Combined electric water heater BiLight KOMBI BI 150LK

Product detailed description

This combined electric water heater is suitable for residential and commercial buildings where central heating and domestic hot water systems need to operate from a single unit. Installers working on multi-room heating layouts or compact boiler rooms will find this model particularly useful due to its vertical orientation and compact footprint. The system integrates a central heating circuit with a dedicated DHW supply, reducing the need for separate appliances. The design supports left-side system connections for central heating integration and is intended for wall mounting in permanent indoor environments.

The BiLight KOMBI BI 150LK is suited for use in radiant floor heating systems, panel radiators, and underfloor heating applications. The unit's thermal performance allows it to handle continuous DHW demand, making it ideal for households with multiple occupants or small hotels. The system operates using a combination of electric heating and heat transfer via a tubular heat exchanger, ensuring rapid response to load changes and stable output temperatures.

Technical parameters

Actual volume	138 L
Power	2000 W
Heat exchanger volume	3.2 L
Heat exchanger surface area	0.7 m²
Heat exchanger power	18.5 kW
Constant DHW flow rate at ΔT 35°C (60-80°C) S1	433 L/h
Energy efficiency class ERP	C
Voltage	230 V
Current	16 A
Height	1315 mm
Diameter	440 mm
Depth with bracket	467 mm
Warranty	5 years
Electrical protection rating	24 IP
Net weight	43.3 kg
Heater design	Round
Mounting type	Wall-mounted vertical
Heating time of exchanger Δt=45°C (15-60°C)	0:26 h:min
EAN	3800879118847
Code	302762
Brand	TESY

The actual volume of 138L provides sufficient storage for domestic hot water while maintaining space efficiency. The 18.5kW thermal power of the heat exchanger ensures fast heating of incoming cold water, while the 2000W electric element offers supplementary heating when required. The 433L/h flow rate at a temperature difference of 35°C indicates the unit’s ability to meet continuous DHW demand during peak usage periods. These parameters are essential for determining system sizing and compatibility with existing central heating infrastructure.

Installation and connection

Mounting should be carried out on a solid, level surface or wall, with the unit suspended vertically using the provided brackets. The installation requires a minimum clearance around the unit for ventilation and access. The left-side system connection for central heating must be aligned with the corresponding piping layout. Connection sizes are typically DN15 for inlet/outlet ports, with male/female threads depending on the fitting type. Installers must ensure that the electrical supply is correctly wired to the 230V, 16A circuit with appropriate overcurrent protection. Common installation errors include incorrect bracket positioning, failure to secure the unit firmly, and improper sealing of pipe connections, which can lead to leaks or reduced efficiency.

Compatibility and accessories

This unit is compatible with standard central heating systems and can be integrated with thermostatic controls and circulation pumps for enhanced performance. Accessories such as expansion vessels, safety valves, and pressure-reducing valves may be required for full system compliance. Installers should also consider additional components like isolation valves and temperature sensors for monitoring and control purposes. The unit is not listed as having direct alternative or related products available for cross-reference.

Technical background for designers

The BiLight KOMBI BI 150LK operates by transferring heat from the central heating system to the stored water through a tubular heat exchanger. This method allows for simultaneous space heating and DHW production without requiring additional energy sources. The heat exchanger is constructed from durable materials designed to withstand high thermal loads and prevent corrosion. The patented TURBOLATOR system increases turbulence within the heat exchanger, improving heat transfer efficiency by up to 26%. The PISTON EFFECT system minimizes cold water mixing, ensuring consistent DHW temperatures and increasing output by up to 16%. Integration into the system depends on the layout of the central heating loop and the availability of return flow to maintain the heat exchanger’s effectiveness. Long-term efficiency is influenced by the quality of insulation, the condition of the heat exchanger, and the accuracy of temperature regulation.

Service and operation

Routine maintenance includes checking the integrity of pipe connections, verifying the functionality of the electric heating element, and inspecting the heat exchanger for signs of scaling or blockage. The unit does not specify a defined service interval, but periodic inspections are recommended to ensure optimal performance. Key checkpoints during operation include monitoring the temperature of the DHW supply, verifying the correct flow rate, and ensuring that the unit remains securely mounted. Any unusual noise or fluctuations in output temperature should prompt further investigation.

Frequently asked questions

Can the BiLight KOMBI BI 150LK be integrated into a low-pressure central heating system?
Yes, the unit is designed for standard central heating systems and can be adapted to low-pressure configurations with appropriate fittings and controls.

Is the heat exchanger removable for cleaning or replacement?
The heat exchanger is a sealed unit and is not designed for disassembly. Any maintenance or replacement must be performed by a qualified technician.

How does the PISTON EFFECT system improve DHW output?
The PISTON EFFECT prevents cold water from mixing with stored hot water by creating a piston-like flow pattern inside the tank, thereby increasing the available volume of hot water by up to 16%.

What is the impact of the TURBOLATOR system on thermal efficiency?
The TURBOLATOR increases turbulence in the heat exchanger, enhancing heat transfer efficiency by up to 26%, which reduces the time required to heat incoming water and improves overall system performance.

Documents for download

• Installation manual (PDF)
• Technical specification sheet (PDF)
• Maintenance guide (PDF)
• Safety and operation instructions (PDF)