Vaillant ecoTEC pro VUW INT 236/5-3 18.5 kW
 | Outdated Product First of all, the model stands out for its efficiency — the average efficiency of the Vaillant ecoTEC pro VUW INT 236/5-3 gas boiler for the heated season is 107%. It was possible to achieve such a high figure thanks to the condensing technology, which provides additional energy from the condensation of water vapor. The useful power of the model is 23 kW, in other words, this unit can serve as a good solution for heating a room up to 184 m2. The model is double-circuit, that is, the user can also count on constant hot water in the tap. And for the summer period, you can completely turn off the heating as unnecessary, but simply use the boiler to prepare water. |
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First of all, the model stands out for its efficiency — the average efficiency of the Vaillant ecoTEC pro VUW INT 236/5-3 gas boiler for the heated season is 107%. It was possible to achieve such a high figure thanks to the condensing technology, which provides additional energy from the condensation of water vapor. The useful power of the model is 23 kW, in other words, this unit can serve as a good solution for heating a room up to 184 m2. The model is double-circuit, that is, the user can also count on constant hot water in the tap. And for the summer period, you can completely turn off the heating as unnecessary, but simply use the boiler to prepare water.
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Catalog Vaillant 2025 - new arrivals, bestsellers, and the most relevant models Vaillant.
Here again they started talking about the future rise in the price of natural gas, and once again I was glad that last year I replaced my old gas boiler with this model. After all, efficiency is by far one of the most important points for any household appliance. And in this parameter, this boiler is simply magnificent. First and foremost, I was attracted by the fact that Vaillant is a private German company and the most critical parts of this double-circuit condensing boiler's construction – the heat exchangers – are made not just anywhere, but in Germany. However, the main advantage of this model lies in something completely different. In addition to high power (up to 28 kW), it boasts outstanding efficiency. This is achieved through a more complex and well-thought-out design, which includes two stages of heat transfer. First, the water is heated by the hot combustion products of the gas, and then these same flue gases are cooled to the temperature at which the contained water vapor begins to condense, releasing even more heat. As a result, the actual savings compared to a conventional boiler are around 7-8%. I heat approximately 158 square meters, and the savings on such an area are quite significant. The boiler is equipped with a convenient digital control unit that can be integrated into a "smart home" system and has a forced draft for combustion products. It is necessary to divert the condensate, and up to 1.5-2 liters per hour is produced. The claimed efficiency of 107% is purely a marketing gimmick. Every schoolchild who has somewhat paid attention to their physics teacher knows that the efficiency cannot be 100%. What "marketeers" consider as 100% is the efficiency of a regular boiler. The real efficiency of condensing models does not exceed 96-97% in any case, and in household models, it's impossible. |
Products under the Vaillant brand have gained well-deserved popularity among heating equipment due to their high quality and reliability. Therefore, it is not surprising that the Vaillant ecoTEC pro VUW INT 236/5-3 condensing boiler is in demand among the most diverse audience.
Two contours
The model is suitable for installation in houses up to 184 m² — this is the figure that the efficient operation of the heating circuit is designed for. The primary heat exchanger is made of high quality stainless steel, and the heat carrier temperature range can vary from 30°C to 85°C. The hot water circuit has a lamellar design, and the material of its execution is food grade stainless steel. Water is heated in it to a temperature of 30-60°C.
Exploitation
The boiler is equipped with a closed combustion chamber with forced removal of flue gases through a coaxial chimney with a pipe diameter of 60/100 mm (included in the delivery). Combustion air intake can be carried out by the model both from the premises and from the street. The Vaillant ecoTEC pro VUW INT 236/5-3 uses natural or liquefied gas as an energy source.
Comfortable microclimate
Everyone will be able to understand the management of the boiler, which is facilitated by an intuitive menu interface and a clear display of information on the built-in backlit display. The screen also serves to display an error code in case of malfunctions or errors in the operation of the device. Although you don’t have to worry about the appearance of problems with the boiler, since a whole set of various security systems protects it from adverse factors. Under their vigilant control, the creation of a comfortable temperature regime in the dwelling and its uninterrupted maintenance on an ongoing basis is ensured, saving energy consumption.