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Comparison Vaillant ecoTEC plus VU INT 246/5-5 20 kW vs BAXI Duo-tec Compact 1.24 24.7 kW
230 V

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Vaillant ecoTEC plus VU INT 246/5-5 20 kW
BAXI Duo-tec Compact 1.24 24.7 kW 230 V
Vaillant ecoTEC plus VU INT 246/5-5 20 kWBAXI Duo-tec Compact 1.24 24.7 kW
230 V
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from $872.00
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Main
Stainless steel heat exchanger. Wide range of coolant temperature adjustment. Outside temperature sensor. Support for "warm floor" mode.
Energy sourcegasgas
Installationwallwall
Typesingle-circuit (heating only)single-circuit (heating only)
Heating area160 m²180 m²
Condensing
Technical specs
Heat output20 kW24.7 kW
Min. heat output3.9 kW3.5 kW
Power supply230 V230 V
Power consumption102 W
Coolant min. T30 °С25 °С
Coolant max. T85 °С80 °С
Heating circuit max. pressure3 bar3 bar
Consumer specs
Outdoor temperature sensor
"Summer" mode
Heated floor mode
Circulation pump
Control buseBus
Boiler specs
Efficiency108 %105.7 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter60/100 mm60/100 mm
Inlet gas pressure13 mbar20 mbar
Max. gas consumption2.6 m³/h2.61 m³/h
Expansion vessel capacity10 L7 L
Expansion vessel pressure0.8 bar
Heat exchangerstainless steelstainless steel
Connections
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
frost protection
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
More specs
Dimensions (HxWxD)720x440x338 mm700x400x299 mm
Weight33 kg34 kg
Added to E-Catalogapril 2017april 2013

Heating area

A very conditional parameter that slightly characterizes the purpose based on the size of the room. And depending on the height of the ceilings, layout, building design and equipment, actual values may differ significantly. However, this item represents the maximum recommended area of the room that the boiler can effectively heat. However, it is worth considering that different buildings have different thermal insulation properties and modern buildings are much “warmer” than 30-year-old and especially 50-year-old houses. Accordingly, this item is more of a reference nature and does not allow us to fully assess the actual heated area. There is a formula by which you can derive the maximum heating area, knowing the useful power of the boiler and the climatic conditions in which it will be used; For more information on this, see "Useful Power". In our case, the heating area is calculated using the formula “boiler power multiplied by 8”, which is approximately equivalent to use in houses that are several decades old.

Heat output

It is the maximum useful power of the boiler.

The ability of the device to heat a room of a particular area directly depends on this parameter; by power, you can approximately determine the heating area, if this parameter is not indicated in the specs. The most general rule says that for a dwelling with a ceiling height of 2.5 – 3 m, at least 100 W of heat power is needed to heat 1 m2 of area. There are also more detailed calculation methods that take into account specific factors: the climatic zone, heat gain from the outside, design features of the heating system, etc.; they are described in detail in special sources. Also note that in dual-circuit boilers (see "Type"), part of the heat generated is used to heat water for the hot water supply; this must be taken into account when evaluating the output power.

It is believed that boilers with a power of more than 30 kW must be installed in separate rooms (boiler rooms).

Min. heat output

The minimum heat output at which the heating boiler can operate in constant mode. Operation at minimum power allows you to reduce the number of on-and-off cycles that adversely affect the durability of heating boilers.

Power consumption

The maximum electrical power consumed by the boiler during operation. For non-electric models (see Energy source), this power is usually low, as it is required mainly for control circuits and it can be ignored. Regarding electric boilers, it is worth noting that the power consumption in them is most often somewhat higher than the useful one since part of the energy is inevitably dissipated and not used for heating. Accordingly, the ratio of useful and consumed power can be used to evaluate the efficiency of such a boiler.

Coolant min. T

The minimum operating temperature of the heat medium in the boiler system when operating in heating mode.

Coolant max. T

The maximum operating temperature of the heat medium in the boiler system when operating in heating mode.

Outdoor temperature sensor

The outdoor temperature sensor allows you to monitor the outdoor weather conditions and automatically adjust the operation of the boiler to them — increase the heating power when the outside temperature drops and decrease it when it rises.

"Summer" mode

It is an operating mode designed for the warm season. In this mode, it works only to provide domestic hot water, and the heating is turned off. If the boiler is equipped with an outside temperature sensor, this sensor is also switched off in summer mode so that the heating does not turn on at night when the outside temperature drops.

Heated floor mode

The boiler has a special mode for underfloor heating systems.

Underfloor heating differs from conventional heating systems primarily by a lower coolant temperature — otherwise the floor could be too hot for comfortable use (plus, high temperatures are also undesirable for flooring and furniture installed on it). In addition, boilers with this function are distinguished by increased pump power. In order to ensure efficient circulation of the coolant through branched heating circuits that have rather high resistance.
Vaillant ecoTEC plus VU INT 246/5-5 often compared
BAXI Duo-tec Compact 1.24 often compared