3 Best Eemax 18 kW Tankless Water Heaters, Compared
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
Finding the best eemax 18 kW tankless water heaters requires matching electrical capacity to unit design. We compared 3 models using only published specifications. The Eemax 18 kW 240V Electric Tankless Water Heater ranks first because its 4.5-inch height fits tight spaces with proper electrical capacity. Each pick reflects strict spec analysis from the listing data. This guide helps you decide which unit matches your voltage needs and installation constraints. You will see how width, weight, and power type differ across brands. Read on to find the right fit for your home or business.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Eemax 18 kW 240V Electric Tankless Water Heater Best overall | tight spaces with proper electrical capacity | Check price of Eemax 18 kW 240V Electric Tankless Water Heater on Amazon |
| 2 | Eemax 18 kW Three-Phase Electric Tankless Water Heater Best budget | commercial three-phase installations | Check price of Eemax 18 kW Three-Phase Electric Tankless Water Heater on Amazon |
| 3 | Eemax 18 kW Electric Commercial Tankless Water Heater Best commercial | commercial spaces needing precise temp control | Check price of Eemax 18 kW Electric Commercial Tankless Water Heater on Amazon |
The best fit for you
- You need a compact unit for tight spaces Eemax 18 kW 240V Electric Tankless Water Heater Its slim 4.5-inch height and 13.8-pound weight fit small areas.
- You have a commercial three-phase power system Eemax 18 kW Three-Phase Electric Tankless Water Heater This model requires 480/277V three-phase service for operation.
- You want the lightest heater on the list Eemax 18 kW Electric Commercial Tankless Water Heater It weighs only 11 pounds, making it the lightest option.
Our 3 picks
Eemax 18 kW 240V Electric Tankless Water Heater
Best for: tight spaces with proper electrical capacity
- Wattage
- 18 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 240 V
- 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 HA027240 is a compact 18 kW electric tankless water heater designed for 240-volt circuits. It features a stainless steel body and a copper heat exchanger with a brass top. You can adjust the output temperature in 1-degree increments using the control knob and digital display. Its small footprint makes it suitable for tight installation spaces.
Pros
- 18 kW heating capacity for consistent hot water
- Digital display with 1-degree temperature adjustment
- Durable copper heat exchanger with brass top
- Compact dimensions of 17 x 18 x 4.5 inches
Cons
- Requires heavy-gauge 3 x 8 AWG wiring
- Made in China
- Lacks smart connectivity or app control
Good fit if
- You need a compact unit for tight spaces
- You have a dedicated 240V circuit with proper wiring
- You want precise temperature control in 1-degree steps
Skip if
- You only have 120V outlets available
- You cannot install 8 AWG gauge wiring
- You require smart home integration or remote control
Verdict: Eemax HA027240 18 kW Electric Water Heater is a solid choice for homeowners with the electrical infrastructure to support high-amperage circuits. It delivers reliable performance for single-fixture use or small households. Buyers needing precise temperature tweaks will appreciate the digital interface.
Eemax 18 kW Three-Phase Electric Tankless Water Heater
Best for: commercial three-phase installations
- Wattage
- 18 kW (what this guide is about)
- Fuel Type
- Electric
- Voltage
- 480/277V
- Dimensions
- 4.25"L x 12.25"W x 15.25"H
- Weight
- 13.3 pounds
View on Amazon: Eemax 18 kW Three-Phase Electric Tankless Water Heater Affiliate link
This Eemax model delivers 18 kW of heating power using a three-phase 480/277V electrical supply. It measures 15 inches long, 13 inches wide, and 5 inches high. The unit weighs 13.3 pounds. It is designed for commercial applications requiring three-phase power. You need a dedicated three-phase circuit to operate this heater. It is not suitable for standard residential single-phase wiring.
Pros
- 18 kW heating capacity
- Compact 15x13x5 inch footprint
- Lightweight 13.3 pound build
- Three-phase 480/277V efficiency
Cons
- Requires three-phase 480/277V power
- Not compatible with standard 240V home circuits
- Commercial grade for specialized use
Good fit if
- You have a three-phase electrical system
- You need a commercial 18 kW heater
- You are installing in a business setting
Skip if
- You only have single-phase 240V power
- You are installing in a standard home
- You need a residential unit
Verdict: Eemax 18 kW Three Phase Unit is a specialized commercial heater for buildings with three-phase power. You should choose it only if your electrical panel supports 480/277V three-phase service.
Eemax 18 kW Electric Commercial Tankless Water Heater
Best for: commercial spaces needing precise temp control
- Wattage
- 18 kW (what this guide is about)
- Voltage
- 240 V
- 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 unit delivers 18 kW of power at 240 volts for commercial use. It measures 20 by 16 by 7 inches and weighs 11 pounds. The digital control adjusts temperature from 80 to 140 degrees Fahrenheit in 1-degree increments. It offers 99.8% energy efficiency and provides endless hot water. This model suits businesses needing reliable, instant heating with precise temperature management.
Pros
- 18 kW heating output
- 1-degree temperature increment control
- 99.8% energy efficient
- Compact 20 x 16 x 7 inch size
Cons
- Limited to 240-volt electrical systems
- Heavier than residential residential units at 11 pounds
- No remote control capability listed
Good fit if
- You need commercial-grade hot water
- You require precise temperature adjustments
- You have a 240-volt electrical supply
Skip if
- You only have 120-volt outlets
- You need residential-only installation
- You require remote temperature control
Verdict: Eemax PR018240 18 kW Commercial Heater provides precise temperature control and high efficiency for commercial settings. It fits businesses that need reliable, endless hot water with specific voltage requirements.
Specifications side by side
| Spec | Eemax 18 kW 240V Electric Tankless Water Heater | Eemax 18 kW Three-Phase Electric Tankless Water Heater | Eemax 18 kW Electric Commercial Tankless Water Heater |
|---|---|---|---|
| Fuel Type | Electric | Electric | not stated |
| Wattage | 18 kW | 18KW | 18 kW |
| Voltage | 240 V | 480/277V | 240 V |
| Temperature Control | Adjustable in increments of 1 Degree | not stated | 80-140 °F, 1-degree increments |
| Dimensions | 4.5 x 17 x 18 inches | 4.25"L x 12.25"W x 15.25"H | 20 in W x 16 in L x 7 in H |
| Use | not stated | not stated | Commercial |
| Weight | 13.8 pounds | 13.3 pounds | 11 pounds |
| Color | Stainless Steel | No Finish | No Finish |
| Model | GIDDS-1030381 | ED020480T2T | PR018240 |
| Size | not stated | 4.25"L x 12.25"W x 15.25"H | not stated |
How to choose the right one
-
Verify your electrical voltage
You must match the unit’s voltage to your home’s power supply. The Eemax 18 kW 240V Electric Tankless Water Heater requires a standard 240V circuit. This is common in residential settings. The three-phase model needs 480/277V power, which is rare in homes. Check your panel before buying. Using the wrong voltage will prevent the unit from working. Ensure your electrical infrastructure supports the specific amperage and voltage required by the heater you select.
-
Check space constraints
Measure the installation area carefully before purchasing. The Eemax 18 kW 240V Electric Tankless Water Heater is only 4.5 inches high. This slim profile fits in tight spaces where bulkier units will not. The commercial model is wider at 20 inches. The three-phase unit is compact in width but taller. Verify your available width, height, and depth. The digital interface on the top model allows for precise adjustments, which is useful in confined installations.
-
Determine your usage type
Identify if you need a residential or commercial unit. The Eemax 18 kW Electric Commercial Tankless Water Heater is designed for businesses. It offers precise temperature control for high-demand environments. The 240V model is better for small households or single-fixture use. The three-phase unit is for commercial buildings with specific power systems. Choose based on your actual water heating needs. Residential units may not handle the continuous demand of a commercial setting.
-
Compare physical weight
Consider the weight if you are mounting the unit yourself. The commercial model weighs only 11 pounds. This is the lightest option on the list. The 240V residential model weighs 13.8 pounds. The three-phase unit weighs 13.3 pounds. Lighter units are easier to handle and mount on walls. Heavier units may require additional support brackets. Check the weight specifications to ensure your mounting surface can support the heater safely during installation.
-
Review temperature control needs
Look at the control interface if precision is important. The top-ranked 240V model features a digital interface. This allows you to make precise temperature tweaks. The commercial model also emphasizes precise temperature control for specific requirements. The three-phase unit lacks mentioned digital controls in its specs. If you need exact water temperature settings, prioritize models with digital displays. This feature helps maintain consistent hot water output for sensitive applications.
Frequently asked questions
Which Eemax 18 kW heater is best for tight residential spaces?
The Eemax HA027240 ranks first for compact residential use. Its slim 4.5-inch height and 18-inch length fit small areas. The unit weighs 13.8 pounds, making it easy to mount. It requires a standard 240V circuit, which is common in homes. You get precise temperature control via a digital interface.
Does any Eemax 18 kW model work with three-phase power?
Yes, the Eemax ED020480T2T is designed for three-phase installations. It requires 480/277V service, so you must verify your panel supports this. This model is intended for commercial buildings. It weighs 13.3 pounds and measures 15 inches by 13 inches by 5 inches. Do not use this in standard homes.
What is the lightest Eemax 18 kW tankless water heater?
The Eemax PR018240 is the lightest option at 11 pounds. It is built for commercial use with 240V power. The unit measures 20 inches wide, 16 inches long, and 7 inches high. Its low weight helps with mounting in various commercial settings. It offers precise temperature control for business needs.
Are all these Eemax heaters electric?
Yes, all three models listed use electric power. They all operate at 18 kW of wattage. Two models require 240V, suitable for residential or specific commercial setups. One model needs 480/277V three-phase power. You must match the voltage to your electrical supply to ensure proper operation.
Which model is best for commercial precision temperature control?
The Eemax PR018240 is best for commercial precision. It provides accurate temperature regulation for business environments. It runs on 240V electric power. The unit weighs 11 pounds and has a 20-inch width. It is designed to deliver reliable, endless hot water for commercial applications.
How wide is the top-rated Eemax 18 kW heater?
The top-rated Eemax HA027240 is 17 inches wide. It is 18 inches long and 4.5 inches high. This slim profile helps it fit in tight spaces. The unit weighs 13.8 pounds. It requires a 240V electrical connection to function correctly in residential settings.