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Comparison Protherm Skat 9KE/14 9 kW
230 V / 400 V
vs Vaillant eloBLOCK VE 6 6 kW
230 V

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Protherm Skat 9KE/14 9 kW 230 V / 400 V
Vaillant eloBLOCK VE 6 6 kW 230 V
Protherm Skat 9KE/14 9 kW
230 V / 400 V
Vaillant eloBLOCK VE 6 6 kW
230 V
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This is an updated series of Skat. The design and layout of the boiler has been slightly changed. New control panel. Built-in eBUS allows connection of Protherm Thermolink P, Protherm Exacontrol 7, Vaillant eRELAX, Vaillant multiMATIC VRC 700/6 thermostats
3-stage circulation pump. Warm floor mode. Wide range of temperature settings for heating and hot water. Frost protection function. Ability to work in cascade, with a heat pump, gas boiler and solar system.
Energy sourceelectricityelectricity
Installationwallwall
Typesingle-circuit (heating only)single-circuit (heating only)
Heating area72 m²45 m²
Technical specs
Heat output9 kW
6 kW /3+3 kW/
Min. heat output3 kW3 kW
Power supply230 V / 400 V
230 V /400 V/
Rated current16 А28.5 А
Coolant min. T25 °С25 °С
Coolant max. T85 °С85 °С
Heating circuit max. pressure3 bar3 bar
Consumer specs
"Summer" mode
Heated floor mode
Circulation pump
Control buseBuseBus
Boiler specs
Efficiency99.5 %99 %
Combustion chamberno chamberno chamber
Expansion vessel capacity8 L8 L
Coolant performance516 L/h
Connections
Central heating flow3/4"3/4"
Central heating return3/4"3/4"
Safety
Safety systems
water overheating
water circulation failure
frost protection
water overheating
water circulation failure
frost protection
More specs
Dimensions (HxWxD)740x410x310 mm740x410x315 mm
Weight24 kg24 kg
Added to E-Catalogmay 2019june 2012

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).

Power supply

The type of electrical supply required for normal operation of the boiler. Power supply may be required not only for electric models but also for other types of boilers (see "Power supply") — in particular, for the operation of control automation. Connection options can be:

230 V. Work from a household system with a voltage of 230 V. At the same time, models with a power consumption of up to 3.5 kW can be connected to a standard outlet, but for high consumption devices, you need to connect directly to the distribution board. Many of the electric boilers with this connection also allow operation from 400 V (see below).

400 V. Operation from a three-phase system with a voltage of 400 V. This power supply is suitable for boilers with any power consumption. However, it is not as common as 230 V: in particular, it may be difficult to use it in a residential area. Therefore, this option is provided mainly in high-power devices for which a 230 V power supply is not suitable.

— Autonomous work. Work in completely autonomous mode, without an electricity connection. This format of operation is found in all boilers that do not use electrical heating (see "Energy source"), except for purely liquid fuel ones — in them, electricity is necessary for the operation of the fuel supply systems.

Rated current

The current consumed by the electric boiler (see "Power source") during normal operation.

This parameter directly depends on the power. It is required primarily for organizing the connection: wiring and automation must safely deal with the current consumed by the unit.

"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.

Efficiency

The efficiency of the boiler.

For electric models (see "Energy source"), this parameter is calculated as the ratio of net power to consumed; in such models, indicators of 98 – 99% are not uncommon. For other boilers, the efficiency is the ratio of the amount of heat directly transferred to the water to the total heat amount released during combustion. In such devices, the efficiency is lower than in electric ones; for them, a parameter of more than 90% is considered good. An exception is gas condensing boilers (see the relevant paragraph), where the efficiency can even be higher than 100%. There is no violation of the laws of physics here. It is a kind of advertising trick: when calculating the efficiency, an inaccurate method is used that does not take into account the energy spent on the formation of water vapour. Nevertheless, formally everything is correct: the boiler gives out more thermal energy to the water than is released during the combustion of fuel since condensation energy is added to the combustion energy.

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.
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