Five double-circuit gas boilers of condensing type

The youngest model in the line of Bosch condensing boilers boasts advanced capabilities. Not only is she able to effectively cope with the heating of the dwelling with a total area of 180 m²., so in addition the boiler provides hot water preparation with a capacity of up to 10 liters/min.

The efficiency of the boiler at the lower limit of the norm of the coolant temperature (35 °C) tends to its maximum, thanks to which Bosch Condens 2000W ZWB 24-1 AR is well suited for ensuring the operation of underfloor heating. This mode is supported by the device in a separate order. The upper limit of the heating temperature of the coolant is limited to 82 °C.

The operating temperature range in the hot water supply circuit ranges from 40-60 °C. When the boiler is switched to summer mode, it starts working exclusively on heating water for the water supply system. Moreover, even a minimum water supply pressure is sufficient for the device.

The boiler equipment includes a closed combustion chamber, a stainless steel burner with pre-mixing, a recuperative heat exchanger, a built-in heating pump, a stepless modulated fan and a traction control device with an automatic shutdown system. Natural gas is used as fuel for the model, or it is possible to work on liquefied gas. The claimed service life of the gas burner is 25 years.

In the maximum performance mode, the model consumes less than 2.6 cubic metres of gas per hour. It is possible to control the heating intensity and the heating temperature of hot water both from the panel on the front side of the boiler body, and with the help of Bosch Open Therm room regulators, with which the device is compatible. Paired with a thermostat, a comfortable room temperature will be maintained by the boiler automatically according to a pre-set scenario.

The Czech company Protherm is part of the Vaillant Group — one of the world leaders in the heating systems market. The condensing boiler with the prefix "Lynx" provides effective heating of the dwelling with an area of up to 150 m² and is endowed with the function of hot water preparation.

The numbers 18/25 in the model index indicate the maximum heating and water heating capacity, respectively (measured in kW). From a senior colleague (Protherm Lynx Condens 25/30 MKV 26.5 kW Price from 43 900 up to 55 000 ₴) the power is slightly higher, which makes it suitable for houses with an area of over 200 m². The boiler heat exchanger is made of aluminium-silicon alloy, and the hot water circuit is made of stainless steel. The model is absolutely not demanding on the quality of gas and the hardness of water, and the absence of thin tubes in its design eliminates the clogging of ducts with small debris.

The boiler is able to maintain the maximum temperature of the coolant at 75 °C, and the hot water at 65 °C. Moreover, the "hot start" function allows you to get warm water just a couple of seconds after the start of water intake. The heating levels of water and coolant are set by means of a convenient control panel with an electronic display for displaying information. You can also rely entirely on automation — the built-in eBus bus allows you to integrate the boiler into a heating system with control elements based on Protherm thermoregulators.

The safety of the boiler operation is guaranteed by a variety of protective functions: the model is not afraid of freezing and overheating, and special sensors monitor the presence of flame and draft in the chimney. It is worth noting that the manufacturer scrupulously approaches the testing of its products at the production stage — Protherm Lynx Condens 18/25 MKV, like all its brethren, is tested at the factory for more than 300 parameters. So there is no need to worry about the reliability of the device — the satisfied reviews of the real owners of the model are a vivid confirmation of this.

Products under the Vaillant brand have found 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 public.

The model is suitable for installation in houses with an area of up to 184 m². — it is for this figure that the effective operation of the heating circuit is designed. The primary heat exchanger is made of high-quality stainless steel, and the temperature range of the coolant can range from 30 °C to 85 °C. The hot water supply circuit has a plate structure, and the material of its execution is food-grade stainless steel. The water is heated in it to a temperature of 30-60 °C.

The boiler is equipped with a closed combustion chamber with forced exhaust of flue gases through a coaxial chimney with a pipe diameter of 60/100 mm (included in the delivery package). Intake of gorenje air can be made by the model both from the room and from the street. Vaillant ecoTEC pro VUW INT 236/5-3 uses natural or liquefied gas as energy resources.

Everyone will be able to understand the management of the boiler, which is facilitated by the intuitive menu interface and clear display of information on the built-in backlit display. The screen also serves to display the error code in case of failures or errors in the operation of the device. Although you can not worry about the appearance of problems with the boiler, because 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 is ensured and its uninterrupted maintenance on a constant basis with savings in energy consumption.

The boiler from the Viessmann company was released at the dawn of 2016. It is assembled according to all the canons of the vaunted German quality with thoughtful access to all elements that require periodic maintenance. The components are located under the removable front panel, so the boiler does not need additional mounting space during installation.

The power range of the model is regulated in a wide range: from 4.7 kW to 26 kW. In the maximum power mode, the boiler is able to heat a room with a total area of more than 200 m², simultaneously providing the water supply system with hot water with a temperature from 30 to 57 °C. In addition, the model supports the "underfloor heating" mode, for which it is necessary to thank a powerful pump with automatic speed control. With its help, it is possible to achieve the circulation of a large amount of coolant through pipes laid under the floor.

The boiler operation parameters are controlled by means of a touch panel with backlight. A small screen displays data on the current temperature values for each circuit, the status of the burner and possible error codes (when they appear). To the left of the display, a place is allocated for the arrow pressure gauge. Optionally, it is possible to create a remote control system for the operation of the boiler directly from a smartphone.

All necessary protection systems are included in the equipment of the device: against gas pressure drop and flame extinction, freezing, overheating, violation of coolant circulation, etc. And the reliability of the boiler operation and the highest efficiency of its operation are ensured throughout the entire service life due to the use of high-quality stainless steel models as the material for manufacturing the heat exchanger.

The history of the Buderus brand dates back almost 300 years. Rich experience in the production of heating equipment and the constant introduction of new technologies allowed the German company to create a top—class product — Buderus Logamax Plus GB172i-20KD.

Behind the mirrored black glass, which covers the entire front panel of the device, it is not immediately possible to recognize the boiler. It looks more like a stylish locker, which is a spectacular element of the interior. By the way, the glass is not afraid of scratches and is easy to clean from dirt. The lower part of the mirror surface leans down, opening access to an intuitive control panel. Next to it, a place is allocated for the optional installation of the Logamatic RC300 controller, together with which the functionality of the boiler is significantly expanded.

The boiler is suitable for heating rooms with an area of about 160 m². and is equipped with a reliable aluminium alloy heat exchanger. The temperature range in the heating circuit can be changed from 35°C to 82 °C, and in the hot water system — from 40 °C to + 60 °C. When switching to summer mode, only the hot water cooking circuit remains functioning.

The model received a class "A" according to the European system for assessing the energy efficiency of equipment. In standby mode, the level of power consumed by it is only 2 watts, and at load — 60 watts. At the same time, the efficiency of the boiler is estimated by the highest efficiency (about 109%). From a momentary trip to the store for the device, only its high price tag holds it back. However, it is fully justified by the reliability of all elements of the model and its modern decoration.