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Comparison Roda Micra Duo OC 24 23.3 kW vs Italtherm CITY CLASS 24 C 23.3 kW

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Roda Micra Duo OC 24 23.3 kW
Italtherm CITY CLASS 24 C 23.3 kW
Roda Micra Duo OC 24 23.3 kWItaltherm CITY CLASS 24 C 23.3 kW
Outdated ProductOutdated Product
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Energy sourcegasgas
Installationwallwall
Typedual-circuit (heating and DHW)dual-circuit (heating and DHW)
Heating area186 m²186 m²
Technical specs
Heat output23.3 kW23.3 kW
Min. heat output8.6 kW
Power supply230 V230 V
Power consumption75 W75 W
Coolant min. T35 °С35 °С
Coolant max. T80 °С80 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure6 bar6 bar
Consumer specs
DHW min. T35 °С35 °С
DHW max. T55 °С55 °С
Performance (ΔT=25°C)13.6 L/min13.3 L/min
"Summer" mode
Heated floor mode
Circulation pump
Boiler specs
Efficiency90.5 %90.5 %
Combustion chamberopen (atmospheric)open (atmospheric)
Flue diameter130 mm
Inlet gas pressure20 mbar20 mbar
Max. gas consumption2.72 m³/h2.72 m³/h
Expansion vessel capacity8 L8 L
Expansion vessel pressure1 bar1 bar
Connections
Mains water intake1/2"1/2"
DHW flow1/2"1/2"
Gas supply3/4"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)727x400x318 mm727x400x300 mm
Weight26.8 kg26.8 kg
Added to E-Catalogmay 2019august 2017

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.

Performance (ΔT=25°C)

The performance of a dual-circuit boiler in the DHW supply mode when the water is heated by 25 °C above the initial temperature.

Performance is the maximum amount of hot water the unit can produce in a minute. It depends not only on the power of the heater as such, but also on how much water needs to be heated: the higher the temperature difference ΔT between cold and heated water, the more energy is required for heating and the smaller the volume of water with which the boiler can handle in this mode. Therefore, the performance of dual-circuit boilers is indicated for certain options ΔT — namely 25 °C, 30 °C and/or 50 °C. And it’s worth choosing according to this indicator, taking into account the initial water temperature and taking into account what kind of hot water demand there is at the installation site of the boiler (how many points of water intake, what are the temperature requirements, etc.). Recommendations on this subject can be found in special sources.

We also recall that water begins to be felt by a person as warm somewhere from 40 °C, as hot — somewhere from 50 °C, and the temperature of hot water in central water supply systems (according to official standards) is at least 60 °C. Thus, for the boiler to operate in the ΔT=25 °C mode and produce at least warm water at 40 °C, the initial temperature of cold water must be at least 15 °C (15+25=40 °C). It is a rather high value — for example, in a centralized water supply system, cold water...reaches 15 °C, except in summer, when the water pipes warm up noticeably; the same applies to water supplied from wells. So this performance is a very conditional value. The boiler does not work so often with a temperature difference of 25 °C. Nevertheless, the data for ΔT=25°C is still often given in the specifications — including for advertising purposes since it is in this mode that the performance figures are the highest. In addition, this information may be useful if the boiler is used as a pre-heater, and heating to operating temperature is provided by another device, such as an electric boiler or instantaneous water heater.

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.

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.

Gas supply

The diameter of the pipe for connecting the gas supply pipe in the boiler with the corresponding type of power supply (see "Energy source").

Diameters are indicated in inches. In some cases, it is allowed to connect a pipe of a different diameter through an adapter, but the best option is still a match in size. The most common options are 1/2" and 3/4".
Roda Micra Duo OC 24 often compared
Italtherm CITY CLASS 24 C often compared