Vaillant ecoTEC plus VU GB 806/5-5 80kW single-circuit condensing gas boiler

Vaillant ecoTEC plus VU GB 806/5-5 80kW is a wall-mounted single-circuit condensing gas boiler engineered for commercial buildings and large-scale heating systems. Utilizing advanced condensing technology, this Vaillant 80kW boiler recovers latent heat from flue gases to improve energy efficiency and reduce fuel consumption while delivering reliable heating performance.

The boiler features a 20–100% modulating burner that automatically adjusts output to match heating demand. Equipped with a stainless steel condensing heat exchanger, electronic combustion control, and an integrated eBus communication interface, it is suitable for new installations, indirect hot water cylinder integration, and cascade system configurations with up to 6 boilers, providing a total output of up to 720 kW.

Condensing Technology	Utilizes latent heat from flue gases to achieve high energy efficiency and reduced fuel consumption.
20–100% Modulating Burner	Automatically adjusts heating output according to the actual heat demand for efficient operation.
Cascade Configuration	Supports installation of up to 6 boilers in cascade with a total system output of up to 720 kW.
High Operating Pressure	Maximum operating pressure up to 6 bar, suitable for large heating systems and multi-storey buildings.
Stainless Steel Condensing Heat Exchanger	Provides high durability, corrosion resistance, and reliable long-term operation.
Electronic Combustion Control & eBus Communication	Ensures optimized combustion control and enables integration with Vaillant control systems.
Partial Load Adjustment	Allows boiler output configuration according to heating and hot water system requirements.
Low NOx Emissions	Provides environmentally friendly operation with reduced combustion emissions.
Built-in Safety Components	Includes electronic pressure sensor and automatic air vent for safe and reliable operation.

Rated Output	80 kW
Boiler Type	Wall-mounted condensing gas boiler
Installation Type	Wall-mounted
DHW Preparation	Via indirect hot water cylinder
Energy Efficiency Class	A
Efficiency (Hi)	Up to 109%
Recommended Heating Area	Up to 800 m²
Control Type	Buttons and control knobs / external automation options
Maximum Gas Consumption	8.0 m³/h
Heating Performance
Heat Output Range (at 60/40°C), kW	16–80
Heat Output (at 80/60°C), kW	14.9–74.1
Heat Exchanger Volume, l	17
Flue Gas Temperature (min/max), °C	40/85
Flue Gas Mass Flow Rate (min/max), g/s	6.9 / 34.4
Condensate Production (at 40/30°C, pH approx. 3.7), l/h	12.8
Maximum Flow Temperature, °C	85
Flow Temperature Adjustment Range, °C	30–85
Maximum Operating Pressure (Heating Circuit), bar	6
Nominal Heating Water Flow Rate, l/h	2990
Power Supply, V/Hz	230/50
Maximum Electrical Power Consumption, W	122
Connections
Flue / Air Duct Connection, mm	110/160
Gas Connection	Ø20 mm (R 1")
Heating Circuit Connection	G 1 1/4"
Dimensions and Weight
Dimensions (H × W × D), mm	960 × 480 × 602
Weight (empty), kg	68

Heating & DHW Preparation	Suitable for heating systems and domestic hot water production when combined with an indirect cylinder.
Low-Temperature Heating Systems	Compatible with radiator and underfloor heating systems.
New Construction & Renovation	Suitable for new buildings, renovated properties, residential and commercial applications.
Compact Boiler Rooms	Ideal for creating compact heating systems in limited spaces.
Flexible Combustion Air Supply	Allows combustion air intake from inside or outside the building.
Cascade System Installation	Supports wall-mounted cascade configurations with multiple boilers up to 720 kW total output.

Vaillant ecoTEC plus VU GB 806/5-5 80kW single-circuit condensing gas boiler

Features

Specifications

Installation & Application Options

Documentation