water heat down when the babysitter comes for peace of mind (or to get that teenager out of that too-long shower).
Technical Specs
Product Information
Product Information
- Weight
- 35 lbs.
- Connections
- 3/4” NPT male connections
- Digital Controls
- LED panel, Full Wi-Fi connectivity & mobile app
- Max Temp Rise
- 41° F rise at 4 GPM / 82° F rise at 2 GPM
- Standard Warranty
- 6-year full unit exchange; Optional 4-year extended warranty available
Operating Ranges
Operating Ranges
- Voltage
- 208-240 V
- Frequency
- 50/60 Hz
- Power:
- 6.2-24 kW
- Working Pressure
- 30-80 psi / 2.06-5.52 bar / 206-552 kPa
- Conductivity
- 80-2000 µS
- Current
- User selectable 30-100 A
MODEL 3 FAQs
Though not required, we highly recommend that you download the Heatworks app and connect the MODEL 3 to your Wi-Fi network at the time of installation or as soon as wireless internet is available. Connecting the MODEL 3 to your Wi-Fi network will allow our team to update your MODEL 3 over-the-air, ensuring your product is always operating with the most recent version of software. Also, you will be able to take advantage of additional features such as being able to remotely control temperature settings. It should be noted that the Heatworks App is only supported on the Apple and Google Play stores. Amazon or Microsoft app stores do not have a version of the Heatworks app available currently.
No. Heatworks products are designed for use with potable water only. We do not recommend using our products with unapproved chemicals or with water containing chemicals. Please contact Heatworks before using any chemicals with your Heatworks product or using the product for any application outside of what is described in the User Guide & Installation Manual so not to void your warranty.
Yes. The MODEL 3 has a minimum activation rate of 0.4 GPM.
Some competitors have minimum activation rates up to 0.75 GPM, depending on manufacturer and model. An activation rate above 0.5 GPM means that even a low flow fixture, such as a hand sink, may not trigger the tankless water heater to begin heating. With an activation rate of 0.4 GPM, we provide our customers with hot water, even at lower demand hot water draws.
No. All Heatworks products run on AC power. You can use an inverter (which converts DC power to AC power) to run Heatworks water heaters. The inverter needs to be at least as large as the kW of power needed to produce the desired amount of hot water at the desired temperature.
Heatworks requires a licensed plumber and electrician to install the MODEL 3 water heater. In some areas, HVAC professionals may have both plumbing and electrical licenses under the same roof. It is required that any licensed installer read the User Guide and Installation Manual prior to installing the unit. Additionally, all water lines in the plumbing system need to be flushed of debris entirely before installing the MODEL 3 for both retro-fit and new construction projects. This is required to keep all foreign matter from entering the MODEL 3. Failure to do so prior to installing the MODEL 3 will void the warranty.
Unfortunately, we cannot provide you with an exact cost of operation as that number will vary depending on your location and application. The MODEL 3 is a non-continuous device and only draws power when there is a need for hot water. Meaning, the MODEL 3 does not continue to draw power once hot water is turned off. According to the U.S. Energy Information Administration, 14% of the average American household energy costs are devoted to water heating. The MODEL 3 Water Heater is designed to be 99% energy efficient and can reduce the overall cost of water heating by up to 40% compared to a standard electric tank. So, it can reduce the overall energy cost of a home by up to 5.6%.
The MODEL 3 is built to perform. Unlike other water heaters, it can be adjusted from 30-100 A upon installation, depending on your specific hot water needs. The higher the power setting, the more hot water you can expect.
For a unit set to 30 amps:
- 4 gallon per minute demand will yield a 12° F rise in temperature.
- 3 gallon per minute demand will yield a 16° F rise in temperature.
- 2 gallon per minute demand will yield a 24° F rise in temperature.
- 1.25 gallon per minute demand will yield a 39° F rise in temperature.
For a unit set to 50 amps:
- 4 gallon per minute demand will yield a 20.5° F rise in temperature.
- 3 gallon per minute demand will yield a 27° F rise in temperature.
- 2 gallon per minute demand will yield a 41° F rise in temperature.
- 1.25 gallon per minute demand will yield a 65° F rise in temperature.
For a unit set to 100 amps:
- 4 gallon per minute demand will yield a 41° F rise in temperature.
- 3 gallon per minute demand will yield a 54° F rise in temperature.
- 2 gallon per minute demand will yield a 82° F rise in temperature.
- 1.25 gallon per minute demand will yield a 131° F rise in temperature.
Your water company can come test your water, or you can purchase a water conductivity meter that can give you a reading in as little as 5 seconds. We recommend ordering one from Amazon.
No, not at this time. Pool water heaters fall under a different category of UL standards and are tested accordingly. We have not yet tested the MODEL 3 as a pool heater; however, we do plan to put our units through the appropriate UL testing for this application when possible.
No. We have not yet tested our products for specific use on boats. Further, salt water should never be heated with any Heatworks products.
No, not currently. We have not yet tested our products with fish tanks.
No. Heatworks products will not function properly with GFCI, GFI, RCB, RCD, or any other ground-fault breakers. Because the water coming out of our products is grounded, there are current characteristics unique to the water heaters that cause these types of breaker to trip when the unit first powers up. We do not recommend using ground-fault breakers with Heatworks products.
No. At this time, the MODEL 3 is only certified to be installed within the United States. Any installations outside of the United States will void the MODEL 3's warranty. While we do plan on selling the MODEL 3 internationally, we do not yet have a timeline for when that will occur, unfortunately. If you would like to check in for updates, please sign up for our mailing list. You can do so at the bottom of this page!
You’re correct. Unlike other water heaters, the MODEL 3 can be adjusted from 30-100 A upon installation, depending on your specific hot water needs. The higher the power setting, the more hot water you can expect. We have found that inspectors tend to rate the MODEL 3 assuming its maximum power, 100 A. As a general rule, electric tankless water heaters shouldn’t exceed 50% of the service to the home. So, assuming yours is at 200 A, you should be fine. We always recommend hiring an electrician to do a load analysis to confirm. For more information, refer to the National Electric Code (also known as NFPA 70).
Once your MODEL 3 is installed, we do not recommend changing the current setting. (The current setting can be found underneath the unit; the installer should have circled the maximum current he selected in which the unit could be used.) Keep in mind your installer chose the breaker and branch circuit wires according to this maximum, which is particularly important to avoid over heating of the wires. This will cause nuisance or premature breaker trips.
No. According the NEC 220-83, the MODEL 3 is considered a non-continuous heating appliance. This means the MODEL 3 load is generally added to the service load at only 40% of its maximum nameplate rating. So if you choose to use the MODEL 3 at its maximum power, 100 A, 40% of this rating is 40 A. The 40 A is typically the load added to the overall service load of the dwelling, not the full load current rating of 100 A. Keep in mind that the conventional electric water heater that you are replacing is probably rated for use on a 30 A circuit and draws 4.5 kW or 18.75 A. Using the same calculation method, 40% of the nameplate rating for a conventional 4.5 kW electric tank water heater is 7.5 A. So, one MODEL 3 will add 32.5 A (40 A minus 7.5 A) additional amps to the service load since 7.5 A were already available for the existing tank.
No. The installer will determine the maximum power setting (between 30 A and 100 A) and should use the appropriate wiring based on that setting. Please refer to page 17 of the MODEL 3 Users Guide and Installation Manual for the wiring table.
Compare Top Electric Water Heaters
Whether you are replacing an old water heater, building a new home, or adding to an existing one, there are several things you should to compare before deciding on an electric water heater. Tank vs tankless water heaters, energy efficiency and reliability are just a few.
Heatworks Model 3 Tankless Electric Water Heater
Type
Tankless
Heating Technology
Ohmic Array Technology
Wi-Fi Enabled
Yes
Maximum Temperature Rise
41° F at 4 GPM, 82° F at 2 GPM
Energy Efficiency
.94 UEF for the life of the unit
Minimal Flow Rate Required
.4 GPM
Size
11“ x 16.5” x 10”
Standard Warranty
6-year full unit exchange — No need to call a plumber or electrician, just ship the unit back and we give you a new replacement.
Maintenance Required
No maintenance required.
Mobile App
Yes
Amperage
100 A
Continuous Hot Water
Yes
Single Shower Length
Unlimited
Uses Electricity at All Times
No, only when there is a hot water draw.
Stiebel Eltron 24kW Plus Electric Water Heater
Type
Tankless
Heating Technology
Metal Heating Elements
Wi-Fi Enabled
No
Maximum Temperature Rise
41° F at 4 GPM, 82° F at 2 GPM
Energy Efficiency
.94 UEF, scaling can reduce efficiency by up to 50%2
Minimal Flow Rate Required
.5 GPM
Size
16.625" x 14.5" x 4.625"
Standard Warranty
7-year limited warrany against leakage, 3-year limited warranty against defects in workmanship and materials.
Maintenance Required
Scale build-up may need to be flushed from the unit every six months to a year. Elements may need to be replaced.
Mobile App
No
Amperage
2 x 50 A
Continuous Hot Water
Yes
Single Shower Length
Unlimited
Uses Electricity at All Times
No, only when there is a hot water draw.
Trutankless 24kW Electric Water Heater
Type
Tankless
Heating Technology
Metal Heating Elements
Wi-Fi Enabled
Yes
Maximum Temperature Rise
40° F at 4 GPM, 75° F at 2 GPM
Energy Efficiency
.94 UEF, scaling can reduce efficiency by up to 50%2
Minimal Flow Rate Required
.2 GPM
Size
23.74" x 17.2" x 5.5"
Standard Warranty
2-year limited warranty on labor and 5-year limited warranty on parts.
Maintenance Required
Scale build-up may need to be flushed from the unit every six months to a year. Elements may need to be replaced.
Mobile App
Yes
Amperage
100 A
Continuous Hot Water
Yes
Single Shower Length
Unlimited
Uses Electricity at All Times
No, only when there is a hot water draw.
Rheem Performance 40-Gallon Electric Water Heater
Type
Tank
Heating Technology
Metal Heating Elements
Wi-Fi Enabled
No
Maximum Temperature Rise
N/A
Energy Efficiency
.94 UEF, scaling can reduce efficiency by up to 50%2
Minimal Flow Rate Required
N/A
Size
20.25" x 48.5" x 20.25“
Standard Warranty
6-year limited warranty on tank and parts. 1-year in home labor warranty.
Maintenance Required
Scale build-up may need to be flushed from the unit every six months to a year. Elements may need to be replaced.
Mobile App
No
Amperage
18.75 A
Continuous Hot Water
No
Single Shower Length
53 Gallons
Uses Electricity at All Times
Yes
A.O. Smith Signature 50-Gallon Electric Water Heater
Type
Tank
Heating Technology
Metal Heating Elements
Wi-Fi Enabled
No
Maximum Temperature Rise
N/A
Energy Efficiency
.94 UEF, scaling can reduce efficiency by up to 50%2
Minimal Flow Rate Required
N/A
Size
64" x 20“
Standard Warranty
6-year limited warranty
Maintenance Required
Scale build-up may need to be flushed from the unit every six months to a year. Elements may need to be replaced.
Mobile App
No
Amperage
30 A
Continuous Hot Water
No
Single Shower Length
45 Gallons
Uses Electricity at All Times
Yes
A.O. Smith Signature 40-Gallon Electric Water Heater
Type
Tank
Heating Technology
Metal Heating Elements
Wi-Fi Enabled
No
Maximum Temperature Rise
N/A
Energy Efficiency
.94 UEF, scaling can reduce efficiency by up to 50%2
Minimal Flow Rate Required
N/A
Size
49.75" x 20.5“
Standard Warranty
6-year limited warranty
Maintenance Required
Scale build-up may need to be flushed from the unit every six months to a year. Elements may need to be replaced.
Mobile App
No
Amperage
30 A
Continuous Hot Water
No
Single Shower Length
37 Gallons
Uses Electricity at All Times
Yes
2A recent study found that over time, scale deposits can reduce the energy efficiency of water heating elements by up to 50%. Source: http://www.cwt-international.com/cwt/images/stories/Download/Vulcan/EN_How_Scale_Is_Killing_Heating_Efficiency.pdf
Model 3 Resources
User Manual V1
View & Download If Your MODEL 3 Has "_RevE" or earlier on the Product Sticker Located on the Bottom of the Unit.
User Manual V2
View & Download If Your MODEL 3 Has a "_RevF" or Later on the Product Sticker Located on the Bottom of the Unit.
Register Product
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Download App
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FAQs
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