CT-8545D-6KEY Instant Water Heater PCBA

HS-CT-8545D-6KEY-V1.8 Six-Key Touch Instant Electric Water Heater PCBA

The HS-CT-8545D-6KEY-V1.8 is a six-key touch-control PCBA developed for residential and commercial instant electric water heaters. It combines a wide-range switch-mode power supply, temperature adjustment, water-flow detection, automatic parameter calibration, display self-check, audible feedback, and multiple fault-protection functions in one customizable controller.

This model is suitable for water-heating products requiring a 30–55°C temperature setting range, six touch keys, and inlet and outlet temperature monitoring. SunSam can customize the hardware, firmware, display panel, interfaces, and control logic according to the appliance structure, heating element, electrical load, and target market requirements.

Key Specifications

PCBA Model: HS-CT-8545D-6KEY-V1.8

Power Supply Design: Switch-Mode Power Supply

Operating Voltage: 85–280 VAC

Control Interface: Six-Key Touch Control

Key Functions: Temperature Down, Mode, Temperature Up, 38°C Preset, Power, and 42°C Preset

Touch Panel Compatibility: 4 mm Glass Panel or 2 mm Plastic Panel

Temperature Setting Range: 30–55°C

Heater Power Configuration: 5.0 kW, 6.0 kW, and 7.0 kW

Flow Activation Threshold: 1.2 L/min

Heating Shutoff Threshold: 1.0 L/min

Temperature Sensor: 50K NTC Temperature Sensor

Buzzer Frequency: 2.5 kHz

Operating Temperature: -15°C to 65°C

Operating Humidity: 10–95% RH

Wide-Voltage Input and Flexible Power Configuration

The controller uses an 85–280 VAC switch-mode power supply design. During sample validation, it operated continuously at 280 VAC for eight hours without abnormality, supporting stable controller operation across a broad input-voltage range.

Three heater power parameters are available: 5.0 kW, 6.0 kW, and 7.0 kW. The required parameter can be selected through the key interface while the appliance is switched off.

The actual rated power depends on the heating element, power components, wiring, and complete appliance design. The PCBA parameter setting alone does not independently limit heater power.

Six-Key Touch Control and Display Feedback

The control interface includes Temperature Down, Mode, Temperature Up, 38°C Preset, Power, and 42°C Preset keys. The touch-control design can operate through a 4 mm glass panel or a 2 mm plastic panel and supports individual key activation.

When the controller is powered on, all display segments illuminate for one second and the 2.5 kHz buzzer sounds once. This sequence provides a basic visual and audible self-check before normal operation begins.

Water-Flow Activation and Temperature Control

The reference water-flow activation threshold is 1.2 L/min. Heating stops when the flow drops to approximately 1.0 L/min, allowing the controller to coordinate heating operation with the appliance’s water-flow condition.

A 50K NTC temperature sensor provides temperature feedback, while users can adjust the target temperature from 30°C to 55°C.

The temperature-control parameters support automatic calibration and memory. This allows the controller to adapt its control parameters according to the heating element, water flow, and temperature feedback.

Final temperature accuracy and heating response time should be validated using the customer’s complete water path, heater power, flow range, and appliance prototype.

Multiple Safety Protections and Fault Diagnostics

The HS-CT-8545D-6KEY-V1.8 provides fault-code indications for key sensor and heating abnormalities, helping simplify troubleshooting and after-sales inspection.

E2 — Outlet Temperature Sensor Fault

An open or short circuit in the outlet temperature sensor activates an alarm and disables heating. The controller automatically recovers after the fault is cleared.

E3 — Inlet Temperature Sensor Fault

An open or short circuit in the inlet temperature sensor activates an alarm and disables heating. The controller automatically recovers after the fault is cleared.

E4 — Over-Temperature Protection

When the detected water temperature reaches 65°C or above, the controller activates an alarm and disables heating. Normal operation automatically resumes when the temperature drops to 50°C or below.

E5 — Dry-Heating Protection

When a dry-heating condition is detected, the controller activates an alarm and disables heating. Operation can resume after the appliance is restarted.

Environmental Reliability Validation

The sample test report specifies an operating temperature range of -15°C to 65°C and an operating humidity range of 10–95% RH.

The controller operated continuously for eight hours at 65°C and 90% RH without abnormality. It also completed an internal interference test involving 30 fluorescent-lamp switching cycles at intervals of 0.5–3 seconds without abnormal operation.

These results represent internal sample validation and should not be interpreted as independent EMC or complete-appliance safety certification.

Typical Applications

- Residential instant electric water heaters

- Commercial point-of-use water-heating equipment

- Compact water heaters for apartments, hotels, and dormitories

- Kitchen and washbasin hot-water appliances

- Water heaters with glass or plastic touch-control panels

- Temperature-controlled hot-water appliances

- Instant water heaters with 5.0 kW, 6.0 kW, or 7.0 kW configurations

OEM/ODM Development and Manufacturing

Foshan Shunde SunSam Electronic Co., Ltd. has 15 years of experience in custom PCBA manufacturing. Our services cover hardware and firmware evaluation, PCB design support, component sourcing, SMT assembly, wave soldering, firmware programming, and ICT and FCT testing.

Material, manufacturing-process, and finished-product traceability can be implemented according to project requirements. The key layout, display content, temperature range, sensor parameters, water-flow thresholds, buzzer feedback, fault codes, communication interfaces, and control logic can be customized after engineering evaluation.

SunSam provides one-stop OEM and ODM services from prototype development and sample testing to volume production.

Information Required for Project Evaluation

To improve the accuracy of technical evaluation and quotation, customers are encouraged to provide:

- Appliance functional specifications

- Target-market voltage and electrical requirements

- Heating-element rated voltage, power, and wiring method

- Display panel, key layout, and enclosure drawings

- Water-flow sensor and temperature-sensor specifications

- Existing samples, BOMs, Gerber files, or schematics

- Required testing standards

- Estimated order quantity and project schedule

Contact SunSam

If you are developing an instant electric water heater, temperature-controlled hot-water appliance, or another heating-control product, send SunSam your sample, BOM, Gerber files, dimensional drawings, or functional specifications.

Our engineering team can evaluate the PCBA solution, customization requirements, sample cost, testing plan, and mass-production lead time for your project.