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Comparison Vaillant turboTEC plus VUW 242/5-5 24.9 kW vs Vaillant turboTEC pro VUW 242/5-3 24.9 kW

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Vaillant turboTEC plus VUW 242/5-5 24.9 kW
Vaillant turboTEC pro VUW 242/5-3 24.9 kW
Vaillant turboTEC plus VUW 242/5-5 24.9 kWVaillant turboTEC pro VUW 242/5-3 24.9 kW
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Main
"Quick start" function. Electronic control panel with LCD display. Increased volume of the expansion tank.
DHW capacity at Δt=30° – 11.5 L/min. Protection against disturbance of water circulation. Possibility of connection to a solar collector and heat pump.
Energy sourcegasgas
Installationwallwall
Typedual-circuit (heating and DHW)dual-circuit (heating and DHW)
Heating area199 m²199 m²
Technical specs
Heat output24.9 kW24.9 kW
Min. heat output8 kW8 kW
Power supply230 V230 V
Power consumption142 W142 W
Coolant min. T30 °С30 °С
Coolant max. T80 °С80 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure10 bar10 bar
Consumer specs
DHW min. T35 °С35 °С
DHW max. T65 °С65 °С
"Summer" mode
Warm start
Circulation pump
Control buseBuseBus
Boiler specs
Efficiency93 %93 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter60/100 mm60/100 mm
Inlet gas pressure13 mbar
Max. gas consumption2.8 m³/h2.8 m³/h
Expansion vessel capacity10 L6 L
Expansion vessel pressure1 bar
Coolant performance1032 L/h
Heat exchangercopper
Connections
Mains water intake3/4"3/4"
DHW flow3/4"3/4"
Gas supply1/2"1/2"
Central heating flow3/4"3/4"
Central heating return3/4"3/4"
Safety
Safety systems
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
More specs
Dimensions (HxWxD)800x440x338 mm800x400x338 mm
Weight41 kg40 kg
Added to E-Catalogoctober 2017november 2016

Inlet gas pressure

It is the optimum gas pressure supplied to the inlet of the boiler system. Most often indicated for natural gas and is about 15-20 mbar. This parameter must match the specs of the gas supply system. However, the pressure in the latter may be higher, which may require the installation of a special gas regulator.

Expansion vessel capacity

The capacity of the expansion tank supplied with the boiler.

The expansion tank is designed to drain excess water from the heating system when the total volume of liquid increases as a result of heating. It consists of two parts connected by a flexible membrane: in one, hermetically closed, there is air under pressure; in the other, excess water enters, compressing the membrane. In this way, a catastrophic increase in pressure in the heating circuit is avoided. The optimal volume of the expansion tank depends on several system parameters, primarily the volume and composition of the coolant; detailed recommendations for calculations can be found in special sources.

Expansion vessel pressure

It is a pressure in the hermetically sealed part of the expansion vessel (for details on the design, see Expansion vessel capacity). The required pressure in the expansion vessel must be approximately 0.3 bar higher than the initial pressure in the system. The initial pressure, in turn, directly depends on the total height of the heating system or, rather on the difference between the height of the highest and lowest points of the heating system. It can be derived using the approximate formula P=H/10, where P is the initial pressure in the bar, and H is the height difference between the highest and lowest point of the system in metres. Thus, if the height difference is 2 m, the initial pressure in the system is 0.2 bar, and the pressure in the expansion tank must be at least 0.5 bar.

Coolant performance

The amount of heat carrier passing through the boiler heat exchanger per unit of time. The optimal performance is such that three full volumes of the entire heating system pass through the heat exchanger per hour.

Heat exchanger

The material of the primary heat exchanger, in which thermal energy from hot combustion products is transferred to the heat medium. The efficiency of the boiler, the heating rate and the service life of the unit directly depend on the material of the heat exchanger.

Copper. Copper is a material with the best heat dissipation specs and high corrosion resistance. It heats up quickly, which allows you to save energy during the operation of the heating boiler, has a low roughness coefficient, and has a long service life. The only drawback of this metal is its high cost. Copper heat exchangers are installed in heavy mid-range and premium grade equipment.

Aluminium. Aluminium as a heat exchanger material is characterized by excellent thermal conductivity and long service life. Moreover, it is cheaper than copper. To reduce the cost of production in copper heat exchangers, they try to reduce the wall thickness. You don't need to do this with aluminium.

Cast iron. Boilers with a cast-iron heat exchanger heat up for a long time and cool down slowly, retaining heat for a long time after heating stops. Cast iron is also notable for its high heat capacity and low susceptibility to corrosion. The service life of a cast iron unit can be 30 or 50 years. The reverse side of the coin is the huge weight and size of hea...ting equipment, which is why boilers with cast-iron heat exchangers are produced mainly in floor-standing boilers. In addition, cast iron does not tolerate sudden temperature changes — they can cause cracks.

Steel. Steel heat exchangers in heating boilers are the most widely used. Steel has a combination of high ductility and strength when exposed to high temperatures, is inexpensive, and can be easily processed at production stages. However, steel heat exchangers are susceptible to corrosion. As a result, they are not as durable.

Stainless steel. Stainless steel heat exchangers are rare in heating boilers, which is explained by the high cost of using this material. But they combine the advantages of both cast iron and steel. Stainless steel exhibits high corrosion resistance, resistance to thermal shocks, low inertia, and long service life.
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