Combined electric water heater BiLight KOMBI BI 100PK

Product detailed description

The BiLight KOMBI BI 100PK is typically used in residential and commercial buildings where a compact yet high-performance domestic hot water solution is required alongside space heating. This unit is commonly found in installations where central heating systems need to supply both space heating and domestic hot water. Installers working on mixed systems benefit from the unit’s vertical design, which allows wall mounting and efficient use of floor space. The system is suitable for secondary circuits in heating systems, where the heat exchanger draws thermal energy from the primary circuit.

Designed for use in mixed systems, the BiLight KOMBI BI 100PK supports both storage and instantaneous hot water supply. The tubular heat exchanger ensures fast recovery times and high flow rates, making it ideal for applications with multiple simultaneous hot water demands. The patented TURBOLATOR and PISTON EFFECT technologies enhance performance by improving heat transfer and reducing thermal mixing, respectively. These features are particularly beneficial in installations where rapid response and consistent output are critical.

Technical parameters

Actual volume	96 L
Power	2000 W
Heat exchanger volume	3.2 L
Heat exchanger surface area	0.7 m²
Heat exchanger power	18.5 kW
Constant hot water flow rate at dT 35°C (60-80°C) S1	433 L/h
Energy efficiency class ERP	C
Voltage	230 V
Current	16 A
Height	985 mm
Diameter	440 mm
Depth with bracket	467 mm
Warranty	5 years
Electrical protection	24 IP
Net weight	37.2 kg
Heater design	Round
Mounting type	Wall-mounted vertical
Heating time of heat exchanger ∆t=45°C (15-60°C)	0:18 h:min
EAN	3800879120703
Code	303304
Brand	TESY

The nominal capacity of 96 L provides sufficient volume for average household usage. The heat exchanger’s 3.2 L internal volume and 0.7 m² surface area contribute to its ability to handle high flow rates—up to 433 L/h under standard conditions (ΔT 35°C). The 18.5 kW heat exchanger power indicates its suitability for integration with medium-sized boilers. The 2000 W electrical element offers auxiliary heating when needed, ensuring continuous hot water supply during boiler downtime. These parameters should guide the sizing of the system and the selection of compatible components such as circulation pumps and expansion vessels.

Installation and connection

Mounting of the BiLight KOMBI BI 100PK requires a secure vertical wall mount using the provided bracket. The unit has a height of 985 mm and a diameter of 440 mm, making it suitable for wall spaces with minimal clearance. The inlet and outlet connections are threaded and must be checked for correct orientation before installation. A 16 A electrical supply at 230 V is required for the electric element. It is essential to verify that the central heating system can provide adequate flow through the heat exchanger and that the return circuit is correctly sized to avoid thermal stratification.

Common installation mistakes include incorrect orientation of the heat exchanger inlet (which must connect to the central heating supply), failure to insulate exposed pipes, and neglecting to bleed air from the system after installation. A balanced flow rate through the heat exchanger is crucial for maintaining optimal performance. To ensure reliable operation, the system should be equipped with a circulation pump and a differential pressure switch to manage flow stability.

Compatibility and accessories

This unit is designed to work with central heating systems and requires a properly sized boiler capable of delivering a minimum flow rate of 433 L/h. Accessories such as a circulation pump, expansion vessel, and pressure relief valve should be included in the overall system design. For larger installations, additional storage tanks or buffer vessels may be necessary to maintain system balance. As no alternative models are listed, installers should refer to the manufacturer’s documentation for specific pairing recommendations.

Technical background for designers

The BiLight KOMBI BI 100PK operates by transferring heat from the central heating system to the stored water via a tubular heat exchanger. The TURBOLATOR technology enhances turbulence within the heat exchanger, increasing the rate of heat transfer and reducing fouling buildup. The PISTON EFFECT system prevents cold water from mixing with the stored hot water by creating a piston-like flow pattern when cold water enters the tank. This improves the usable hot water yield and reduces thermal losses.

Constructed with durable materials, the tank is insulated to minimize standby heat loss. The heat exchanger is made of materials selected for resistance to corrosion and scaling. Integration into the system requires careful consideration of flow dynamics and temperature gradients to maximize efficiency and extend component lifespan. The IP24 rating ensures protection against splashing water, making it suitable for dry mechanical rooms and utility areas.

Service and operation

No specific service intervals are mentioned in the brief, but periodic inspection of the heat exchanger for scaling and the electrical element for faults is recommended. The unit should be drained periodically to remove sediment, especially in areas with hard water. Key operational checkpoints include verifying the correct temperature of the stored water, checking for leaks at all connections, and monitoring the electrical supply for stability. The unit’s 5-year warranty covers manufacturing defects but does not include routine maintenance or damage due to improper installation.

Frequently asked questions

Can the BiLight KOMBI BI 100PK be connected to a condensing boiler?
Yes, the unit is compatible with condensing boilers provided the boiler can deliver the required flow rate and the system includes a circulation pump to maintain stable flow through the heat exchanger.

Is the electrical element thermostatically controlled?
Yes, the 2000 W electrical element activates automatically when the stored water temperature drops below the set point, providing backup heating during periods when the central heating system is not active.

What is the maximum flow rate achievable with this unit?
The unit delivers up to 433 L/h of hot water at a ΔT of 35°C, making it suitable for installations with multiple outlets such as showers and taps operating simultaneously.

Does the unit require a separate expansion vessel?
Yes, an expansion vessel should be installed in the system to accommodate thermal expansion from both the central heating circuit and the domestic hot water circuit, ensuring pressure stability and preventing overpressure situations.

Documents for download

• Dokument na stiahnutie (PDF)
• Dokument na stiahnutie (PDF)
• Dokument na stiahnutie (PDF)
• Dokument na stiahnutie (PDF)
• Dokument na stiahnutie (PDF)