SKU: 0010024668

Vaillant ecoTEC plus VUW 26 CS /1-5 dual-circuit condensing gas boiler

The Vaillant ecoTEC plus VUW 26 CS/1-5 is a 26 kW wall-mounted condensing combi gas boiler designed for residential heating and domestic hot water production. The model features intuitive touch controls, a built-in plate heat exchanger, and advanced condensing technology providing efficiency of up to 109%. The boiler supports 60/100 mm and 80/125 mm flue systems, meets NOx Class 6 environmental standards, and is compatible with modern Vaillant control systems, ensuring high comfort, energy efficiency, and reliable long-term operation.

Parameter	Value
Nominal output	26 kW
Energy efficiency class (heating)	A
Energy efficiency class (domestic hot water)	A
Heat output (50/30°C mode)	2.7 – 21.0 kW
Heat output (80/60°C mode)	2.4 – 19.7 kW
Heat output in DHW mode	24.5 kW
Domestic hot water flow rate (ΔT=30°C)	12.4 l/min
Minimum water flow rate	2.0 l/min
Maximum flow temperature	85°C
Maximum DHW temperature	65°C
Maximum operating pressure (heating circuit)	3 bar
Maximum operating pressure (water circuit)	10 bar
Nominal heating water flow rate	846 l/h
Residual head of circulation pump	250 mbar
Condensate production (50/30°C)	2.6 l/h
Condensate drain pipe	19 mm
Flue gas temperature (min/max)	35 / 85°C
Flue gas mass flow rate (min/max)	2.4 / 12.8 g/s
NOx class	6
Power supply	230 V / 50 Hz
Maximum electrical consumption	103 W
Connections
Connection	Value
Flue / air duct	60/100 mm
Gas connection	Ø15 mm (G 3/4" adapter included)
Heating flow connection	G 3/4"
Heating return connection	G 3/4"
Domestic hot water connection	G 3/4"
Cold water connection	G 3/4" (shut-off valve included)
Dimensions and Weight
Parameter	Value
Dimensions (H × W × D)	720 × 440 × 348 mm
Weight	36 kg

Condensing Technology	Provides high efficiency, reduced gas consumption, and low emissions
IoniDetect Combustion Control System	Automatically adapts combustion according to gas quality for stable and efficient operation
1:10 Modulation Range	Enables precise output regulation and maximum energy savings
High-Efficiency Pump	Ensures optimized heating system performance with reduced electrical consumption
eBUS and LIN-bus Communication	Provides advanced settings, diagnostics, and system control
Touch Screen with LED Backlight	Offers simple, intuitive, and convenient operation
Built-in Domestic Hot Water (DHW) System	Provides rapid hot water delivery and stable temperature maintenance
Hot Start and aquaPOWER plus Functions	Ensures maximum comfort and performance during hot water usage
Auto-fill and Pressure Monitoring	Simplifies maintenance and ensures safe operation
Weather-Compensated Control	Automatically adjusts heating operation for improved efficiency
Remote Control via Internet	Compatible with sensoNET internet module for remote control and diagnostics
Low Noise and Compact Design	Enables convenient installation in residential areas
Stainless Steel Heat Exchanger	Provides high reliability and extended service life
Made in Germany	Manufactured according to Vaillant’s high quality standards

Water pressure sensor	Monitors the heating system pressure
10-liter expansion tank	Compensates pressure changes in the heating system
Pump and valve anti-blocking protection	Prevents the circulation pump and priority valve from seizing during long idle periods

Vaillant ecoTEC plus VUW 26 CS /1-5 dual-circuit condensing gas boiler

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