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Comparison Bosch Gaz 4000 ZWA24-2A 24 kW
230 V
vs Bosch Gaz 4000 ZWA24-2K 24 kW
230 V

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Bosch Gaz 4000 ZWA24-2A 24 kW 230 V
Bosch Gaz 4000 ZWA24-2K 24 kW 230 V
Bosch Gaz 4000 ZWA24-2A 24 kW
230 V
Bosch Gaz 4000 ZWA24-2K 24 kW
230 V
from $511.79
Outdated Product
from $447.30 up to $583.00
Outdated Product
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Energy sourcegasgas
Installationwallwall
Typedual-circuit (heating and DHW)dual-circuit (heating and DHW)
Heating area180 m²180 m²
Technical specs
Heat output24 kW24 kW
Min. heat output7.8 kW
Power supply230 V230 V
Power consumption130 W90 W
Coolant min. T38 °С
Coolant max. T85 °С85 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure10 bar10 bar
Consumer specs
DHW min. T40 °С40 °С
DHW max. T65 °С65 °С
Performance (ΔT=25°C)17.1 L/min17.1 L/min
Performance (ΔT ~30 °C)11.4 L/min11.4 L/min
"Summer" mode
Circulation pump
Boiler specs
Combustion chamberclosed (turbocharged)open (atmospheric)
Flue diameter60/100 mm130 mm
Inlet gas pressure13 mbar13 mbar
Max. gas consumption2.72 m³/h2.8 m³/h
Expansion vessel capacity8 L8 L
Expansion vessel pressure0.5 bar0.5 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
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)750x400x355 mm750x400x355 mm
Weight37.9 kg33 kg
Added to E-Catalogmarch 2012march 2012

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.

Combustion chamber

The type of combustion chamber provided in the boiler.

Open(atmospheric). Combustion chambers of this type consume air from the room in which the boiler is installed, and the combustion products are naturally removed through the flue. Boilers of this design are simple and inexpensive but have specific installation requirements: the room must be well-ventilated, and the height of the chimney must be at least 4 m to ensure sufficient draft.

Closed(turbocharged). Closed combustion chambers are isolated from the room in which the boiler is installed: combustion air is taken from the street, and combustion products are removed there. For this, a coaxial flue is usually used — in the form of two pipes nested one inside the other: combustion products are removed through the inner one, and the outer one is responsible for the air supply. Turbocharged combustion chambers are more complicated and expensive than open ones, and the maximum length of the chimney is limited. On the other hand, such a boiler does not burn the air in the room, and it can be installed anywhere, regardless of the ventilation efficiency.

— Is absent. Boilers powered by electricity do not have combustion chambers (see "Source of 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.

Max. gas consumption

Maximum gas consumption in the boiler with the corresponding energy source (see above). Achieved when the gas heater is operating at full capacity; with reduced power and consumption, respectively, will be lower.

Note that boilers of the same power may differ in gas consumption due to the difference in efficiency. While the more fuel-efficient models tend to cost more, the price difference pays off in gas savings.
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