Combined electric water heater BiLight KOMBI BI 150PK

Product detailed description

This combined water heater is designed for use in residential and commercial buildings where a compact solution for domestic hot water and space heating integration is required. The unit is typically installed in mechanical rooms, boiler houses or utility areas where central heating systems are located. The vertical orientation allows for efficient use of floor space while maintaining accessibility for maintenance and inspection. The system integrates with standard central heating circuits via the right-side connection point, enabling simultaneous heating of the building and domestic water storage. The patented TURBOLATOR system increases heat transfer efficiency by up to 26% through enhanced turbulence in the heat exchanger, while the PISTON EFFECT inlet minimises cold water mixing, improving hot water yield by up to 16%.

The unit is suitable for applications requiring high flow rates of hot water, such as hotels, care homes or large households. The compact design allows for flexible installation in tight spaces, while the stainless steel tank and copper heat exchanger ensure long-term durability and resistance to corrosion. The device operates on a 230V supply with a 16A circuit breaker and requires a dedicated electrical connection with IP24 protection rating. The 138L storage volume provides sufficient capacity for multiple users while the rapid heat-up time of 26 minutes ensures quick recovery during high demand periods.

Technical parameters

The 138L actual volume indicates the usable water capacity for storage, while the 3.2L upper heat exchanger volume reflects the internal working volume for heat transfer. The 0.7 m² surface area of the heat exchanger contributes to the 18.5 kW thermal output, which is significantly higher than standard models. The 433 L/h flow rate at 35°C temperature rise demonstrates the unit's ability to deliver continuous hot water under normal conditions. The 2000 W electric element provides backup heating when the heat exchanger alone cannot meet demand. These parameters are essential for proper system sizing and integration with existing central heating infrastructure.

Installation and connection

Mounting should be performed using the provided wall brackets, ensuring the unit is securely fastened to load-bearing structures. The vertical orientation requires careful alignment to prevent stress on connections. The central heating connection is located on the right side of the unit and uses standard pipe threads for integration with radiators or underfloor heating systems. Cold and hot water connections are located at the bottom, with separate inlets for mains water and return from the heat exchanger. All connections must be sealed with appropriate thread sealant or PTFE tape to prevent leaks.

• Verify electrical supply meets 230V, 16A requirements with IP24-rated enclosure
• Use copper or stainless steel piping for central heating connections
• Install expansion vessel in central heating circuit to accommodate thermal expansion
• Ensure adequate ventilation around the unit for heat dissipation
• Check that all electrical connections are isolated before installation

Common installation errors include incorrect orientation of the unit, failure to provide proper support for the wall mount, and improper sealing of pipe connections. The unit must be installed vertically with the specified clearance for air circulation. Incorrect electrical wiring can lead to overheating or failure of the heating element. Always follow the manufacturer's instructions for specific mounting requirements and connection details.

Compatibility and accessories

The BiLight KOMBI BI 150PK is compatible with standard central heating systems using copper or stainless steel piping. For optimal performance, it should be connected to a boiler or heat pump capable of delivering consistent thermal output. Additional components required for full operation include a central heating pump, expansion vessel and safety valve. The unit is not compatible with solar heating systems without additional controls. The round design allows for integration with standard wall mounting systems, but custom brackets may be required for non-standard installations. No alternative products are available for direct comparison with this model.

Technical background for designers

The unit operates on a dual-mode principle: the heat exchanger transfers thermal energy from the central heating circuit to the stored water, while the electric element provides supplementary heating. The tubular heat exchanger is constructed from copper with a surface area of 0.7 m², optimised for rapid heat transfer. The patented TURBOLATOR system creates controlled turbulence within the heat exchanger tubes, increasing the rate of heat exchange by up to 26% compared to conventional designs. The PISTON EFFECT inlet system uses a specially designed baffle plate to direct incoming cold water along the tank wall, minimising mixing with already heated water and increasing usable hot water output by up to 16%.

The stainless steel tank is insulated to reduce heat loss and maintain storage temperature. The 138L volume is sufficient for multiple users but requires careful consideration of peak demand periods. The unit is designed for integration with standard central heating systems, with the right-side connection allowing for direct coupling with radiators or underfloor heating circuits. The 2000 W electric element provides backup heating when the heat exchanger alone cannot meet demand, ensuring continuous hot water supply even during low system output periods. The IP24-rated electrical enclosure protects against dust and splashing water, making the unit suitable for installation in utility areas with normal environmental conditions.

Service and operation

Regular maintenance includes checking the integrity of all pipe connections and electrical wiring, particularly after periods of inactivity. The heat exchanger should be inspected for signs of scale buildup, which can reduce efficiency over time. The electric element should be tested periodically for continuity and insulation resistance. The unit does not require scheduled service intervals beyond these basic checks. During operation, ensure that the central heating system maintains a minimum flow rate through the heat exchanger to prevent overheating. Monitor the tank temperature regularly to ensure it remains within the recommended range for domestic hot water use.

• Check electrical connections annually for wear or corrosion
• Inspect heat exchanger for scale buildup during annual service
• Verify tank insulation remains intact and free from damage
• Test electric element resistance with a multimeter during maintenance
• Ensure central heating pump maintains minimum flow rate through heat exchanger

Abnormal operation may be indicated by reduced hot water output, unusual noises from the tank, or increased energy consumption. In such cases, disconnect the unit from power and inspect all components for faults. The 5-year warranty covers defects in materials and workmanship but excludes damage caused by improper installation or maintenance. Always refer to the technical documentation for specific service procedures and diagnostic tests.

Frequently asked questions

Can the BiLight KOMBI BI 150PK be connected to a condensing boiler?
Yes, the unit is compatible with condensing boilers provided the boiler can maintain the required flow rate through the heat exchanger. Ensure the boiler is sized appropriately for the heat exchanger's 18.5 kW thermal output.

Is the electric element thermostatically controlled?
The electric element is activated automatically when the tank temperature falls below the set threshold. The control system ensures the element only operates when necessary to maintain the desired storage temperature.

Can the unit be installed in a basement?
Yes, provided the installation location has adequate ventilation and is free from flooding risk. The IP24-rated electrical enclosure allows for installation in areas with normal environmental conditions but not in continuously damp locations.

How is the unit drained for maintenance?
A drain valve is located at the bottom of the tank for complete draining. Open the valve and allow water to drain fully before disconnecting any pipe connections. Ensure the area is prepared for water collection during the draining process.

Documents for download

• Technical specification sheet (PDF)
• Installation instructions (PDF)
• Warranty information (PDF)
• Maintenance guide (PDF)