HS-DHH-EPC13-TV-XH5-P1.3 Instant Electric Water Heater PCBA

# HS-DHH-EPC13-TV-XH5-P1.3 Instant Electric Water Heater PCBA

The HS-DHH-EPC13-TV-XH5-P1.3 is a customizable instant electric water heater PCBA developed for household and commercial point-of-use water heating equipment. Combined with the HS-HX-7373-5KEY-C1.0 display board, it integrates touch operation, temperature regulation, power configuration, water flow detection, intelligent constant-temperature control, and multiple protection functions.

## Wide-Voltage Power Supply

The standard switching power supply version supports an input voltage range of 85–280 VAC, making the controller suitable for markets with different mains voltage conditions. An optional transformer-based solution supporting 180–265 VAC is also available.

During sample verification, the switching power supply version operated continuously for eight hours at 280 VAC without abnormal behavior. The transformer version also completed an eight-hour continuous operation test at 265 VAC.

## Five-Key Touch Control

The display board features a five-key touch interface that can operate through a 4 mm glass panel or a 2 mm plastic panel. The control functions include:

- 55°C quick temperature setting

- Temperature decrease

- Power on/off

- Temperature increase

- 38°C, 42°C, and 45°C preset temperatures

- Continuous adjustment by holding the increase or decrease key

- Audible confirmation for each valid key operation

The adjustable temperature range is 30–55°C, with a default startup temperature of 38°C.

## Configurable Power Settings

The controller provides power-setting codes of 30, 40, 50, 60, 70, 75, 80, 85, and 88. In the tested firmware, code 88 represents an 8,800 W power setting.

The selected power setting is automatically saved after three seconds without key operation. The final rated output depends on the complete appliance design, including the heating element, power components, wiring, terminals, and thermal structure.

## Clear Real-Time Display

After power is applied, the display performs a one-second full-screen self-test accompanied by one buzzer tone. In standby mode without water flow, the screen displays “--”.

During operation, the display can show the outlet water temperature and real-time water flow. A flashing decimal point indicates active water flow and heating status.

The controller also supports input-voltage display through a key combination. For example, an input voltage of 220 V is displayed as “22”.

## Intelligent Constant-Temperature Control

The PCBA uses a 50K NTC sensor for temperature detection and supports automatic temperature learning, calibration, and parameter memory.

Heating starts approximately three seconds after water flow is detected. The tested activation flow rate is 1.4 L/min, while the shutoff flow rate is 1.0 L/min.

Under sample test conditions with a 25°C inlet water temperature and flow rates of 1.5–3.0 L/min, the tested 36–48°C temperature settings stabilized within 20 seconds after the initial learning calibration.

## Multiple Safety Protection Functions

The instant electric water heater control board integrates multiple protection and fault-detection functions, including:

- Over-temperature protection

- Leakage-current detection

- Inlet temperature sensor open-circuit protection

- Inlet temperature sensor short-circuit protection

- Outlet temperature sensor open-circuit protection

- Outlet temperature sensor short-circuit protection

- Zero-crossing fault detection

- Excessive water flow indication

- Audible fault warning

- Automatic or power-cycle fault recovery

The leakage detection range is 15–25 mA, with a measured sample value of 22 mA. When the detected temperature reaches 60°C or above, the controller stops heating and automatically resumes operation after the temperature decreases to 50°C.

## Sample Reliability Verification

The sample completed several internal verification tests, including:

- Eight-hour continuous operation at 280 VAC

- Eight-hour testing at 85°C and 85% RH

- Complete-appliance dielectric testing at 1,800 V and 5 mA for one minute

- Fluorescent-lamp switching interference testing repeated 30 times

- Constant-temperature testing at different flow rates and temperature settings

The specified controller operating environment is −15°C to 85°C with an operating humidity range of 10–95% RH.

## Application Scenarios

This instant electric water heater PCBA is suitable for:

- Instant electric shower heaters

- Wall-mounted electric water heaters

- Kitchen instant water heaters

- Washbasin water heaters

- Compact household hot-water appliances

- Commercial point-of-use water heaters

- Customized OEM and ODM water-heating equipment

## OEM and ODM PCBA Manufacturing

With 15 years of PCBA manufacturing and R&D experience, SunSam provides hardware development, firmware programming, PCB assembly, display-board production, functional testing, and volume manufacturing services.

The board dimensions, connectors, display icons, key layout, temperature range, power settings, protection thresholds, and control programs can be customized according to the customer’s appliance design. ICT and FCT solutions can also be developed to support stable mass production.

Contact SunSam for a customized instant electric water heater PCBA solution.