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Comparison Beretta CIAO 24 CSI 23.9 kW vs Beretta CITY 24 CSI 24 kW
230 V

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Beretta CIAO 24 CSI 23.9 kW
Beretta CITY 24 CSI 24 kW 230 V
Beretta CIAO 24 CSI 23.9 kWBeretta CITY 24 CSI 24 kW
230 V
from $364.00 up to $448.88
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from $396.00 up to $486.16
Outdated Product
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Energy sourcegasgas
Installationwallwall
Typedual-circuit (heating and DHW)dual-circuit (heating and DHW)
Heating area179 m²180 m²
Technical specs
Heat output23.9 kW24 kW
Min. heat output7.5 kW
Power supply230 V230 V
Power consumption100 W125 W
Coolant min. T40 °С40 °С
Coolant max. T90 °С90 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure6 bar6 bar
Consumer specs
DHW min. T37 °С37 °С
DHW max. T60 °С60 °С
Performance (ΔT=25°C)13.7 L/min13.7 L/min
Performance (ΔT ~30 °C)9.8 L/min9.8 L/min
"Summer" mode
Circulation pump
Boiler specs
Efficiency92.8 %91.7 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter100 mm
60/100 mm /80/80 for split flue/
Inlet gas pressure20 mbar20 mbar
Max. gas consumption2.73 m³/h2.73 m³/h
Expansion vessel capacity7 L8 L
Expansion vessel pressure1 bar1 bar
Connections
Mains water intake1/2"1/2"
DHW flow1/2"1/2"
Gas supply3/4"3/4"
Central heating flow3/4"3/4"
Central heating return3/4"3/4"
Safety
Safety systems
gas pressure drop
flame loss
power outage
frost protection
gas pressure drop
flame loss
power outage
frost protection
More specs
Dimensions (HxWxD)715x405x248 mm715x405x248 mm
Weight28 kg34 kg
Added to E-Catalogseptember 2010september 2010

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.

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.

Flue diameter

The diameter of the pipe through which combustion products are discharged from the combustion chamber.

In boilers with a closed combustion chamber often used the coaxial flue, consisting of two pipes nested one inside the other. At the same time, products of combustion are discharged from the combustion chamber through the inner pipe, and the air is supplied through the gap between the inner and outer ones. For such flues, the diameter is usually shown in the form of two numbers — the diameter of the inner and outer pipes, respectively. The most popular values are 60/100, 80/80 and 80/125. Non-coaxial flues can be 100, 110, 125, 130, 140, 150, 160, 180 and 200 mm.

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.
Beretta CIAO 24 CSI often compared
Beretta CITY 24 CSI often compared