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Comparison Buderus Logamax U072-24K 24 kW vs Bosch Gaz 6000 WBN-24C RN 24 kW

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Buderus Logamax U072-24K 24 kW
Bosch Gaz 6000 WBN-24C RN 24 kW
Buderus Logamax U072-24K 24 kWBosch Gaz 6000 WBN-24C RN 24 kW
from $598.21 up to $732.09
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from $536.40 up to $709.58
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DHW capacity at Δt=30° - 11.4 L/min, at Δt=50° - 6.8 L/min. A light weight. Frost protection. Resistant to mains voltage fluctuations. Ability to work with liquefied gas.
DHW capacity at Δt=30° - 11.4 L/min, at Δt=50° - 6.8 L/min. Light weight. Frost protection. Resistant to mains voltage fluctuations. Ability to work with liquefied gas.
Energy sourcegasgas
Installationwallwall
Typedual-circuit (heating and DHW)dual-circuit (heating and DHW)
Heating area192 m²192 m²
Technical specs
Heat output24 kW24 kW
Min. heat output7.2 kW7.2 kW
Power supply230 V230 V
Power consumption150 W
Coolant min. T40 °С40 °С
Coolant max. T82 °С82 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure10 bar10 bar
Consumer specs
DHW min. T40 °С35 °С
DHW max. T60 °С60 °С
"Summer" mode
Heated floor mode
Circulation pump
Control busOpenThermOpenTherm
Boiler specs
Efficiency93.2 %93.2 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter
60/100 mm /80/80 mm for separate/
60/100 mm /80/80 mm for separate/
Inlet gas pressure16 mbar16 mbar
Max. gas consumption2.8 m³/h2.8 m³/h
Expansion vessel capacity8 L8 L
Expansion vessel pressure0.5 bar0.5 bar
Heat exchangercoppercopper
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
 
frost protection
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
More specs
Dimensions (HxWxD)700x400x299 mm700x400x299 mm
Weight34 kg31 kg
Added to E-Catalogdecember 2014august 2014

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.

DHW min. T

The minimum temperature of domestic hot water (DHW) supplied by a dual-circuit boiler. For comparison, we note that water begins to be perceived as warm, starting from 40 °C, and in centralized hot water supply systems, the temperature of hot water is usually about 60 °C (and should not exceed 75 °C). At the same time, in some boilers, the minimum heating temperature can be only 10 °C or even 5 °C. A similar mode of operation is used to protect pipes from freezing during the cold season: the circulation of water with a positive temperature prevents the formation of ice inside and damage to the circuits.

It is also worth keeping in mind that when heated to a given temperature, the temperature difference ("ΔT") may be different — depending on the initial temperature of the cold water. And the performance of the boiler in the DHW mode directly depends on ΔT; see below for performance details.

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.

Safety systems

Gas pressure drop. This protection system ensures that the boiler is switched off in the event of a critical drop in gas pressure, insufficient for the normal functioning of the burner. In the event of such a fall, the valve that supplies gas to the burner is closed and blocked. After the restoration of gas pressure, it also remains closed; it is necessary to open it and resume the gas supply manually.

Water overheating. A temperature sensor automatically turns off the boiler when the temperature of the water in the system is critically exceeded.

Flame loss. Flame loss protection is based on a sensor that monitors the combustion of gas and automatically stops its supply. It prevents the room from filling with gas and the possible tragic consequences of this.

Draft control. In boilers with an open combustion chamber, to maintain normal conditions in the room where such a boiler is installed, constant removal of products of combustion into the atmosphere is necessary. The lack of a normal draft in the chimney can lead to the accumulation of combustion products in the room. The draft protection system prevents this by automatically turning off the boiler when it detects the release of combustion products outside the chimney.

Power outage. Most modern boilers h...ave an electronic control system; in addition, many structural elements (pumps, valves, fans, etc.) are also powered by electricity. Thus, a power outage during the operation of the boiler will inevitably lead to an abnormal mode of operation, which is fraught with breakdowns and even accidents. To prevent such cases, a power outage protection system is installed, which completely stops the operation of the boiler in the event of a power outage. When the power supply is restored, the boiler needs to be restarted manually.

Water circulation failure. This protection system controls the normal movement of the water through the heating circuit. Water circulation failure can lead to overheating of some elements of the boiler and damage to it. To avoid this, if the circulation is disturbed, the system turns off the pump and shuts off the gas supply to the burner.

Frost protection. A system that controls the temperature in the heating circuit. Freezing of the liquid in the circuit disrupts the normal operation of the heating, which may require heating of the pipes and lead to system damage. To avoid this, when the water temperature drops below 5 °C, the burner is ignited, the circulation pump is activated, and the circuit warms up to a temperature of about 35 °C — thus preventing the formation of ice in the pipes.
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