Hard water can be tough on a water heater because minerals such as calcium and magnesium may build up inside heating components, restrict water flow, and make the system work harder over time. For homeowners seeking the Best Water Heaters for Hard Water 2026, features such as scale-resistant construction, self-modulating heating, easy maintenance, and separated heating elements can make a meaningful difference.
For this guide, we evaluated seven electric tankless models based on heating power, flow capacity, temperature control, scale-management design, safety features, installation requirements, size, and overall value. The lineup includes compact point-of-use units and powerful whole-house systems, offering options for apartments, small families, and larger households. The right model depends on your home’s electrical capacity, incoming water temperature, desired flow rate, and maintenance needs. Choosing carefully now can help reduce future maintenance concerns and provide more consistent hot water performance.
| Best Overall | Best for High Demand | Best for Value |
| ThermoMate 27kW | APUS 27kW | NOVIEEX 18kW |
 |  |  |
| Scale-conscious heating design, self-modulation, and high 6.4 GPM capacity | Excellent flow capacity, precise 1°F temperature control, and strong 27kW output | Affordable price, up to 4.9 GPM flow, and an 8-layer safety system |
| $429.99 | $332.49 | $254.97 |
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7 Best Water Heaters for Hard Water in 2026, Hands-On Testing
Before starting the main section, we assessed each model for performance, flow capacity, temperature control, scale-management features, safety, installation needs, and overall value. These factors help determine which best water heaters for hard water can deliver reliable hot water while better handling the challenges of hard-water conditions.
| Water Heater | Power | Max. Flow | Best For | Price |
| ThermoMate 27kW | 27kW | 6.4 GPM | Large homes | $429.99 |
| Westinghouse 14kW WiFi | 14kW | 3.4 GPM | Smart-home users | $299.99 |
| NOVIEEX 18kW | 18kW | 4.9 GPM | Small-to-medium homes | $254.97 |
| APUS 27kW | 27kW | 6.5 GPM | High-demand households | $332.49 |
| Mount Steel 19–27kW | 19–27kW | Varies | Flexible electrical setups | $549.00 |
| Stiebel Eltron DHX 12-2 Trend | 12kW | Varies | Point-of-use applications | $266.14 |
| FOGATTI 18kW | 18kW | 4.4 GPM | Small-to-medium homes | $284.99 |
1. ThermoMate 27kW: Best Overall Water Heaters for Hard Water
The ThermoMate 27kW is the strongest all-around choice for households that need substantial hot-water capacity and want a design intended to reduce mineral-related maintenance. Its 27kW heating system can deliver up to 6.4 GPM under suitable conditions, making it a strong candidate for multiple fixtures.
The standout feature is its heating-element design. The manufacturer describes the heating element as separated from the water tube, which can help reduce direct scale, corrosion, and mineral buildup on the element. That is particularly useful in hard-water environments. Moreover, self-modulating technology adjusts energy consumption according to incoming water temperature and flow. The digital control lets users set the temperature from 80°F to 140°F in 1°F increments.
However, this is a demanding electrical appliance. The supplied specifications call for three dedicated double-pole 40A breakers, three sets of 8 AWG wiring, and recommend a 200A household service. Consequently, it is not a casual replacement for a standard electric tank heater. For a larger home with the appropriate electrical infrastructure, though, it checks many of the right boxes.
Key Specifications
- Brand: ThermoMate
- Power: 27kW
- Voltage: 208–240V
- Maximum current: 114A
- Maximum flow: Up to 6.4 GPM, depending on conditions
- Product size: 17.12 × 13.12 × 3.12 inches
- Water connections: 3/4-inch NPT
- Temperature range: 80°F–140°F
- Efficiency claim: Up to 99.8%
- Installation: Indoor wall-mounted
- Electrical requirement: Three double-pole 40A breakers
- Recommended service: 200A household service
Core Features
- Self-modulating power control
- Instant hot water
- Heating element separated from the water tube
- Digital temperature display
- 1°F temperature adjustment
- Overheating protection
- No-water heating shutoff
- ETL certification
- Compact wall-mounted construction
- 3/4-inch NPT water connections
Pros
- High 27kW heating capacity
- Strong flow potential
- Heating design aimed at reducing scale on the element
- Precise digital temperature adjustment
- Compact footprint
- No storage-tank standby losses
Cons
- Very high electrical demand
- Professional installation is strongly recommended
- May require an electrical-service upgrade
- Maximum flow depends heavily on temperature rise
Best for
- Large households and high-demand homes with adequate electrical service.
Price: $429.99
2. Westinghouse 14kW Electric: Best Smart Water Heaters for Hard Water
The Westinghouse 14kW tankless heater stands out because it combines practical heating performance with smart-home connectivity. It offers WiFi control, Alexa and Google Home compatibility, temperature memory, and a compact wall-mounted design.
At 14kW, it is less powerful than the 27kW models above. However, that can actually be an advantage for households that do not need very high simultaneous flow. The supplied testing conditions show 3.4 GPM with a 62°F inlet temperature and a 105°F outlet temperature. Another major advantage is its approach to scale and maintenance. The separated water-electricity pathway is designed to reduce internal corrosion and scale buildup. In addition, the removable inlet filter and rotor can be cleaned by hand.
The heater also includes several safety protections, including leakage, overheating, dry-fire, and over-voltage protection. Furthermore, its IPX4 rating adds moisture resistance. For a smaller household looking for a smart, compact heater rather than maximum whole-house output, this Westinghouse unit makes plenty of sense.
Key Specifications
- Brand: Westinghouse
- Power: 14kW
- Voltage: 240V
- Dimensions: 12.59 × 9.56 × 3.28 inches
- Maximum stated flow: 3.4 GPM under specified conditions
- Minimum activation flow: 0.53 GPM
- Water connections: 1/2-inch NPT
- Efficiency: 98% thermal efficiency
- Installation: Wall-mounted
- Breaker: Dedicated 60A double-pole breaker
- Wire: 6 AWG
Core Features
- WiFi connectivity
- Alexa and Google Home compatibility
- Mobile-app controls
- Temperature memory
- 3-second instant heating claim
- 98% thermal efficiency
- ETL certification
- Four-layer safety protection
- Removable inlet filter
- Separated water-electricity pathway
- Compact design
Pros
- Smart-home compatibility
- Compact footprint
- Lower power requirement than 18kW and 27kW models
- Easy-access filter maintenance
- Multiple safety protections
- Temperature memory
Cons
- Lower output than high-powered whole-house models
- Still requires dedicated 240V electrical service
- Flow varies with inlet temperature and temperature setting
- May not suit homes with very high simultaneous demand
Best for
- Apartments, smaller homes, and smart-home users who want convenient temperature control.
Price: $299.99
3. NOVIEEX 18kW Electric: Best Value Water Heaters for Hard Water
The NOVIEEX 18kW model offers a middle ground between compact electric heaters and high-output 27kW systems. With a maximum stated flow of 4.9 GPM, it is designed for small-to-medium homes, apartments, condos, garages, salons, and other indoor applications.
Its hard-water appeal comes from a combination of electronic control and protective features rather than one specific scale-treatment system. The unit uses self-modulating technology and is designed to maintain a stable temperature as flow and incoming water conditions change. The LED display supports adjustments from 77°F to 140°F in 1°F increments. In addition, the manufacturer lists eight safety protections, including water-electricity isolation, dry-combustion prevention, over-temperature cutoff, over-pressure protection, leakage protection, grounding protection, IPX4 waterproofing, and fault self-diagnosis.
However, the 18kW output still demands significant electrical capacity. The supplied requirements call for two 40A double-pole breakers and two sets of 8 AWG wires with a ground wire.
Key Specifications
- Brand: NOVIEEX
- Power: 18kW
- Voltage: 240V
- Maximum current: 75A
- Maximum flow: Up to 4.9 GPM
- Dimensions: 15.86 × 11.14 × 3.18 inches
- Water connections: 3/4-inch NPT
- Temperature range: 77°F–140°F
- Efficiency claim: Up to 99.8%
- Installation: Indoor wall-mounted
- Breaker requirement: Two 40A double-pole breakers
Core Features
- 18kW heating output
- 3-second instant-heating claim
- Up to 4.9 GPM flow
- Self-modulating operation
- LED temperature display
- 1°F temperature adjustment
- Anti-freezing protection
- Low-water-flow protection
- Overheat protection
- Leakage protection
- IPX4 waterproofing
- Fault self-diagnosis
Pros
- Good balance of power and price
- Up to 4.9 GPM stated maximum flow
- Multiple safety systems
- Precise temperature adjustment
- Compact wall-mounted construction
- Suitable for several indoor applications
Cons
- Requires substantial electrical capacity
- Actual flow varies with water temperature
- Warranty period is relatively limited at one year
- Professional electrical installation is advisable
Best for
- Small-to-medium homes and apartments that need more capacity than a compact point-of-use heater.
Price: $254.97
4. APUS 27kW Electric: Best for High Demand Water Heaters for Hard Water
The APUS 27kW is one of the most capable units in this group. Its stated maximum output reaches 6.5 GPM, and the manufacturer positions it for three to four simultaneous uses under appropriate conditions.
That makes it especially interesting for larger households where multiple fixtures may operate at once. For example, a shower, kitchen faucet, and another water fixture can place considerably more demand on a heater than a single shower. The digital control system supports temperature adjustments from 86°F to 140°F in 1°F increments. Meanwhile, intelligent self-modulation adjusts heating output according to water flow and temperature demand.
The unit also separates water and electricity and provides monitoring for temperature, water flow, and electrical conditions. Its compact wall-mounted construction saves floor space compared with a traditional storage tank.
Still, there is no getting around its electrical requirement. APUS specifies three 40A breakers and six 8 AWG conductors for the installation. Therefore, buyers should verify panel capacity before ordering. For a high-demand household that already has suitable electrical service, this model is a strong contender.
Key Specifications
- Brand: APUS
- Power: 27kW
- Voltage: 240V
- Maximum flow: Up to 6.5 GPM
- Dimensions: Approximately 17.7 × 11.4 × 3.5 inches
- Water connections: 3/4-inch NPT
- Temperature range: 86°F–140°F
- Adjustment: 1°F increments
- Breaker requirement: Three 40A breakers
- Wiring: Six 8 AWG cables
- Installation: Hardwired wall-mounted
Core Features
- Up to 6.5 GPM stated flow
- 27kW heating system
- Self-modulating technology
- Digital LED display
- Memory function
- 1°F temperature adjustment
- Water-electricity separation
- Compact wall-mounted design
- Multiple protection systems
- 24/7 customer service and warranty support
Pros
- Excellent maximum flow potential
- Strong option for multiple simultaneous uses
- Precise temperature control
- Self-modulating heating
- Compact design
- Competitive price for a 27kW unit
Cons
- High electrical requirements
- Requires multiple breakers and heavy-gauge wiring
- Flow depends on inlet temperature and selected output temperature
- Professional installation is recommended
Best for
- Large families and high-demand residential applications.
Price: $332.49
5. Mount Steel Electric: Best Adjustable Power Water Heaters for Hard Water
The Mount Steel electric tankless heater takes a slightly different approach by supporting adjustable power configurations from 19kW to 27kW. That flexibility may be useful for homeowners who want substantial heating capacity but need to match the system to the available electrical service.
Its self-modulating technology is designed to adjust output as household demand changes. In addition, the manufacturer describes a dry-heating design that separates heating elements from water and uses aluminum components to reduce mineral buildup and corrosion. That feature makes this model particularly interesting for hard-water homes. Instead of relying solely on routine cleaning, the design attempts to address one of the underlying causes of heating-element deterioration.
The compact 12.2 × 18.5-inch body also helps conserve floor space. Furthermore, electronic sensors and processors are designed to maintain temperature as water demand changes. The biggest downside is its $549 price, which places it above every other model in this roundup. Nevertheless, buyers who value adjustable power and mineral-resistant construction may consider the premium worthwhile.
Key Specifications
- Brand: Mount Steel
- Power: 19kW–27kW adjustable
- Voltage: 240V
- Dimensions: 12.2 × 18.5 inches
- Heating: Dry-heating technology
- Efficiency claim: Up to 99%
- Design: Wall-mounted
- Control: Self-modulating
- Protection: Overheat protection
Core Features
- Adjustable peak power
- 19kW–27kW configuration
- Dry-heating technology
- Reduced direct mineral exposure
- Self-modulating operation
- Temperature sensors
- Compact construction
- Silent operation
- Overheat protection
- ETL-certified components and supply-chain inspection
Pros
- Flexible power configuration
- Hard-water-friendly heating design
- High potential heating capacity
- Compact footprint
- Self-modulating operation
- Strong temperature-control concept
Cons
- Most expensive model in this roundup
- Electrical configuration needs careful planning
- Manufacturer provides fewer flow details than some competitors
- Professional installation is advisable
Best for
- Homeowners who want adjustable power and a mineral-conscious heating design.
Price: $549.00
6. Stiebel Eltron DHX 12-2 Trend POU Electric: Best Point-of-Use Water Heaters for Hard Water
The Stiebel Eltron DHX 12-2 Trend is the most specialized option in this lineup. Rather than competing directly with the highest-output whole-house heaters, it focuses on point-of-use applications and can also serve as a booster.
Its 12kW power level makes it considerably less demanding than the 27kW options. Therefore, it can make sense when you need hot water close to a particular fixture instead of supplying a large household with several simultaneous high-flow fixtures. The direct-coil heating system works with three sensors that monitor flow and inlet and outlet temperatures. Meanwhile, fully electronic temperature control and an LCD screen make adjustment straightforward.
For safety, the heater includes selectable anti-scalding limits of 109°F, 122°F, or 131°F. It also carries an IP24 water-resistance rating and includes an integrated AE3 safety system. Hard-water households can benefit from its electronic controls and direct-coil system, but it should not be mistaken for a high-capacity whole-house solution.
Key Specifications
- Brand: Stiebel Eltron
- Model: DHX 12-2 Trend
- Power: 12kW
- Voltage: 240V
- Dimensions: 8 × 14.13 inches
- Wattage: 12,000 watts
- Installation: Hardwired
- Temperature range: 68°F–140°F
- Water resistance: IP24
Core Features
- Direct-coil heating
- Flow sensor
- Inlet temperature sensor
- Outlet temperature sensor
- Fully electronic temperature control
- LCD screen
- Self-modulating energy-saving operation
- Adjustable 68°F–140°F output
- Three selectable anti-scalding limits
- Integrated AE3 safety system
- Booster capability
Pros
- Lower electrical demand than larger units
- Excellent temperature-control system
- Anti-scalding settings
- Compact dimensions
- Can serve as a booster
- Established water-heating design
Cons
- Lower capacity than the 18kW and 27kW models
- Better suited to point-of-use applications
- May not support multiple high-flow fixtures simultaneously
- Requires hardwired installation
Best for
- Point-of-use installations, smaller hot-water demands, and booster applications.
Price: $266.14
7. FOGATTI 18kW Electric: Best Compact Water Heaters for Hard Water
The FOGATTI 18kW is another well-balanced option for small-to-medium homes. It provides up to 4.4 GPM under favorable inlet-temperature conditions and uses an LED display with knob controls for straightforward operation.
One of its strongest features is precise temperature control. The manufacturer states that the system can make thousands of micro-adjustments per second to maintain the selected temperature within ±1°F under suitable operating conditions. The heater also uses an ETL-certified design with overheating and leak protection. Furthermore, the compact body measures only 17.1 × 12.9 × 3.9 inches, so it can save valuable utility-room space.
However, as with the other 18kW heaters here, electrical requirements should receive careful attention. The FOGATTI requires 240V service, two 40A two-pole breakers, and two sets of 8 AWG wires. For homeowners who want a compact unit with simple controls and good stated flow capacity, it is a solid middle-of-the-road choice.
Key Specifications
- Brand: FOGATTI
- Power: 18kW
- Voltage: 240V
- Maximum flow: Up to 4.4 GPM
- Activation flow: Minimum 0.5 GPM
- Dimensions: 17.1 × 12.9 × 3.9 inches
- Water connections: 3/4-inch NPT
- Temperature range: 86°F–140°F
- Temperature control: ±1°F stated
- Breaker requirement: Two 40A two-pole breakers
- Wiring: Two sets of 8 AWG wires
Core Features
- 18kW heating capacity
- Up to 4.4 GPM flow
- 240V operation
- ETL certification
- LED display
- Knob controls
- ±1°F stated temperature control
- Overheating protection
- Leak detection
- Compact wall-mounted construction
- Technical support
Pros
- Good capacity for small-to-medium homes
- Precise temperature adjustment
- Compact design
- ETL certified
- Straightforward controls
- Competitive price
Cons
- Requires two dedicated 40A breakers
- Maximum flow depends on inlet temperature
- Not ideal for very large households
- Hard-water maintenance remains necessary
Best for
- Small-to-medium homes seeking a compact whole-house electric tankless heater.
Price: $284.99
What Makes a Water Heater Ideal for Hard Water?
Hard water contains higher levels of minerals such as calcium and magnesium, which can accumulate inside a water heater and form scales.
Over time, mineral buildup may restrict water flow, reduce heating performance, and increase maintenance needs. Therefore, the best water heaters for hard water should combine efficient heating with features that make scale management easier.
Key features to look for include:
- Scale-conscious heating design: Components designed to reduce direct mineral buildup can help maintain consistent performance.
- Easy maintenance: Removable filters, accessible components, and straightforward flushing procedures make routine cleaning easier.
- Self-modulating operation: This adjusts power output according to water demand, helping deliver more consistent temperatures while avoiding unnecessary energy use.
- Adequate flow rate: A higher GPM rating can better support multiple fixtures, although actual performance depends on incoming water temperature and temperature rise.
- Precise temperature control: Accurate controls help maintain comfortable water temperatures and reduce unnecessary overheating.
- Durable construction: Corrosion-resistant materials and quality internal components can be beneficial in mineral-rich water conditions.
- Water treatment compatibility: A suitable whole-house softener or scale-control system can provide additional protection where water hardness is significant.
Overall, a hard-water-friendly heater should be easy to maintain, properly sized, and designed to handle mineral-related challenges rather than relying on heating efficiency alone.
How to Choose the Best Water Heaters for Hard Water
Choosing a water heater for hard water requires more than checking the price or maximum GPM. Calcium and magnesium can form scales inside heating components and water passages, which may reduce efficiency, restrict flow, and increase maintenance needs over time. When shopping for the best water heaters for hard water, pay attention to these factors:
Check Your Water Hardness
Start by testing your home’s water. Hardness is commonly measured in grains per gallon (GPG) or parts per million (PPM). Knowing the actual mineral level helps you decide whether you simply need routine descaling or should consider a water-softening system. This is especially useful when selecting electric tankless water heaters or indoor electric heaters for large rooms. For particularly hard water, check the heater manufacturer’s water-quality requirements. Some manufacturers specify limits for hardness and recommend scale-reduction equipment when those limits are exceeded.
Calculate Your Required Flow Rate
Tankless heaters are sized according to gallons per minute (GPM) rather than tank capacity. Add together the fixtures you expect to use at the same time.
For example:
- Shower: about 2–2.5 GPM
- Bathroom sink: about 0.5–1 GPM
- Kitchen sink: about 1–1.5 GPM
- Dishwasher: about 1–2 GPM
If two showers and a sink may run simultaneously, you could need around 5–6 GPM of capacity. Manufacturer sizing guidance also recommends calculating peak simultaneous demand rather than simply choosing the largest unit available.
Consider Temperature Rise
Temperature rise is the difference between your incoming water temperature and the temperature you want the heater to produce. For example, if your incoming water is 50°F and your desired output is 120°F:
- 120°F − 50°F = 70°F temperature rise
This matters because a tankless heater’s maximum GPM generally decreases as the required temperature rise increases. Therefore, don’t judge a heater solely by its advertised maximum flow rate.
Look for Scale-Resistant Features
For hard-water homes, prioritize construction that can reduce or simplify scale problems. Useful features include:
- Separated heating elements
- Dry-heating technology
- Removable inlet filters
- Accessible service components
- Self-modulating heating
- Temperature and flow sensors
For example, the ThermoMate and Mount Steel models in this roundup use heating designs intended to reduce direct mineral exposure. The Westinghouse model also includes a removable inlet filter for routine cleaning.
Self-Modulating Technology
Self-modulating heaters automatically adjust their power output according to water flow and temperature demand. This can help maintain a steadier outlet temperature while avoiding unnecessary power use. It is particularly useful when household demand changes frequently, for example, when someone turns on a sink while another person is showering. This technology can be found in options such as propane tankless water heaters and an EcoSmart tankless water heater.
Check Maintenance Requirements
Hard water makes maintenance especially important. Scale can restrict water flow and reduce heat-transfer performance, so tankless systems may need periodic flushing or descaling according to the manufacturer’s instructions. Recommended intervals vary with the model, water quality, and usage.
Before buying, check whether the heater:
- Provides easy access for servicing
- Has an inlet filter
- Includes service or isolation valves
- Supports straightforward descaling
- Specifies a maintenance schedule for hard water
Verify Electrical Requirements
This is especially important when choosing a high-output electric tankless water heater. A 27kW model can require multiple dedicated circuits and heavy-gauge wiring. For example, several models in our roundup require three 40A breakers. Therefore, have a qualified electrician verify your home’s electrical service before purchasing. Don’t assume that because a heater is compact, it has a low electrical demand.
Match the Heater to Your Household
A small apartment may not need a 27kW system. On the other hand, a large family running several showers and appliances simultaneously may quickly outgrow a lower-powered unit.
Consider:
- Number of household members
- Number of bathrooms
- Simultaneous showers
- Kitchen and laundry usage
- Incoming water temperature
- Available electrical capacity
- Water hardness
- Installation space
The goal is to choose a heater that can comfortably handle peak demand without paying for capacity you don’t need. Proper sizing is one of the most important factors in tankless-water-heater performance.
Our Top Picks
We tested and reviewed a range of options to narrow down the strongest choices for different needs and budgets.
| Best Overall | Best for High Demand | Best for Value |
| ThermoMate 27kW | APUS 27kW | NOVIEEX 18kW |
| | |
| Scale-conscious heating design, self-modulation, and high 6.4 GPM capacity | Excellent flow capacity, precise 1°F temperature control, and strong 27kW output | Affordable price, up to 4.9 GPM flow, and an 8-layer safety system |
| $429.99 | $332.49 | $254.97 |
Wrap-up
Choosing the right water heater for hard water means looking beyond the price and considering flow capacity, temperature control, efficiency, maintenance, and mineral buildup protection. Among these models, the ThermoMate 27kW stands out as our best overall pick because of its scale-conscious heating design, self-modulating operation, and impressive 6.4 GPM capacity. If your household regularly needs hot water at multiple fixtures, the APUS 27kW is an excellent choice, offering up to 6.5 GPM, precise 1°F temperature control, and powerful 27kW output. For shoppers seeking strong performance without stretching the budget, the NOVIEEX 18kW earns our Best for Value title with up to 4.9 GPM flow and an 8-layer safety system.
We always prioritize customer satisfaction and we try to offer the best solution to our readers. If you take a glimpse at Google Trends, you can observe the demand and trends of some popular water heaters. Ultimately, the best water heater depends on your household size, water demand, electrical capacity, and local water conditions. Proper installation, routine maintenance, and suitable scale control can also help support reliable performance and extend the heater’s service life.
FAQs
Can hard water damage a tankless water heater?
Yes. Mineral deposits can accumulate inside water passages and around heating components. Over time, scale can reduce heat-transfer efficiency and affect water flow. Regular maintenance and appropriate water treatment can help reduce these problems.
Do tankless water heaters need descaling in hard water?
They may. The required frequency depends on water hardness, household usage, heater design, and manufacturer recommendations. Homes with very hard water may need more frequent maintenance than homes with moderately hard water.
Is a 27kW electric tankless water heater enough for a whole house?
It can provide substantial capacity, but actual performance depends on incoming water temperature and simultaneous demand. A 27kW unit may support multiple fixtures, but the electrical service must also be capable of handling its high power requirement.
What GPM should I look for in a tankless water heater?
That depends on how many fixtures you use simultaneously. A single shower needs much less capacity than two showers plus kitchen and laundry demand. Also, remember that maximum GPM changes with inlet-water temperature and desired temperature rise.
How often should I maintain a tankless water heater?
Follow the manufacturer’s maintenance schedule. In hard-water areas, inspect the system more frequently and consider professional descaling when recommended. Filter cleaning may also be necessary depending on the model and water conditions.
Which is better for hard water: tankless or traditional water heaters?
Neither is universally better. Tankless models eliminate storage-tank standby losses and save space, but their internal passages and heating components can be affected by scale. Traditional tanks can also accumulate sediment and mineral deposits. Water quality, maintenance, demand, and installation cost should guide the decision.
Can I install a 27kW tankless water heater myself?
A 27kW unit typically requires multiple dedicated circuits, heavy-gauge wiring, proper grounding, and careful electrical work. Because of the high current involved, a qualified electrician should verify and complete the electrical installation according to local requirements.
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