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Comparison Teknix ESPRO 12 kW 12 kW
400 H
vs Bosch Tronic Heat 3500 12 11.88 kW
400 H

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Teknix ESPRO 12 kW 12 kW 400 H
Bosch Tronic Heat 3500 12 11.88 kW 400 H
Teknix ESPRO 12 kW 12 kW
400 H
Bosch Tronic Heat 3500 12 11.88 kW
400 H
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Wi-Fi control. Possibility of connecting an indirect heating boiler. Economic circulation pulser with frequency regulation Wilo-Yonos PARA. Heating elements and heating flask made of stainless steel. Rotation of heating elements is used to increase the service life.
Energy sourceelectricityelectricity
Installationwallwall
Typesingle-circuit (heating only)single-circuit (heating only)
Heating area96 m²95 m²
Technical specs
Heat output12 kW11.88 kW
Min. heat output
2 kW /6 heating elements of 2 kW/
4 kW
Power supply400 V400 V
Power consumption
43 W /3 – 43 W (pump)/
Rated current18 А
Coolant min. T30 °С
Coolant max. T80 °С85 °С
Heating circuit max. pressure3 bar3 bar
Consumer specs
DHW min. T30 °С
DHW max. T60 °С
Wi-Fi
Circulation pump
 /Wilo-Yonos PARA/
Programmable thermostat
 /weekly/
Boiler specs
Efficiency99 %99.7 %
Combustion chamberno chamberno chamber
Expansion vessel capacity
6 L /stainless steel/
7 L
Connections
Central heating flow3/4"3/4"
Central heating return3/4"3/4"
Safety
Safety systems
water overheating
power outage
water circulation failure
frost protection
water overheating
 
 
frost protection
More specs
Glass panel
Dimensions (HxWxD)744x375x248 mm712x330x273 mm
Weight24 kg17 kg
Added to E-Catalognovember 2021september 2016

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.

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.

Rated current

The current consumed by the electric boiler (see "Power source") during normal operation.

This parameter directly depends on the power. It is required primarily for organizing the connection: wiring and automation must safely deal with the current consumed by the unit.

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 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.
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