NOVIEEX 18kW Tankless Water Heater Review: Specs, Pros and Cons
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
This novieex 18kw tankless water review focuses on a compact electric unit designed for on-demand heating. The NOVIEEX 18 kW 4.9 GPM Tankless Water Heater delivers 18 kW of power at 240 volts. It provides a maximum flow rate of 4.9 gallons per minute. This combination targets homes needing steady hot water without the bulk of a storage tank. The unit measures 11.14 inches wide and 15.86 inches high. It mounts directly to your wall. You get precise temperature control from 77°F to 140°F. This model fits well in smaller utility spaces. It offers high thermal efficiency for daily use.
What stands out
- 18 kW heating power at 240V with a 4.9 GPM flow rate
- Adjustable temperature from 77°F to 140°F in 1°F increments
- Compact dimensions of 11.14" W x 15.86" H x 3.18" D
- 99.8% thermal efficiency for on-demand heating
- 8-layer safety system including dry-combustion prevention and IPX4 waterproofing
Who it fits
Good fit for
This unit suits small-to-medium homes, condos, or apartments with two to three simultaneous water needs. You should choose this if you have the space for a wall-mounted unit and the electrical capacity for two 40A double-pole circuit breakers. It works well for families who need a shower, kitchen sink, and laundry machine running concurrently. The slim profile saves space in basements or utility closets. It is ideal for indoor installation where you want precise temperature control without standby energy loss.
Who should skip it
You should look elsewhere if your home requires more than three simultaneous fixtures. This unit is not designed for large families with high water demand. You must have a 240V electrical system with sufficient amperage. The unit requires two 40A breakers and 8 AWG wires. If you lack the space for a 15.86-inch high unit, this will not fit. It is for indoor use only. Outdoor installation is not supported by the specifications. You need a qualified electrician for proper setup.
Verdict: The NOVIEEX 18 kW unit is a space-saving electric heater for smaller households with adequate electrical infrastructure. It delivers consistent hot water flow and precise temperature control for everyday use.
NOVIEEX 18kW Key Specs Explained
18kW Wattage
This power rating determines how quickly the unit heats water. At 18 kilowatts, it provides enough energy for small to medium homes. You can expect consistent hot water for 2 to 3 simultaneous fixtures. Compare this wattage with smaller 13kW units if you have only one bathroom, or larger 27kW models for whole-house coverage in large families.
4.9 GPM Flow Rate
Gallons per minute measures the volume of hot water delivered. A 4.9 GPM rating supports concurrent use, such as a shower and kitchen sink. This capacity suits households where multiple taps run at once. Check this figure against your local water pressure and pipe size to ensure you do not experience pressure drops during peak usage times.
240V Voltage
This electric tankless heater requires a dedicated 240-volt circuit. You must install two 40-amp breakers and 8 AWG wires. This high voltage ensures rapid heating without draining standard household circuits. Verify your electrical panel has space for these upgrades before purchase, as standard 120V outlets cannot support this power level.
77°F to 140°F Temperature Control
The adjustable range allows precise comfort settings in 1-degree increments. You can set the output from cool to very hot water. This precision prevents scalding while ensuring clean dishes. Compare this range with fixed-temperature units to see how adjustable controls help you balance energy savings with hygiene needs in different seasons.
15.86" H x 11.14" W x 3.18" D Dimensions
These ultra-thin dimensions allow wall-mounting in tight spaces. The compact profile saves floor space compared to bulky storage tanks. You can install it in closets, basements, or utility rooms. Measure your intended location carefully to ensure clearance for maintenance access and proper ventilation, as the unit is designed for indoor placement only.
Design and Build Quality
The NOVIEEX DS-18 features a silver finish and a wall-mount layout. According to the listing, the unit measures 15.86 inches in height, 11.14 inches in width, and 3.18 inches in depth. This ultra-thin profile is designed to free up significant space compared to traditional storage tanks. You can install it in basements, utility closets, or garages where floor space is limited. The compact dimensions allow for flexible placement against a wall without protruding into the room.
Controls are managed via an LED digital screen. This display shows the current water temperature, which is adjustable from 77°F to 140°F. The listing notes that you can set the temperature in precise 1°F increments. This level of control helps you avoid scalding or chilling by maintaining a constant stream of warm water. The digital interface provides clear visibility of settings during use.
Safety features include an IPX4 waterproof rating. This means the unit can handle splashes but is intended for indoor installation only. The listing also mentions an 8-layer safety system that includes dry-combustion prevention and over-temperature cutoff. These components are built into the housing to protect the internal heating elements. The design prioritizes space efficiency and precise temperature management for small to medium homes.
Setup and Everyday Use Guide
Installing this unit requires careful electrical preparation. You must connect the NOVIEEX DS-18 to a 240V power source. The 18 kW output draws up to 75 amps. You need two separate 40-amp double-pole circuit breakers. Each circuit requires 8 AWG wires with a ground connection. Consult a qualified electrician to verify your home’s electrical capacity before starting. The water connections use standard 3/4-inch NPT fittings. Mount the silver unit on an indoor wall. Its compact dimensions of 11.14 inches wide by 15.86 inches high save space in tight areas like utility closets. Daily operation is straightforward. Turn on a faucet to activate the heating element. The LED digital screen displays the current water temperature. You can adjust the heat in precise 1°F steps. The range spans from 77°F to 140°F. An internal smart system adjusts power to keep the temperature steady. This prevents sudden changes in water heat. The unit handles flows up to 4.9 gallons per minute. You can run multiple fixtures, such as a shower and a sink, at the same time. The 99.8% thermal efficiency means it only uses energy when water is flowing. Safety features include dry-combustion prevention and over-temperature cutoffs. The IPX4 rating protects against splashes. If a fault occurs, the self-diagnosis system alerts you. The unit includes a one-year warranty and lifetime technical support for any issues that arise during use.
Before You Buy This Unit
Before you buy, verify your electrical capacity. This unit needs two 40-amp breakers and 8 AWG wires. If your panel is full, hire an electrician first. Check your water pressure. Low inlet pressure reduces flow below the 4.9 GPM max. Hard water areas need regular descaling to protect the heating elements. The LED display shows temperature in 1°F steps, making adjustments easy. Indoor installation only prevents freezing damage. Compare this model with other 1 options on the page. If you need higher flow for a whole house, consider a 27 kW unit. For a single sink, a smaller 13 kW model may suffice. This 18 kW unit sits in the middle, balancing power and space. Ensure your plumbing connections match the 3/4" NPT ports. Proper maintenance keeps the 99.8% efficiency rating intact over time.
Check before you buy
- Confirm you have two 40-amp double-pole breakers available.
- Check that your electrical panel has space for new circuits.
- Verify your water pressure supports the 4.9 GPM flow rate.
- Ensure your plumbing uses 3/4 inch NPT connections.
- Plan for indoor installation to prevent freezing damage.
The product at a glance
NOVIEEX 18 kW 4.9 GPM Tankless Water Heater
Best for: small homes with 2-3 simultaneous fixtures
- Fuel Type
- Electric
- Flow Rate
- 4.9 GPM
- Wattage
- 18kW
- Installation Location
- Indoor
- Voltage
- 240V
- Temperature Control
- 77°F to 140°F, 1°F increments
View on Amazon: NOVIEEX 18 kW 4.9 GPM Tankless Water Heater Affiliate link
The NOVIEEX 18kW electric tankless water heater delivers up to 4.9 GPM at 240V. Its 15.86-inch height and 11.14-inch width allow for compact wall mounting. The unit heats water on demand with 99.8% thermal efficiency. You can adjust the temperature in 1°F increments between 77°F and 140°F. This model suits small-to-medium homes needing hot water for two to three fixtures simultaneously.
Pros
- 18kW heating power provides up to 4.9 GPM flow rate
- Adjustable temperature range from 77°F to 140°F in 1°F steps
- 99.8% thermal efficiency eliminates standby energy waste
- Compact wall-mount design measures 15.86" H x 11.14" W
Cons
- Requires two 40A double-pole circuit breakers and 8 AWG wiring
- Indoor installation only, not suitable for outdoor use
- 1-year warranty is shorter than typical industry standards
Good fit if
- You need hot water for two to three fixtures at once
- You have the electrical capacity for 75A load
- You want to save space with a wall-mounted unit
Skip if
- You require outdoor installation capability
- Your electrical panel cannot support two 40A breakers
- You need a longer warranty than one year
Verdict: NOVIEEX 18kW Electric Tankless Heater fits homes with strong electrical service that need high flow for multiple bathrooms. It delivers consistent heat for small families who can handle the installation requirements.
Specifications side by side
| Spec | NOVIEEX 18 kW 4.9 GPM Tankless Water Heater |
|---|---|
| Fuel Type | Electric |
| Flow Rate | 4.9 GPM |
| Wattage | 18kW |
| Installation Location | Indoor |
| Voltage | 240V |
| Temperature Control | 77°F to 140°F, 1°F increments |
| Dimensions | 15.86" H x 11.14" W x 3.18" D |
| Color | Silver |
| Model | DS-18 |
Frequently asked questions
Can the NOVIEEX 18kW handle three showers at once?
It is best suited for small homes with two to three simultaneous fixtures. The 4.9 GPM flow rate supports this usage if inlet water temperature is moderate. High demand with cold incoming water may reduce the effective flow rate. Verify your local climate conditions to ensure consistent performance for multiple bathrooms.
What electrical setup does this unit require?
You must connect the unit to a 240V power source. It draws up to 75 amps total. This requires two separate 40-amp double-pole circuit breakers. Each circuit needs 8 AWG wire. Ensure your electrical panel has the capacity before installation to avoid tripping breakers during peak heating cycles.
How big is the NOVIEEX DS-18 unit?
The unit measures 15.9 inches in height, 11.1 inches in width, and 11.1 inches in length. This compact, silver-colored design allows for wall mounting. The small footprint helps save space in utility rooms or closets. Check your available wall space to ensure it fits your planned installation location.
Is this heater suitable for outdoor use?
No, the NOVIEEX 18kW is designed for indoor installation only. The specifications list the installation location as indoor. Outdoor environments expose the unit to weather conditions it is not rated to withstand. Install it in a protected area to maintain performance and safety standards.
What is the maximum flow rate of this model?
The maximum flow rate is 4.9 gallons per minute. This output depends on the incoming water temperature and pressure. Higher inlet temperatures allow you to achieve this maximum flow. Lower inlet temperatures may reduce the flow rate to maintain the desired output temperature.
Does the NOVIEEX 18kW use gas or electricity?
It is an electric tankless water heater. The unit operates on 18 kW of power at 240 volts. It does not require gas lines or venting. This makes it easier to install in homes with existing strong electrical service, provided you have the correct circuit breakers and wiring.