HS-SH-5534 Instant Electric Water Heater PCBA

HS-SH-5534 Instant Electric Water Heater PCBA for 3–7 kW Systems

HS-SH-5534 Instant Electric Water Heater PCBA from SUNSAM gives OEM buyers a configurable control solution for 3–7 kW instant water heaters. AC 85–280 V input, six-key touch control, two heating modes and multiple power settings support household and export-oriented water heater development.

The HS-SH-5534-GL-V1.0 integrated control board combines water-flow detection, temperature regulation, heating-power control, touch operation, parameter memory and fault monitoring. Hardware and firmware functions can also be adapted according to the appliance structure and target application.

One Control Platform for 3–7 kW Heating Systems

The HS-SH-5534 supports heating elements rated from 3 to 7 kW. Engineers can select the physical heater rating and then configure an actual output level within the permitted power range.

The default heater setting is 6 kW. Available configurations include:

| Heater Rating | Selectable Heating Power |

|---|---|

| 3 kW | 3 kW |

| 4 kW | 3 or 4 kW |

| 5 kW | 3, 4 or 5 kW |

| 6 kW | 3, 4, 5 or 6 kW |

| 7 kW | 3, 4, 5, 6 or 7 kW |

A long press on the Decrease and Power keys opens the heater-rating configuration menu. A long press on the Decrease and Increase keys opens the actual heating-power selection menu.

The configurable platform allows one water heater control board to support several appliance power versions. Final output must remain within the rated capacity of the heating element, wiring, terminals and other power components.

Wide-Voltage Switch-Mode Power Supply

The tested switch-mode power supply version operates from AC 85–280 V. The wide input range supports water heater projects intended for markets with varying mains-voltage conditions.

The sample operated continuously for eight hours at AC 280 V without abnormal performance. Final voltage ratings, electrical clearances, component specifications and applicable safety standards require confirmation for every complete appliance.

The test report also lists a transformer-based version with an AC 85–265 V input range. The transformer-based and switch-mode versions represent different hardware configurations and should not share the same product specification.

Constant-Temperature and Stepped-Power Heating

The HS-SH-5534 Instant Electric Water Heater PCBA supports two heating-control methods:

- Constant-temperature heating

- Stepped-power heating

The adjustable temperature range covers 30–55°C. A dedicated Power Level key allows users to enter or exit stepped-power heating mode.

The control system also provides two preset temperature keys:

- 38°C preset

- 42°C preset

The two shortcuts offer quick access to commonly used water temperatures. Increase and Decrease keys support single-step adjustment and continuous adjustment through long-press operation.

Six-Key Touch-Control Interface

The control interface contains six touch keys:

- Power

- Increase

- Decrease

- 38°C preset

- 42°C preset

- Power Level

The touch keys can operate through a surface-mounted 4 mm glass panel or a 2 mm plastic panel. Appliance manufacturers can therefore develop different front-panel materials, key layouts and exterior designs around the same control platform.

An audible buzzer provides feedback during key operation and fault alarms. Display graphics, icons and interface layouts can be customized according to project requirements.

Low-Flow Activation and Water-Flow Control

The water heater PCBA starts heating when the detected water flow reaches approximately 1.4 L/min. Heating stops when the flow decreases to approximately 1.2 L/min.

The defined start and stop thresholds help coordinate heating output with actual water demand. Final activation performance depends on the flow sensor, inlet pressure, pipeline design, heating assembly and installation environment.

Temperature Detection and Parameter Memory

The control system uses a 50 kΩ NTC temperature sensor for temperature measurement. Automatic calibration and memory functions retain constant-temperature control parameters after setup.

According to the sample test report, the measured outlet-temperature deviation remained within approximately ±2°C at the recorded test points. Test conditions included an inlet water temperature of 25°C and flow rates of 1.5 L/min and 3 L/min.

Recorded stabilization times ranged from approximately 6 to 20 seconds after initial learning and calibration.

Recorded Temperature-Control Results

| Flow Rate | Set Temperature | Measured Temperature | Stabilization Time |

|---|---:|---:|---:|

| 1.5 L/min | 36°C | 35–37°C | 15–20 s |

| 1.5 L/min | 40°C | 40–42°C | 10–15 s |

| 1.5 L/min | 45°C | 44–46°C | 8–12 s |

| 1.5 L/min | 48°C | 48–50°C | 6–9 s |

| 3 L/min | 36°C | 36–37°C | 15–20 s |

| 3 L/min | 40°C | 39–42°C | 8–12 s |

| 3 L/min | 45°C | 44–46°C | 8–10 s |

| 3 L/min | 48°C | 47–49°C | 6–8 s |

Final temperature-control performance depends on inlet water temperature, water flow, heating capacity and the complete appliance structure.

Multiple Protection Functions

The instant electric water heater control board provides fault monitoring for temperature sensors, overheating and electrical leakage.

Available protection functions include:

- Outlet water over-temperature protection

- Leakage fault protection

- Outlet temperature sensor open-circuit detection

- Outlet temperature sensor short-circuit detection

- Heating cut-off during detected faults

- Audible fault alarm

- Fault-code indication

- Automatic recovery for supported fault conditions

When the outlet temperature reaches or exceeds 65°C, E1 protection activates the alarm and stops heating. Normal operation resumes automatically after the temperature falls below 55°C.

An outlet temperature sensor open-circuit or short-circuit condition activates E4 protection. The controller flashes the fault indication, sounds the alarm and stops heating until the fault is cleared.

The leakage protection operating range is 15–30 mA. The tested sample recorded a leakage trip current of 23 mA. Complete-unit safety validation remains necessary before mass production.

Main Technical Specifications

| Parameter | Specification |

|---|---|

| Product Name | HS-SH-5534 Instant Electric Water Heater PCBA |

| Internal PCBA Model | HS-SH-5534-GL-V1.0 |

| Control Board Structure | Integrated Control Board |

| Power Supply Design | Switch-Mode Power Supply |

| Operating Voltage | AC 85–280 V |

| Supported Heater Ratings | 3, 4, 5, 6 and 7 kW |

| Default Heater Setting | 6 kW |

| Heating Modes | Constant-Temperature and Stepped-Power Heating |

| Temperature Setting Range | 30–55°C |

| Preset Temperatures | 38°C and 42°C |

| Activation Flow Rate | 1.4 L/min |

| Shut-Off Flow Rate | 1.2 L/min |

| Temperature Sensor | 50 kΩ NTC at 25°C |

| Leakage Protection Range | 15–30 mA |

| Control Interface | Six-Key Touch Control |

| Panel Compatibility | 4 mm Glass or 2 mm Plastic |

| Operating Temperature | −15°C to 65°C |

| Operating Humidity | 10%–95% RH |

Sample Testing and Verification

The sample test report records the following results:

- Eight hours of continuous operation at AC 280 V without abnormal performance

- Eight hours of operation at 65°C and 90% relative humidity without abnormal performance

- Normal operation at an ambient temperature of −15°C

- No abnormal performance after 30 switching-interference cycles

- Complete-unit dielectric withstand test at 1,800 V, 5 mA for one minute

- Leakage protection trip test at 23 mA

- Constant-temperature verification at 1.5 L/min and 3 L/min

Recorded results apply to the tested sample and stated test conditions. Final performance and regulatory compliance require verification after integration into the complete water heater.

Water Heater PCBA Development and Production

Water heater control boards account for approximately 70% of SUNSAM’s current PCBA production. Fifteen years of customized PCBA experience support product development from initial requirement analysis to prototype and batch manufacturing.

SUNSAM provides:

- Hardware circuit development

- Embedded firmware development

- Existing PCBA sample analysis

- PCB layout and redesign

- Electronic component sourcing

- SMT assembly

- DIP assembly

- Wave soldering

- Functional testing

- IPQC and IPQA inspection

- Production traceability

- Prototype and volume manufacturing

The internal traceability process can cover raw materials, work-in-process products and finished PCB assemblies. Component selection and production planning can be adjusted according to the required functions, order quantity and destination-market standards.

More control board solutions are available on the [SUNSAM PCBA product page](https://www.sunsampcba.com/products.html).

Applications

The HS-SH-5534 control platform can support:

- Household instant electric water heaters

- Instant electric shower water heaters

- Compact bathroom water heaters

- Kitchen instant hot-water appliances

- Wall-mounted electric water heaters

- Wide-voltage export water heater projects

- OEM and ODM water-heating products

Customers can provide an existing PCBA sample, functional specification, product dimensions, heating-element information, wiring diagram and estimated order quantity. SUNSAM can evaluate the requirements and prepare a matching development and manufacturing proposal.

Frequently Asked Questions

Can the HS-SH-5534 support a 7 kW heating element?

Yes. The 7 kW heater configuration supports selectable power levels of 3, 4, 5, 6 and 7 kW. Final component ratings and thermal performance require confirmation according to the complete appliance.

Can the heating power be customized?

The current control platform supports heating elements rated from 3 to 7 kW. Other power requirements require evaluation based on the heating element, circuit structure, wiring, components and thermal design.

What is the available temperature range?

The adjustable temperature range is 30–55°C. Dedicated 38°C and 42°C keys provide quick access to commonly used settings.

Can the display panel and key layout be changed?

Yes. Display icons, key functions, panel materials and interface layouts can be customized according to the customer’s product design.

What information is required for a quotation?

An existing sample, detailed functional specification, PCBA dimensions, wiring diagram, sensor information, target power, safety requirements and estimated order quantity can support technical and cost evaluation.

Is sample validation required before mass production?

Yes. The PCBA must be matched with the heating element, flow sensor, temperature sensors, display panel, wiring and safety components of the complete appliance. Prototype validation should be completed before batch production.