Vaillant ecoTEC plus condensing combi boiler

ecoTEC plus is Vaillant’s premium full condensing combi range, offered in five heating outputs between 20 kW and 35 kW. It suits large flats, duplexes and two-bathroom homes where hot water comfort must not drop.

Capacity: 20–35 kW
Energy class: A

The IoniDetect combustion control adjusts the gas-air mixture by itself when the quality of the mains gas changes, so efficiency stays stable through the season. A 1:10 modulation ratio lets the boiler throttle down instead of cycling on and off on mild days.

Paired with a compatible room control and an outdoor sensor, the system can reach an A+ seasonal efficiency class. In Antalya, where boilers run long hours in winter, that difference shows up directly on the gas bill.

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Technical data

Figures come from the manufacturer’s official product page and technical documents; they can vary by model and output.

Vaillant ecoTEC plus – technical data table
Property	Detail
Capacity	20–35 kW
Heating output	20–35 kW
Hot water output	26–40 kW
Hot water flow rate	19.1 L/min
Modulation ratio	1:10
Seasonal heating efficiency	ηs 94% (class A)
Hot water load profile	XL
Water heating efficiency	84–85%
Annual energy consumption	9,634–16,666 kWh/year
NOx emissions	25–31 mg/kWh (NOx class 6)
Sound power level	45–50 dB(A), indoor
Dimensions (H × W × D)	720 × 440 × 348 mm
Weight	36–37 kg (VUW 26/32 CS, dry)
Operating pressure	Heating max 3 bar · DHW 0.3–10 bar
Max. flow temperature	85 °C
Flue diameter	60/100 mm
Electrical supply	230 V / 50 Hz
Electrical consumption	Heating 60–95 W · DHW 95–125 W · standby <2 W
Protection class	IP X5D
Energy class	A

Source: Vaillant official product page, product information sheet (ErP) and installation/maintenance manuals. Values with a stated measuring condition apply under the test conditions of that standard.

What Devka Doğalgaz does for this product

We do not just sell the appliance; our own team handles every step from selection to the annual service.

Choosing the right output

We size the appliance to your floor area, household size and hot water demand during a free survey.
Sale and installation

We invoice the appliance as an authorised dealer and carry out the pipework and flue to standard.
Commissioning

We do the first start-up, register the warranty and show you how to use the appliance on site.
Authorised service

We remind you when the annual service is due and give priority appointments across Antalya.

Vaillant ecoTEC plus VUI combi boiler with built-in cylinder
- 36 / 40 kW
An ecoTEC plus with a hot water cylinder inside the casing, so no separate cylinder is needed. It delivers up to 220 litres of hot water in ten minutes, which suits flats with two bathrooms and heavy use. The stainless steel heat exchanger gives a long service life.
Vaillant ecoTEC pro condensing combi boiler
- 20–35 kW
A condensing combi range built around a balance of price and performance. Aqua Comfort and Aqua Sensor technology keep the hot water temperature stable even at flow rates as low as 1.5 L/min. Automatic output matching lets the appliance follow the actual heat demand of the home.
Vaillant ecoTEC pure condensing combi boiler
- 20–35 kW
A condensing combi with A rated efficiency in both heating and hot water, delivering XL profile hot water performance. Aqua Sensor technology maintains comfort even at low flow rates. A well balanced choice for standard flats.