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Comparison Bosch Gaz 6000 WBN-24H RN 24 kW vs BAXI LUNA-3 Comfort 240 Fi 25 kW

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Bosch Gaz 6000 WBN-24H RN 24 kW
BAXI LUNA-3 Comfort 240 Fi 25 kW
Bosch Gaz 6000 WBN-24H RN 24 kWBAXI LUNA-3 Comfort 240 Fi 25 kW
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Main
Compact dimensions. Wide power control range. Low noise level. Stable operation at low inlet gas pressure. Low outdoor temperature and mains voltage fluctuations. Built-in 3-way valve for boiler connection.
Energy sourcegasgas
Installationwallwall
Typesingle-circuit (heating only)dual-circuit (heating and DHW)
Heating area192 m²188 m²
Additional equipment
Remote control unit
Technical specs
Heat output24 kW25 kW
Min. heat output7.2 kW9.3 kW
Power supply230 V230 V
Power consumption150 W135 W
Coolant min. T40 °С30 °С
Coolant max. T82 °С85 °С
Heating circuit max. pressure3 bar
DHW circuit max. pressure8 bar
Consumer specs
DHW min. T35 °С
DHW max. T65 °С
Performance (ΔT=25°C)14.3 L/min
Performance (ΔT ~30 °C)10.2 L/min
"Summer" mode
Heated floor mode
Circulation pump
Control busOpenThermOpenTherm
Programmable thermostat
Boiler specs
Efficiency93.2 %92.9 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter
60/100 mm /80/80 mm for separate/
60/100 mm /80/80 for split flue/
Inlet gas pressure16 mbar20 mbar
Max. gas consumption2.8 m³/h2.84 m³/h
Expansion vessel capacity6 L8 L
Expansion vessel pressure0.5 bar0.5 bar
Heat exchangercopper
Connections
Mains water intake1/2"
DHW flow1/2"
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
power outage
 
frost protection
More specs
Dimensions (HxWxD)700x400x299 mm760x450x345 mm
Weight30 kg38 kg
Added to E-Catalogaugust 2014august 2010

Type

Depending on the set of functions, boilers are divided into single-circuit and dual-circuit.

- Single-circuit boilers are equipped with one heat exchanger, in which the heat from fuel combustion is transferred to the heat medium of the heating system. The only function of such boilers is space heating. It is technically possible to use single-circuit boilers to provide hot water, but this requires an additional tank (the so-called indirect water heater).

- In dual-circuit boilers, the primary heat exchanger is supplemented by a secondary one. Due to this, such a boiler, in addition to heating the room, also provides a hot water supply. In this case, both running water and water accumulated in a special tank(see Built-in water heater tank) can be used.

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.

Remote control unit

Remote control unit that allows you to control the boiler from another room. It can be connected both wired and wirelessly, often equipped with an electronic display to indicate operating modes, set temperature, emergency situations, etc. Many of these units are advanced devices with the ability to programme the operation of the boiler, for example, for a week; some models can be equipped with temperature sensors that automatically adjust the intensity of the boiler depending on the temperature in the room.

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.

Coolant min. T

The minimum operating temperature of the heat medium in the boiler system when operating in heating mode.

Coolant max. T

The maximum operating temperature of the heat medium in the boiler system when operating in heating mode.

Heating circuit max. pressure

The maximum pressure in the heating circuit of the boiler, at which it remains operational, and there is no risk of physical damage to the structure. For a heating system, the maximum pressure is usually about 3 bar, and for a domestic hot water circuit up to 10 bar. When the maximum pressure is exceeded, a safety valve is activated, and part of the water is discharged from the system until a normal pressure level is reached.
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