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Comparison Viessmann Vitopend 100-W A1JB 24 kW 24 kW vs Buderus Logamax Plus GB172i-24 24 kW

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Viessmann Vitopend 100-W A1JB 24 kW 24 kW
Buderus Logamax Plus GB172i-24 24 kW
Viessmann Vitopend 100-W A1JB 24 kW 24 kWBuderus Logamax Plus GB172i-24 24 kW
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Main
DHW capacity at Δt=30° – 11.2 L/min. Resistant to mains voltage fluctuations. Built-in weekly timer. Ability to work with liquefied gas.
Energy sourcegasgas
Installationwallwall
Typedual-circuit (heating and DHW)single-circuit (heating only)
Heating area192 m²192 m²
Condensing
Technical specs
Heat output24 kW24 kW
Min. heat output3 kW
Power supply230 V230 V
Power consumption120 W98 W
Coolant min. T40 °С30 °С
Coolant max. T80 °С82 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure10 bar
Consumer specs
DHW min. T35 °С
DHW max. T57 °С
"Summer" mode
Circulation pump
Control busOpenThermEMS
Programmable thermostat
Boiler specs
Efficiency91 %109 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter60/100 mm80/125 mm
Inlet gas pressure16 mbar
Max. gas consumption2.77 m³/h2.59 m³/h
Expansion vessel capacity6 L12 L
Expansion vessel pressure1 bar0.75 bar
Heat exchangerstainless steelaluminium
Connections
Mains water intake1/2"
DHW flow1/2"
Gas supply3/4"1"
Central heating flow3/4"3/4"
Central heating return3/4"3/4"
Safety
Safety systems
gas pressure drop
water overheating
flame loss
draft control
gas pressure drop
water overheating
flame loss
draft control
More specs
Glass panel
Dimensions (HxWxD)725x400x340 mm840x440x360 mm
Weight32 kg43 kg
Added to E-Catalogaugust 2017april 2017

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.

Condensing

Boilers generate additional heat by condensing water vapour from combustion products. In such units, the combustion gases, before entering the flue, are passed through an additional heat exchanger, in which they are cooled, and the water vapour condenses and transfers thermal energy to the coolant. It allows you to increase the efficiency by 10 – 15% compared to boilers of the classical design — up to the fact that in many similar models, the efficiency exceeds 100% (for more details, see "Efficiency").

The condensation principle of operation is most often found in gas models (see "Power source"); however, solid and liquid fuel boilers with this feature are also produced.

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.

DHW circuit max. pressure

The maximum pressure in the hot water circuit (DHW) at which it can operate for a long time without failures and damage. See "Heating circuit maximum pressure".

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.

DHW max. T

The maximum temperature of domestic hot water 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). Accordingly, even in the most modest models, this figure is about 45 °C, in the vast majority of modern boilers, it is not lower than 50 °C, and in some models, it can even exceed 90 °C.

Also 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.
Viessmann Vitopend 100-W A1JB 24 kW often compared
Buderus Logamax Plus GB172i-24 often compared