10kW Dual-Group Water Heater PCBA

10kW 220V Dual-Group Instant Electric Water Heater PCBA with Temperature Memory

The PR020931 V1.1 B01MOO is a 220V dual-group instant electric water heater control board designed for high-power water heating applications requiring stable temperature regulation, intelligent memory functions and reliable safety protection.

With a rated heating configuration of 10000W, this split-type isolated PCBA integrates 30–60°C temperature adjustment, 50K NTC temperature sensing, automatic temperature calibration, memory settings, low-flow startup and multiple fault protection functions.

The controller is suitable for high-power household instant water heaters, dual-group electric shower heaters and customized OEM/ODM water heating equipment.

220V 10000W Dual-Group Heating Configuration

This control board is designed for 220V electric water heater applications with a total heating power configuration of 10000W.

The dual-group heating configuration provides a high-capacity heating solution for instant electric water heaters requiring substantial heating output.

The power configuration is specified as:

Rated Voltage: 220V

Rated Heating Power: 10000W

Heating Configuration: Dual Group

This design provides a practical control platform for manufacturers developing high-power instant water heaters with dual-group heating structures.

Dual Power Supply Options

The PCBA supports two auxiliary 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.

Note: The above voltage ranges refer to the control board power supply configurations. The rated heating system voltage is 220V.

30–60°C Temperature Adjustment

The controller supports a temperature setting range of 30–60°C.

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

Each short press changes the setting temperature by approximately 1°C.

Long-press operation supports continuous temperature adjustment, making it convenient to select the desired water temperature.

The temperature adjustment function is suitable for different hot water requirements in household instant water heating applications.

50K NTC Temperature Sensing

The control board uses a 50K NTC temperature sensing solution, with a reference resistance of 50kΩ at 25°C.

The temperature sensing system monitors water temperature and provides feedback for constant-temperature regulation.

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

This temperature sensing configuration helps maintain stable heating control under different operating conditions.

Intelligent Temperature Memory Function

One of the key features of this PCBA is its temperature memory function.

The dedicated M key provides convenient access to the stored temperature setting.

Short Press:

The controller enters the currently memorized temperature setting.

Long Press:

Holding the M key for approximately 3 seconds enters the memory temperature adjustment mode.

Users can then adjust the stored temperature using the temperature-up and temperature-down keys.

After adjustment, the new setting is automatically saved.

This function allows users to quickly return to their preferred temperature without repeatedly adjusting the settings.

Automatic Temperature Calibration

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

This function helps the system maintain its temperature-control settings during repeated operation.

Combined with the 50K NTC temperature sensor, the control system provides a practical solution for maintaining consistent outlet water temperature.

Low Water-Flow Startup

The controller starts heating when water flow reaches approximately 2.0 L/min and stops heating when water flow decreases to approximately 1.5 L/min.

The flow detection function coordinates heating operation with actual water demand.

This design helps prevent unnecessary heating when the water flow falls below the specified operating threshold.

Intelligent Three-Key Control Interface

The control panel uses a simple three-key operating structure.

Power Key:

A short press switches the water heater ON or OFF.

Temperature Increase Key:

A short press increases the target temperature by approximately 1°C. Long-press operation supports continuous adjustment.

Temperature Decrease Key:

A short press decreases the target temperature by approximately 1°C. Long-press operation supports continuous adjustment.

Memory Key (M):

A short press accesses the stored temperature setting. Holding the key for approximately 3 seconds enters memory temperature adjustment mode.

This simple control structure provides convenient operation while keeping the user interface compact.

Intelligent Digital Display and Standby

The digital display provides clear operating information and supports intelligent standby management.

The controller supports the following display functions:

• Buzzer feedback during power-up

• Screen saver activation after approximately 20 seconds without water flow

• Display wake-up through any key operation

• Display wake-up when water flow is detected

• Blank display when the unit is switched off

These functions help improve the user experience and reduce unnecessary display activity during standby.

Buzzer Feedback

The control board integrates an audible buzzer for operating feedback.

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

The buzzer provides audible feedback for key operations and selected abnormal conditions.

Multiple Temperature Sensor Protection Functions

The PCBA integrates fault detection for inlet and outlet water temperature sensors, together with over-temperature protection.

The tested fault codes include:

E1 – Inlet Temperature Sensor Open/Short Circuit

The display flashes and an alarm is activated. Heating is stopped until the fault is eliminated. The system can automatically recover after restarting.

E2 – Outlet Temperature Sensor Open/Short Circuit

The display flashes and an alarm is activated. Heating is stopped until the sensor fault is eliminated, after which the system can automatically recover.

E4 – Over-Temperature Protection

When the detected temperature reaches or exceeds approximately 70°C, the display flashes, an alarm is activated and heating is stopped.

When the temperature decreases to approximately 60°C or below, the controller automatically restores normal operation.

These protection functions help improve operating safety and simplify fault diagnosis.

Constant Temperature Performance Verification

The sample PCBA has undergone constant-temperature testing under different water-flow conditions.

The verification covered:

• 1.5 L/min water flow

• 3 L/min water flow

• Multiple target temperature settings

Measured outlet temperature results included:

At 1.5 L/min:

36°C setting: 35–37°C

40°C setting: 40–42°C

45°C setting: 44–46°C

48°C setting: 48–50°C

At 3 L/min:

36°C setting: 36–37°C

40°C setting: 39–42°C

45°C setting: 44–46°C

48°C setting: 47–49°C

These test results demonstrate the controller's temperature regulation performance under different water-flow conditions.

Environmental and Electrical 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.

Interference Testing:

30 repeated switching cycles at intervals of approximately 0.5–3 seconds without abnormal performance.

These verification results provide a reference for manufacturers evaluating the PCBA for high-power instant water heating applications.

Suitable Applications

This 220V 10kW dual-group instant water heater PCBA can be used in:

• High-power instant electric water heaters

• Dual-group electric shower heaters

• Household instant hot water systems

• High-capacity bathroom water heaters

• Electric water heating equipment

• Customized OEM and ODM water heater products

OEM and ODM Customization

Different water heater manufacturers may require different heating power configurations, temperature ranges, PCB structures, display interfaces and protection functions.

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

Customization options can include:

• Rated heating voltage and power

• Dual-group heating configuration

• Temperature setting range

• Temperature memory functions

• NTC sensor specifications

• Water-flow startup and shut-off thresholds

• Key layout and operating logic

• Digital display interface

• Temperature calibration algorithms

• Fault detection and protection logic

• 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 sample development and engineering verification through to stable mass production.

A 10kW Dual-Group Control Solution for Instant Water Heaters

With a 220V / 10000W dual-group heating configuration, 30–60°C temperature adjustment, 2.0 L/min startup flow, 50K NTC sensing, intelligent temperature memory and multiple sensor fault protections, this PCBA provides a practical control platform for high-power instant electric water heater applications.

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