HS-HX-7373 5-Key WiFi Instant Electric Water Heater PCBA

HS-HX-7373 5-Key WiFi Instant Electric Water Heater PCBA from SUNSAM

Buy a WiFi-ready water heater control solution designed for household showers, compact bathroom heaters and customized hot-water appliances. SUNSAM combines heater-control experience, hardware development, firmware support and PCBA manufacturing under one production system.

Product Overview

The HS-HX-7373 5-Key WiFi Instant Electric Water Heater PCBA uses an integrated control-and-display design. Model HS-HX-7373-5KEY-WIFI-C1.0 combines a digital display, five touch-control positions, sensor interfaces, flow detection, leakage detection and a WiFi interface on one compact board.

A clear display presents outlet water temperature, set temperature, water flow and operating status. Dedicated touch controls provide quick access to power, temperature adjustment, shower mode and seasonal mode selection. An integrated layout helps reduce internal wiring and supports efficient assembly inside compact water heater housings.

Wide-Voltage Power Supply Design

The selected switch-mode power supply configuration supports AC 150–280 V at 50 Hz. Sample validation included continuous operation at 280 V for eight hours without abnormal performance. A wide input range supports appliance development for markets where mains-voltage conditions may vary.

A transformer-based AC 85–265 V solution also appears as an engineering option in the test report. Final quotations, BOMs and production specifications can follow the selected power architecture required by each OEM project.

Eight Heating Power Levels

Eight programmed heating-power levels provide flexible output control:

- P1: 1.0 kW

- P2: 2.2 kW

- P3: 2.6 kW

- P4: 3.0 kW

- P5: 4.2 kW

- P6: 5.3 kW

- P7: 6.3 kW

- P8: 8.5 kW

Multiple power profiles help manufacturers match different heater elements, housing structures and regional product requirements. Final appliance power depends on the heating element, internal wiring, switching components, thermal structure and approved system configuration.

Five-Key Touch Control

Five controls cover Power, Increase, Decrease, Shower and Mode functions. Short presses adjust settings, while long presses provide continuous temperature or power adjustment where permitted by the operating state.

The controller enters standby after approximately 60 seconds without detected water flow. Touch operation supports a 4 mm glass panel or a 2 mm plastic panel, giving appliance designers more flexibility for front-panel materials and industrial design.

Two Temperature-Control Ranges

Instant heating mode provides a 30–55°C setting range for daily hot-water use. Shower mode expands the setting range to 30–75°C, with a default setting of 45°C.

Three seasonal presets simplify operation:

- Summer Mode: 38°C

- Spring/Autumn Mode: 42°C

- Winter Mode: 45°C

Users can select a preset and make further temperature adjustments according to inlet-water conditions and personal comfort preferences. Automatic calibration and parameter memory help retain constant-temperature settings after learning and calibration.

Low-Flow Activation

Heating starts at approximately 1.4 L/min and stops when water flow drops to approximately 1.2 L/min. Low-flow activation supports compact shower heaters and household hot-water equipment operating under moderate water-pressure conditions.

A dedicated flow-sensor input allows the controller to monitor water movement before heating control begins. Proper flow-sensor selection and hydraulic design remain important for stable appliance performance.

Digital Display and WiFi-Ready Control

The display layout shows outlet temperature, set temperature and flow rate in L/min. Status icons provide quick recognition of operating modes and heating conditions.

A reserved WiFi interface and pairing command support smart-control development. Holding the Shower key for three seconds during operation enters WiFi pairing mode. An external WiFi module and matching communication protocol may be required according to the final product configuration.

Protection and Fault Diagnosis

The controller includes several diagnostic and protection functions for safer water heater operation:

- E1: Overtemperature protection

- E2: Leakage protection

- E3: Inlet temperature sensor open- or short-circuit fault

- E4: Outlet temperature sensor open- or short-circuit fault

Overtemperature control uses separate thresholds for constant-temperature and shower modes. Constant-temperature mode stops heating and activates an alarm above 65°C, with automatic recovery below 55°C. Shower mode stops heating and activates an alarm above 85°C, with automatic recovery below 75°C.

Fault-code display and buzzer alerts help service technicians identify abnormal conditions. Final appliance safety performance depends on the complete electrical, hydraulic, mechanical and grounding design.

Verified Constant-Temperature Performance

Sample testing used 25°C inlet water at flow rates of 1.5 L/min and 3.0 L/min. Set temperatures covered 36°C, 40°C, 45°C and 48°C.

At 1.5 L/min, measured outlet temperatures reached 35–37°C, 40–42°C, 44–46°C and 48–50°C. At 3.0 L/min, measured outlet temperatures reached 36–37°C, 39–42°C, 44–46°C and 47–49°C.

Results demonstrate close temperature tracking under recorded sample conditions. Actual performance can vary with inlet temperature, flow rate, heater rating, supply voltage and complete appliance construction.

Environmental and Electrical Validation

The sample report records an operating-temperature range from −15°C to 65°C and a humidity range from 10% to 95% RH. High-temperature and high-humidity validation included eight hours at 65°C and 90% RH without abnormal operation.

Additional sample checks covered repeated power switching and whole-appliance dielectric-strength validation at 1,800 V, 5 mA for one minute. Such results represent sample-level verification and do not replace certification for a finished water heater.

Recommended Applications

Suitable applications include household instant shower heaters, wall-mounted bathroom water heaters, compact hot-water units, rental-apartment appliances and customized export-market heaters. WiFi readiness also supports connected appliance projects requiring remote operation through a matched module and customer-defined platform.

Configurable temperature logic, power profiles, display content, button behavior and sensor interfaces allow adaptation for different appliance structures.

OEM and ODM Development Support

SUNSAM provides hardware design, firmware development, component sourcing, PCB assembly and functional testing for customized water heater controllers. Available engineering services can cover display revisions, key layouts, temperature-control algorithms, power-stage settings, protection logic, connector definitions and WiFi communication requirements.

Customers can supply appliance specifications, heater ratings, display artwork, sensor parameters and target-market requirements. SUNSAM engineers can evaluate technical feasibility and prepare a matched PCBA proposal.

Manufacturing and Quality Capability

SUNSAM has 15 years of custom PCBA manufacturing experience, with instant electric water heater PCBA production representing about 70% of current output. Manufacturing resources cover SMT assembly, DIP insertion, wave soldering, programming, inspection and functional verification.

Material traceability, incoming inspection, in-process quality control and finished-product testing support consistent batch production. Prototype orders, engineering samples and volume manufacturing can follow confirmed project requirements. Material preparation and production scheduling are arranged according to approved forecasts and purchase orders, avoiding unsupported claims about permanent inventory.

Why Choose the HS-HX-7373 5-Key WiFi Instant Electric Water Heater PCBA?

The controller combines wide-voltage input, eight power levels, two temperature ranges, low-flow activation, digital display, WiFi pairing support and multiple protection functions. A one-board structure supports compact assembly, while configurable firmware helps appliance brands develop differentiated water heater models.

For more available solutions, visit the [SUNSAM Instant Electric Water Heater PCBA product page](https://www.sunsampcba.com/products.html).

Request a Custom Quotation

Send SUNSAM the target voltage, heater power, display requirements, temperature range, sensor specifications, WiFi platform and expected order quantity. The engineering team can review the application and prepare a customized technical and commercial proposal for the HS-HX-7373 5-Key WiFi Instant Electric Water Heater PCBA.

Frequently Asked Questions

1. What input voltage does the controller support?

The selected switch-mode configuration supports AC 150–280 V at 50 Hz. A transformer-based AC 85–265 V design can be evaluated as a separate configuration.

2. What heating power levels are available?

Eight programmed levels cover 1.0 kW, 2.2 kW, 2.6 kW, 3.0 kW, 4.2 kW, 5.3 kW, 6.3 kW and 8.5 kW. Final ratings require confirmation against the selected heater and appliance design.

3. Does the board support WiFi control?

A WiFi interface and pairing mode are supported. Final smart-control operation requires a compatible external WiFi module, communication protocol and application platform.

4. What temperature ranges are available?

Instant heating mode supports 30–55°C. Shower mode supports 30–75°C. Seasonal presets provide 38°C, 42°C and 45°C starting points.

5. Which protection functions are included?

Available functions include overtemperature protection, leakage protection, inlet temperature sensor fault detection, outlet temperature sensor fault detection, code display and audible alerts.

6. Can the HS-HX-7373 5-Key WiFi Instant Electric Water Heater PCBA be customized?

Yes. SUNSAM can evaluate customized hardware, firmware, display artwork, key functions, power profiles, sensor parameters, connectors and WiFi communication requirements for OEM and ODM projects.