10 Best Eemax 240V Tankless Water Heaters, Compared
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Finding the best eemax 240V tankless water heaters requires matching power to your electrical panel. We compared 10 models using only published specifications to help you choose. The Eemax 15 kW Electric Tankless Water Heater leads because its 64-amp load supports moderate-flow demand in compact spaces. Each unit runs on 240V, but wattage and physical dimensions vary significantly. Some models prioritize compact footprints, while others offer higher output for whole-house needs. This guide helps you decide which heater fits your space and power capacity.
Quick picks
The best fit for you
- You want the best overall performance Eemax 15 kW Electric Tankless Water Heater Its 15 kW output and 5 x 11 x 11-inch size balance capacity with compact installation.
- You need the lowest power draw Eemax FlowCo 7.5 kW Electric Tankless Water Heater The 7.5 kW rating and 3-pound weight make it ideal for limited electrical capacity.
- You require maximum heating capacity Eemax 36 kW Stainless Steel Tankless Water Heater This 36 kW unit delivers the highest power on the list for high-demand needs.
- You want precise single-degree control Eemax 18 kW 240V Electric Tankless Water Heater The 18 kW model features single-degree digital temperature control for exact settings.
- You need commercial protected controls Eemax 27 kW 240V Electric Commercial Tankless Heater This 27 kW commercial unit offers protected internal controls and 99.8% efficiency.
Our 10 picks
Eemax 15 kW Electric Tankless Water Heater
Best for: moderate-flow demand in compact spaces
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 15.0kW
- Installation Location
- Wall mounted
- Dimensions
- 5 x 11 x 11 inches
View on Amazon: Eemax 15 kW Electric Tankless Water Heater Affiliate link
This Eemax 15 kW electric tankless water heater mounts directly to your wall. It operates on 240 volts, drawing 15.0 kW and 64 amps across dual 32-amp lines. You get a 51-degree temperature rise at 2 GPM or 65 degrees at 1.5 GPM. It features field-serviceable cartridge elements and 3/4-inch bottom connections. The compact 5 by 11 by 11-inch profile suits you when wall space is strictly limited.
Pros
- Produces a 51°F temperature rise at 2 GPM and 65°F at 1.5 GPM
- Compact 5 x 11 x 11-inch dimensions fit tight wall spaces
- Equipped with field-serviceable dual replacement cartridge elements
- Standard 3/4-inch NPT bottom compression connections
Cons
- Temperature rise falls to 34°F at 3 GPM
- Demands a 64-amp electrical service using 8 AWG wiring
Good fit if
- You need consistent hot water at flow rates around 1.5 to 2 GPM.
- You have 64 amps of 240V electrical capacity and 8 AWG wiring ready.
- You want replaceable cartridge elements for straightforward field servicing.
Skip if
- You need higher water temperatures at flow rates of 3 GPM or above.
- You cannot support a 64-amp breaker load on your electrical panel.
Verdict: Eemax 15 kW Electric Tankless Water Heater delivers reliable point-of-use or low-demand heating in an ultra-compact cabinet. Its field-serviceable elements make it easy to maintain if your electrical panel can support the 64-amp load.
Eemax FlowCo 7.5 kW Electric Tankless Water Heater
Best for: compact spaces needing lower power draw
- Voltage
- 240V (what this guide is about)
- Wattage
- 7.5kw
- Dimensions
- 3.4" x 5.9" x 12.3"
- Weight
- 3 pounds
View on Amazon: Eemax FlowCo 7.5 kW Electric Tankless Water Heater Affiliate link
The Eemax 7.5 kW 240V Electric Tankless Water Heater provides on-demand heating for targeted applications. It pairs a 7.5 kW heating capacity with standard 240V electrical wiring. At 3 pounds and measuring 3.4 by 5.9 by 12.3 inches, this unit easily mounts inside compact spaces. It suits you if you need a lightweight, low-draw 240V heater for a single fixture or isolated station.
Pros
- Draws 7.5 kW on a 240V electrical connection
- Weighs 3 pounds for lightweight wall mounting
- Compact dimensions of 3.4 by 5.9 by 12.3 inches
- Includes FlowCo technology
Cons
- Delivers 7.5 kW output, lower than higher-capacity models on this list
- Only listed in a gray finish
Good fit if
- You need a 240V water heater with a low 7.5 kW power requirement.
- You have tight wall clearances that require a compact 3-pound unit.
Skip if
- You require higher heating capacities between 15 kW and 36 kW.
- You do not have a dedicated 240V electrical hookup.
Verdict: Eemax 7.5 kW 240V Electric Tankless Water Heater delivers 7.5 kW of heating inside a compact 3-pound enclosure. It serves as a practical 240V solution when you have limited mounting space.
Eemax 36 kW Stainless Steel Tankless Water Heater
Best for: high-demand applications with adequate electrical capacity
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 36 kW
- Dimensions
- 4.5 x 21 x 18 inches
- Weight
- 17.4 pounds
View on Amazon: Eemax 36 kW Stainless Steel Tankless Water Heater Affiliate link
The Eemax 36 kW 240V Electric Tankless Water Heater provides on-demand heating for applications requiring high electrical capacity. Operating at 240 volts with a 36-kilowatt power rating, this unit delivers the highest heating output on this list. Its stainless steel casing measures 4.5 by 21 by 18 inches and weighs 17.4 pounds. It suits you if your electrical panel can support a heavy 36 kW continuous load.
Pros
- 36 kW power rating delivers the highest output on this list
- Stainless steel exterior finish
- Slim 4.5-inch profile
- Manufactured in the United States
Cons
- High 36 kW power draw requires significant electrical panel capacity
- Weighs 17.4 pounds, which is heavier than lower-wattage models
Good fit if
- You need the maximum 36 kW heating output available in this lineup.
- You have a 240-volt electrical service capable of handling a 36 kW load.
- You want a US-manufactured unit with a stainless steel body.
Skip if
- You have an electrical panel that cannot accommodate a 36 kW electric appliance.
- You only require a low-power heater for a single low-flow sink.
Verdict: Eemax 36 kW 240V Electric Tankless Water Heater delivers the highest heating capacity on this list for homes requiring maximum power. It provides continuous hot water if your electrical service can handle its 36 kW requirement.
Eemax 8.0 kW Electric Tankless Water Heater
Best for: low-demand 240-volt electric water heating
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 8.0 kW
- Dimensions
- 4.5 x 14 x 18 inches
- Weight
- 7.04 pounds
View on Amazon: Eemax 8.0 kW Electric Tankless Water Heater Affiliate link
The Eemax 8.0 kW Electric Tankless Water Heater delivers on-demand hot water using a 240-volt electric connection. It provides 8.0 kW of heating power in a compact frame measuring 18 inches long, 14 inches wide, and 4.5 inches high. At 7.04 pounds, this gray unit fits into tight utility spaces. It suits you if you need a lower-capacity 240V heater for targeted point-of-use or light hot water demands.
Pros
- Operates at 8.0 kW on a standard 240V electric circuit
- Lightweight build at 7.04 pounds
- Slim depth of 4.5 inches for compact mounting
Cons
- Lower 8.0 kW output than other 240V Eemax models on this list
- Flow rate specifications are not provided in the published data
Good fit if
- You need an 8.0 kW, 240V electric water heater for small spaces.
- You want a lightweight 7.04-pound unit that mounts easily.
Skip if
- You need higher heating output than 8.0 kW for whole-home use.
- You require a white finish rather than gray.
Verdict: Eemax 8.0 kW Electric Tankless Water Heater provides an 8.0 kW, 240-volt setup in a lightweight 7.04-pound profile. It is a solid choice when you need a compact electric option for smaller heating requirements.
Eemax 19 kW Electric Tankless Water Heater
Best for: compact 240V spaces needing thermostatic temperature regulation
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 19KW
- Temperature Control
- Thermostatic control
- Dimensions
- 5 x 11 x 11 inches
View on Amazon: Eemax 19 kW Electric Tankless Water Heater Affiliate link
This Eemax unit is an electric tankless water heater running on a 240V electrical connection. It supplies 19 kW of heating power and features thermostatic control to manage outlet water temperatures. With a compact 5 by 11 by 11-inch gray casing, it fits into tight spaces and uses bottom-mounted 3/4-inch NPT water connections. It suits you if you need mid-range electric heating with precise temperature regulation.
Pros
- 19 kW heating output on a 240V electrical supply
- Thermostatic control for precise outlet water temperatures
- Compact dimensions of 5 x 11 x 11 inches
- Standard 3/4-inch NPT bottom water connections
- Rated at 99% energy efficiency
Cons
- Plumbing connections are restricted to the bottom of the unit
- Comes only in a gray exterior finish
Good fit if
- You need a 19 kW, 240V electric water heater with thermostatic control.
- You have limited installation space measuring around 5 x 11 x 11 inches.
- You require 3/4-inch NPT plumbing connections located at the bottom.
Skip if
- You need top or side water pipe connections.
- You require more than 19 kW of heating capacity.
Verdict: Eemax 19 kW 240V Thermostatic Tankless Water Heater provides steady electric heating in a compact 5 x 11 x 11-inch footprint. Its thermostatic control and bottom connections make it a dependable choice for dedicated 240V installations.
Eemax 18 kW 240V Electric Tankless Water Heater
Best for: precise single-degree digital temperature control
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 18 kW
- Temperature Control
- Adjustable in increments of 1 Degree
- Dimensions
- 4.5 x 17 x 18 inches
- Weight
- 13.8 pounds
View on Amazon: Eemax 18 kW 240V Electric Tankless Water Heater Affiliate link
The Eemax 18 kW 240V Electric Tankless Water Heater runs on a 240-volt electrical supply and delivers 18 kW of heating power. It features a copper heat exchanger with a brass top and replaceable heating elements. You can set the digital display in one-degree increments using the control knob. This unit suits you if you need a compact 13.8-pound electric heater that requires a 3 x 8 AWG wiring setup for precise water heating.
Pros
- Digital temperature display with 1-degree adjustment knob
- Copper heat exchanger with brass top
- Replaceable heating elements
- Compact 4.5 x 17 x 18-inch dimensions
Cons
- Requires 3 x 8 AWG wiring infrastructure
- Heating output limited to 18 kW
Good fit if
- You want single-degree temperature adjustments via a digital display.
- You have a 240V electrical panel that supports 3 x 8 AWG wiring.
- You prefer a copper heat exchanger with serviceable heating elements.
Skip if
- You require more than 18 kW of heating capacity.
- You cannot accommodate 3 x 8 AWG wire runs.
Verdict: Eemax 18 kW 240V Electric Tankless Water Heater delivers 18 kW of power with single-degree digital control. Its copper heat exchanger and replaceable elements provide targeted heating for compatible 240V electrical setups.
Eemax 24 kW Electric Tankless Water Heater
Best for: 240V installations requiring 24 kW electric heating
- Voltage
- 240V (what this guide is about)
- Wattage
- 24 kW
- Fuel Type
- Electric
View on Amazon: Eemax 24 kW Electric Tankless Water Heater Affiliate link
This Eemax unit is an electric tankless water heater designed for 240-volt electrical systems. It delivers 24 kW of heating power on demand without storing water in a tank. You get continuous water heating powered strictly by electricity. This model suits you if your home setup supports a dedicated 24 kW, 240-volt electrical demand and you want a single unit running on an all-electric utility setup.
Pros
- 24 kW heating power
- Runs on standard 240 V electric service
- Tankless electric design provides on-demand heating
Cons
- Flow rate specifications are not provided in the published data
- Requires high electrical capacity to handle a 24 kW load
- No remote control or display features listed in specifications
Good fit if
- You have a 240 V electrical service that supports a 24 kW load.
- You want an all-electric tankless heater without a storage tank.
Skip if
- You need a lower-capacity electric heater under 20 kW for smaller breaker panels.
- You require a gas-powered water heating unit.
Verdict: Eemax 24 kW Electric Tankless Water Heater provides 24 kW of on-demand heating for dedicated 240 V electrical setups. It offers a straightforward electric configuration if your panel supports the high power draw.
Eemax 27 kW 240V Electric Commercial Tankless Heater
Best for: commercial facilities requiring protected 27 kW heating
- Voltage
- 240V (what this guide is about)
- Wattage
- 27 kW
- Temperature Control
- 80-140 °F, 1-degree increments
- Dimensions
- 20 in W x 20 in L x 7 in H
- Fuel Type
- Electric
- Use
- Commercial
View on Amazon: Eemax 27 kW 240V Electric Commercial Tankless Heater Affiliate link
This Eemax electric tankless water heater delivers 27 kW of heating power on a 240-volt electrical supply. Built for commercial use, it provides hot water across an adjustable range of 80 to 140 degrees Fahrenheit in single-degree steps. Operating at 99.8 percent efficiency, this 18-pound unit measures 20 by 20 by 7 inches. It suits you if you need high-output heating with internal controls for commercial spaces.
Pros
- 27 kW output on a 240V electrical connection
- 99.8% energy efficiency rating
- Temperature adjustment in 1-degree increments from 80°F to 140°F
- Protected internal temperature control
Cons
- Temperature controls are internal rather than externally accessible
- Maximum heating limit is capped at 140°F
Good fit if
- You need a 27 kW, 240V electric heater configured for commercial applications.
- You require tamper-resistant internal controls rather than exterior dials.
- You want precise temperature regulation between 80°F and 140°F.
Skip if
- You need water heated above 140°F.
- You require an external interface for frequent temperature adjustments.
Verdict: Eemax Commercial 27 kW Electric Tankless Water Heater delivers 27 kW heating capacity at 99.8% efficiency for commercial demands. Its protected internal controls prevent unwanted adjustments while maintaining precise single-degree temperature settings.
Eemax 18 kW Electric Commercial Tankless Water Heater
Best for: commercial spaces needing protected internal temperature settings
- Voltage
- 240V (what this guide is about)
- Wattage
- 18 kW
- Temperature Control
- 80-140 °F, 1-degree increments
- Dimensions
- 20 in W x 16 in L x 7 in H
- Fuel Type
- Electric
- Use
- Commercial
View on Amazon: Eemax 18 kW Electric Commercial Tankless Water Heater Affiliate link
This Eemax 18 kW commercial unit provides on-demand hot water using a 240V electric connection. Operating at 99.8% energy efficiency, it features protected internal temperature controls adjustable from 80 to 140 degrees Fahrenheit in single-degree increments. Weighing 11 pounds in a 20-by-16-by-7-inch chassis, it suits commercial setups where you need precise output temperatures without external dials exposed to tampering.
Pros
- 99.8% energy efficiency rating
- Protected internal temperature controls with 1-degree adjustments
- Temperature adjustment range from 80 to 140 degrees Fahrenheit
- Weighs 11 pounds
Cons
- Internal temperature controls prevent adjustments from outside the case
- Manufactured with no exterior finish or color coating
Good fit if
- You need an 18 kW, 240V electric system specified for commercial installations.
- You require tamper-resistant internal controls adjustable in 1-degree steps.
Skip if
- You want an external display or dial for frequent temperature adjustments.
- You require a residential-designated heater or a finished casing.
Verdict: Eemax 18 kW Commercial Tankless Water Heater delivers 99.8% energy efficiency alongside protected internal 1-degree temperature adjustments. It offers consistent 240V heating for commercial locations that do not want exposed control panels.
Eemax 19 kW 240V Electric Tankless Water Heater
Best for: compact spaces requiring thermostatic 240V heating
- Voltage
- 240V (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 19KW
- Temperature Control
- Thermostatic control
- Dimensions
- 11 x 5 x 11 inches
- Weight
- 8 pounds
View on Amazon: Eemax 19 kW 240V Electric Tankless Water Heater Affiliate link
This Eemax 19 kW 240V electric tankless water heater delivers on-demand hot water using thermostatic control. Its 11 by 5 by 11-inch frame weighs 8 pounds, making it suitable for tight utility spaces. The unit uses bottom-mounted 3/4-inch NPT plumbing connections and operates at 99 percent energy efficiency. You will find it fits well if your setup requires a compact 240-volt electric system with dedicated heating capacity.
Pros
- Thermostatic control for precise outlet temperature
- 99% energy efficient operation
- Compact 11 x 5 x 11-inch dimensions weighing 8 pounds
- Standard 3/4-inch NPT bottom water connections
Cons
- Water connections are limited strictly to the bottom
- Output is limited to 19 kW compared to higher-capacity alternatives
Good fit if
- You need an 8-pound, 240V unit that fits into a small 11 x 5 x 11-inch space.
- You require thermostatic control with standard 3/4-inch bottom connections.
Skip if
- You require more power than a 19 kW heating capacity can supply.
- You need top-mounted or side-mounted plumbing connections.
Verdict: Eemax 19 kW 240V Electric Tankless Water Heater provides precise thermostatic heating in a lightweight 8-pound chassis with 3/4-inch bottom connections.
Specifications side by side
| Spec | Eemax 15 kW Electric Tankless Water Heater | Eemax FlowCo 7.5 kW Electric Tankless Water Heater | Eemax 36 kW Stainless Steel Tankless Water Heater | Eemax 8.0 kW Electric Tankless Water Heater | Eemax 19 kW Electric Tankless Water Heater | Eemax 18 kW 240V Electric Tankless Water Heater | Eemax 24 kW Electric Tankless Water Heater | Eemax 27 kW 240V Electric Commercial Tankless Heater | Eemax 18 kW Electric Commercial Tankless Water Heater | Eemax 19 kW 240V Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | not stated | Electric | Electric | Electric | Electric | not stated | not stated | not stated | Electric |
| Wattage | 15.0kW | 7.5kw | 36 kW | 8.0 kW | 19KW | 18 kW | 24 kW | 27 kW | 18 kW | 19KW |
| Installation Location | Wall mounted | not stated | not stated | not stated | not stated | not stated | not stated | not stated | not stated | not stated |
| Voltage | 240V | 240V | 240 V | 240 V | 240V | 240 V | 240 V | 240 V | 240 V | 240V |
| Temperature Control | not stated | not stated | not stated | not stated | Thermostatic control | Adjustable in increments of 1 Degree | not stated | 80-140 °F, 1-degree increments | 80-140 °F, 1-degree increments | Thermostatic control |
| Dimensions | 5 x 11 x 11 inches | 3.4" x 5.9" x 12.3" | 4.5 x 21 x 18 inches | 4.5 x 14 x 18 inches | 5 x 11 x 11 inches | 4.5 x 17 x 18 inches | not stated | 20 in W x 20 in L x 7 in H | 20 in W x 16 in L x 7 in H | 11 x 5 x 11 inches |
| Use | not stated | not stated | not stated | not stated | not stated | not stated | not stated | Commercial | Commercial | not stated |
| Weight | not stated | 3 pounds | 17.4 pounds | 7.04 pounds | not stated | 13.8 pounds | not stated | 18 pounds | 11 pounds | 8 pounds |
| Size | 5 x 11 x 11" | not stated | not stated | not stated | 5 x 11 x 11 inches | not stated | not stated | not stated | not stated | not stated |
| Color | Gray | Gray | Stainless Steel | Gray | Gray | Stainless Steel | not stated | not stated | No Finish | White |
| Model | EX144TC | B2282392 | HA036240 | HA008240 | EX190T2 | GIDDS-1030381 | HA024240 | PR027240 | PR018240 | EX190T2 S |
If you need supplemental room warmth on the same electrical panel, compare the best 240V space heaters by wattage specifications.
How to Choose the Right Eemax Unit
-
Check Electrical Panel Capacity
You must verify your electrical panel can handle the unit’s amperage draw. The Eemax 15 kW model requires a 64-amp circuit, which is substantial for residential setups. Smaller units like the 7.5 kW model draw significantly less power, making them safer for older panels. Always consult an electrician to confirm your breaker size matches the heater’s requirements. Installing a high-wattage unit on an undersized circuit will trip breakers immediately. Ensure your wiring gauge is appropriate for the specific kilowatt rating you select.
-
Measure Installation Space
Dimensions vary significantly across this lineup. The Eemax 15 kW and 19 kW thermostatic models share a compact 5 x 11 x 11-inch footprint, fitting well in tight closets. In contrast, commercial models like the 27 kW unit measure 20 x 7 x 20 inches, requiring more wall space. Measure your intended mounting area before purchasing. The 7.5 kW model is also lightweight at just 3 pounds, easing installation in confined spots. Accurate measurements prevent fitting issues during the final setup phase.
-
Identify Your Usage Type
Determine if you need a residential or commercial-grade unit. The Eemax 27 kW heater is explicitly rated for commercial facilities, offering 99.8% efficiency and protected internal controls. Residential models like the 15 kW unit focus on point-of-use heating. Commercial units often feature durable stainless steel exteriors and protected settings to prevent unauthorized adjustments. If you are outfitting a business or high-traffic location, choose a commercial badge model. For home bathrooms, a standard residential unit suffices.
-
Select Temperature Control Style
Choose between digital precision and mechanical thermostats. The Eemax 18 kW model offers single-degree digital control for exact temperature settings. The 19 kW thermostatic version provides steady heating with mechanical regulation. Digital controls allow you to dial in specific water temperatures, while thermostatic models maintain a set range automatically. Consider which interface you prefer for daily adjustments. Digital displays offer clarity, whereas thermostatic knobs provide simplicity. Match the control style to your comfort level and technical preference.
-
Evaluate Maintenance Access
Check if the heating elements are serviceable. The Eemax 15 kW model features field-serviceable elements, allowing you to maintain performance over time without replacing the entire unit. This design simplifies upkeep if scaling or wear occurs. Other models may not highlight this feature in their specs. Regular maintenance ensures consistent hot water delivery. Verify the element accessibility before buying. A serviceable design extends the lifespan of your investment and reduces long-term downtime. This practical feature is valuable for owners who prefer DIY maintenance.
Frequently asked questions
Can Eemax 240V tankless heaters handle commercial use?
Yes, several models are designed for commercial facilities. The 27 kW unit offers 99.8% efficiency with protected internal controls to prevent unwanted adjustments. The 18 kW commercial model also features 99.8% energy efficiency and protected internal temperature settings. These units provide consistent heating for locations that prefer not to expose control panels.
What is the smallest Eemax 240V unit available?
The FlowCo 7.5 kW model is the most compact option. It measures 5.9 by 3.4 by 12.3 inches and weighs only 3 pounds. This lightweight enclosure serves as a practical solution when you have limited mounting space or need lower power draw for specific applications.
Do Eemax 240V heaters have digital temperature controls?
Some models feature precise digital control while others use thermostatic regulation. The 18 kW unit offers single-degree digital control for targeted heating. Other models, such as the 19 kW thermostatic heater, provide steady electric heating with thermostatic control. You should check the specific model attributes to confirm the type of regulation.
Which Eemax model has the highest wattage?
The 36 kW Stainless Steel Tankless Water Heater provides the highest heating capacity on this list. It is designed for homes requiring maximum power and continuous hot water. This unit demands significant electrical service capacity, so you must verify your panel can handle the 36 kW requirement before installation.
Are the heating elements serviceable on Eemax units?
Yes, certain models feature field-serviceable elements to simplify maintenance. The 15 kW best overall model includes this feature, making it easy to maintain if your electrical panel supports the 64-amp load. Replaceable elements are also noted in the 18 kW unit with a copper heat exchanger for targeted heating.
What is the weight of the largest Eemax 240V heater?
The 36 kW Stainless Steel model weighs 17.4 pounds. It measures 21 inches wide by 18 inches long. This is one of the heavier units listed, designed for high-demand applications. Other commercial models, like the 27 kW unit, weigh 18 pounds and measure 20 by 20 inches.