LKS 380V 24kW Instant Water Heater PCBA

380V 24kW High-Power Instant Electric Water Heater PCBA with 5 Power Settings

The XX-HX-DJR-SXD13644-X8-SX1.0 is a high-power control board designed for 380V instant electric water heaters requiring high heating capacity, flexible power adjustment and stable temperature regulation.

This instant electric water heater PCBA supports five selectable heating power configurations: 12kW, 15kW, 18kW, 20kW and 24kW. With a default power setting of 24kW, the controller provides flexible heating capacity selection for different water heating requirements.

The control system integrates adjustable temperature settings, adaptive constant-temperature learning, automatic parameter calibration, low-flow startup, digital display and temperature and power memory.

It is suitable for high-capacity instant electric water heaters, commercial hot water equipment and customized OEM/ODM water heating applications.

380V High-Power Heating Control

Designed for 380V, 24kW electric water heating systems, this PCBA provides five selectable heating power configurations:

• 12kW

• 15kW

• 18kW

• 20kW

• 24kW

The default power configuration is 24kW.

Users can select the required maximum heating power through the control interface. This allows manufacturers to configure different heating capacities using the same control platform.

The five power settings provide flexibility for different heating element specifications, water flow requirements and finished product configurations.

Dual Power Supply Options

The control board supports two power supply configurations to accommodate different electrical designs.

Transformer Power Supply:

85–265VAC

Switching Power Supply:

150–280VAC / 50Hz

During sample verification, the transformer power supply configuration operated continuously for 8 hours at 265VAC without abnormal performance.

The switching power supply configuration also operated continuously for 8 hours at 280VAC without abnormal performance.

These two power supply options provide flexibility for different control board designs and electrical environments.

The above voltage ranges refer to the control board power supply configurations. The 380V specification refers to the rated heating system configuration.

Five-Level Heating Power Selection

The controller provides five selectable power limits through its control interface.

The available settings are 12kW, 15kW, 18kW, 20kW and 24kW.

The power selection function allows manufacturers to adapt the maximum heating output to different product configurations.

This flexibility is particularly useful for high-capacity instant electric water heaters requiring different heating performance levels.

30–55°C Temperature Adjustment

The controller supports a normal temperature setting range of 30–55°C.

Users can adjust the target water temperature through dedicated temperature-up and temperature-down keys.

Short-press operation provides convenient temperature adjustment, while long-press operation supports continuous adjustment.

The temperature control system works together with the water temperature sensor to monitor actual operating conditions and regulate heating output.

Adaptive Constant Temperature Control

The PCBA integrates adaptive constant-temperature learning and automatic parameter calibration.

After the initial learning process, the controller automatically calibrates its temperature-control parameters to improve outlet water temperature stability.

The sample testing covered two water-flow conditions:

• 1.5 L/min

• 3 L/min

The tested target temperatures included:

• 30°C

• 36°C

• 40°C

• 45°C

• 48°C

Under the specified test conditions, the measured outlet temperatures remained close to the corresponding target temperatures.

After the initial constant-temperature learning and calibration process, the stabilization time was within 20 seconds when the temperature difference was at least 10°C.

This adaptive control function helps maintain more consistent outlet water temperatures under different operating conditions.

Low Water-Flow Startup

The controller starts heating when water flow reaches approximately 1.5 L/min and stops heating when water flow decreases to approximately 1.2 L/min.

This flow-control mechanism helps coordinate heating operation with actual water demand.

The low-flow startup design is suitable for high-power instant water heaters that require coordinated control between water flow and heating output.

Intelligent Three-Key Control Interface

The control panel features a simple three-key operating structure:

Power Key:

A short press of approximately one second switches the water heater ON or OFF.

Temperature Increase Key:

A short press increases the target temperature. Long-press operation for more than one second supports continuous adjustment.

Temperature Decrease Key:

A short press decreases the target temperature. Long-press operation for more than one second supports continuous adjustment.

The controller also supports a power-limit setting function.

When the water heater is switched off, holding the temperature-increase key for approximately five seconds enters the power-limit setting mode.

The available power configurations are 12kW, 15kW, 18kW, 20kW and 24kW.

Digital Display and Intelligent Standby

The control system features a digital display designed to provide clear operating information.

Different display behaviors are available according to the operating state:

• During normal operation, the display shows relevant operating parameters.

• When the unit is switched on without water flow, the display enters a dimmed screen-saver state after approximately 15 seconds.

• After approximately one minute without water flow, only the outlet water temperature remains displayed.

• Pressing any key or detecting water flow wakes the display.

• When the unit is switched off, the display shows "--".

This intelligent display management helps improve the user experience while reducing unnecessary screen activity during standby.

Buzzer Feedback

The controller integrates an audible buzzer for operating feedback.

The tested buzzer frequency is 4kHz, meeting the specified operating frequency.

The sound output is designed to provide clear audible feedback without excessive noise.

50K NTC Temperature Sensing

The PCBA uses a 50K temperature sensor solution for water temperature monitoring.

The controller supports normal operation at ambient temperatures as low as approximately -15°C.

The temperature sensing system works together with the adaptive constant-temperature control logic to monitor water temperature and regulate heating operation.

Temperature and Power Parameter Memory

The controller supports automatic calibration and memory of constant-temperature parameters.

Temperature and power settings can also be retained in memory, helping maintain previously configured operating parameters.

This function provides a more consistent operating experience and reduces the need for repeated manual configuration.

Electrical and Environmental Reliability Testing

The complete unit has undergone electrical and environmental verification.

Dielectric Withstand Test:

1800V / 5mA / 1 minute

The complete unit passed the dielectric withstand test under normal ambient conditions without abnormal performance.

Temperature and Humidity Testing:

Operating temperature range: -15°C to 65°C

Operating humidity range: 10%–95% RH

High-temperature and humidity verification:

65°C / 90% RH for 8 continuous hours without abnormal performance.

These test results provide a reference for manufacturers evaluating the control board for high-power water heating applications.

Suitable Applications

This 380V 24kW instant electric water heater PCBA can be used in:

• High-power instant electric water heaters

• Large-capacity electric shower heaters

• Commercial hot water equipment

• High-output household hot water systems

• Centralized point-of-use water heating equipment

• Industrial and commercial electric water heating applications

• Customized OEM and ODM water heating products

OEM and ODM Customization

Different water heater manufacturers may require different heating capacities, electrical configurations, temperature ranges, control interfaces and PCB structures.

SunSam provides customized PCBA development and manufacturing services according to project requirements.

Customization options can include:

• Heating power configurations

• Maximum heating capacity

• Control board power supply design

• Temperature setting range

• Temperature sensor specifications

• Water-flow startup and shut-off thresholds

• Key layout and operating logic

• Digital display interface

• Constant-temperature control algorithms

• PCB dimensions and structure

• Connector configuration

• Firmware and control logic

SunSam provides one-stop PCBA manufacturing support, including component sourcing, PCB fabrication, SMT assembly, DIP processing, product assembly and functional testing.

Our OEM/ODM capabilities support customers from initial sample development and engineering verification through to stable mass production.

A High-Power 24kW Control Solution for Instant Water Heating

With 380V / 24kW heating system compatibility, five selectable power configurations from 12kW to 24kW, 30–55°C temperature adjustment, 1.5 L/min low-flow startup, 50K temperature sensing and adaptive constant-temperature learning, this PCBA provides a flexible control platform for high-capacity instant electric water heater applications.

Contact SunSam for technical evaluation, customized water heater PCBA development, sample orders and mass-production quotations.