1. Introduction and Safety Information
This manual provides essential information for the safe installation, operation, and maintenance of your Eldom WH05039R horizontal electric water heater. Please read these instructions carefully before installation and use, and keep them for future reference. Incorrect installation or operation can lead to property damage, injury, or death.
Important Safety Warnings:
- Professional Installation: Installation and initial startup must be performed by a qualified and certified technician in accordance with local regulations and this manual.
- Electrical Safety: Ensure the power supply matches the specifications of the water heater (230V, 3000W). The appliance must be properly grounded. Do not operate with damaged cables or plugs.
- Water Pressure: The maximum operating pressure is 0.7 MPa (7 bar). A pressure relief valve must be installed.
- Temperature: Hot water can cause severe burns. Exercise caution when using hot water.
- Children and Vulnerable Persons: This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction.
- Frost Protection: Do not install the water heater in areas where temperatures can drop below 0°C (32°F) unless adequate frost protection measures are in place.
2. Product Overview
The Eldom WH05039R is a horizontal electric water heater designed for efficient hot water supply in spaces where vertical installation is not feasible. It features advanced insulation and protection systems to ensure durability and energy efficiency.
Key Features:
- Horizontal Installation: Specifically designed for horizontal mounting.
- Capacity: 50 liters.
- Energy Efficiency: Thick, dense CFC-free insulation minimizes heat loss. ErP compliant.
- Corrosion Protection: Boiler coating for high temperature resistance and two magnesium anode systems protect against rust.
- Safety: Includes a 3-in-1 metal safety valve and 6-level protection.
- Control: External mechanical thermostat, illuminated and waterproof on/off switch, and temperature display.
- ECO Function: For optimized energy consumption.

Figure 2.1: Front view of the Eldom WH05039R Horizontal Water Heater, showing its compact design suitable for horizontal mounting.

Figure 2.2: Diagram illustrating key features of the Eldom WH05039R, including ErP compliance, 6-level protection, two anodes, ECO function, and frost protection.
3. Technical Specifications
Below are the detailed technical specifications for the Eldom WH05039R water heater.
| Specification | Value |
|---|---|
| Model Number | WH05039R |
| Capacity | 50 Liters |
| Installation Method | Horizontal, Wall-mounted |
| Connections | Right-sided |
| Voltage | 230 V~ |
| Power | 3000 W (3 kW) |
| Rated Pressure | 0.7 MPa (7 Bar) |
| Dimensions (L x D) | 76 cm x 41 cm |
| Gross Weight | 27 kg |
| Material | Alloy Steel |
| Energy Consumption | 1418 kWh/year (Energy Label C) |
| Mixed Water at 40°C | 70 Liters |
| Special Features | Remote control (functionality not detailed in product info), Horizontal mounting |

Figure 3.1: Technical label of the Eldom WH05039R, showing voltage, power, rated pressure, serial number (1510093137), gross weight, and handling symbols. The barcode 3800035717891 is also visible.
4. Installation
The installation of the Eldom WH05039R water heater requires adherence to local plumbing and electrical codes. It is strongly recommended that installation be carried out by a certified professional.
4.1 Mounting the Water Heater
- Select a suitable wall location capable of supporting the full weight of the water heater when filled (approx. 77 kg for 50L + 27 kg unit weight).
- Ensure adequate clearance around the unit for maintenance and air circulation.
- Mount the water heater horizontally using appropriate wall anchors and brackets (not included, or refer to specific mounting kit instructions).
4.2 Plumbing Connections
- Connect the cold water inlet (usually marked blue) to the main cold water supply.
- Connect the hot water outlet (usually marked red) to the household hot water distribution system.
- Install the supplied 3-in-1 metal safety valve on the cold water inlet. Ensure the discharge pipe from the safety valve is directed downwards and terminates in a visible location, free from obstruction, to prevent water damage in case of discharge.
- Flush the system thoroughly to remove any debris before connecting the water heater.
- Fill the water heater with water before switching on the power. Open a hot water tap to allow air to escape until water flows steadily.
4.3 Electrical Connection
- Ensure the main power supply is switched off at the circuit breaker before making any electrical connections.
- Connect the water heater to a dedicated 230V, 10A circuit. The appliance has a connected load of 3000W.
- Ensure proper grounding according to local electrical codes.
- The illuminated and waterproof on/off switch is integrated into the unit.
5. Operating Instructions
Once installed and filled with water, your Eldom WH05039R water heater is ready for operation.
5.1 Initial Startup
- Ensure the water heater is completely filled with water (as described in Section 4.2).
- Switch on the main power supply to the water heater at the circuit breaker.
- Press the illuminated on/off switch on the unit. The light will indicate that the unit is powered.
5.2 Temperature Adjustment
- Use the external mechanical thermostat knob to set your desired water temperature.
- The temperature display will show the current water temperature inside the tank.
- For energy saving, avoid setting the temperature higher than necessary.
5.3 ECO Function
- If your model features an ECO function, activate it for optimized energy consumption. This function typically adjusts heating cycles to reduce energy usage while maintaining sufficient hot water. Refer to the specific controls on your unit for activation.
6. Maintenance
Regular maintenance ensures the longevity and efficient operation of your Eldom WH05039R water heater. Always disconnect the power supply before performing any maintenance.
6.1 Anode Rod Inspection and Replacement
- The water heater is equipped with two magnesium anode systems to protect against corrosion.
- Anode rods should be inspected annually by a qualified technician and replaced as needed, typically every 1-3 years depending on water quality.
6.2 Safety Valve Check
- Manually operate the pressure relief valve lever at least once a year to ensure it is not blocked. Water should discharge from the drain pipe. If no water discharges, the valve may be faulty and requires replacement.
6.3 Draining the Water Heater
- To drain the water heater for maintenance or if there is a risk of freezing:
- Switch off the power supply to the unit.
- Close the cold water inlet valve.
- Open a hot water tap in your home to allow air into the system.
- Open the drain valve (if present) or disconnect the cold water inlet pipe at the safety valve to allow water to drain.
6.4 Cleaning
- Clean the exterior of the water heater with a soft, damp cloth. Do not use abrasive cleaners or solvents.
7. Troubleshooting
Before contacting customer support, please check the following common issues and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No hot water | No power supply; Thermostat set too low; Heating element failure. | Check circuit breaker and on/off switch; Adjust thermostat; Contact a qualified technician. |
| Insufficient hot water | Thermostat set too low; High hot water demand; Sediment buildup. | Increase thermostat setting; Allow more recovery time; Schedule descaling by a technician. |
| Water leaking from safety valve | Normal expansion during heating; Faulty safety valve; Excessive water pressure. | This is normal during heating. If continuous, check water pressure or replace valve. |
| Water leaking from unit | Loose connections; Tank corrosion. | Tighten connections; If tank corrosion, unit may need replacement. Contact technician. |
| Strange noises from unit | Sediment buildup in tank. | Schedule descaling by a qualified technician. |
8. Warranty and Support
Eldom products are manufactured to high-quality standards. For warranty information, please refer to the warranty card included with your product or contact your retailer. Keep your purchase receipt as proof of purchase.
For technical support, spare parts, or service, please contact your authorized Eldom dealer or a qualified service technician. Do not attempt to repair the appliance yourself, as this may void the warranty and pose safety risks.
This product is CE certified, indicating compliance with European health, safety, and environmental protection standards.