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Comparison Bosch Gaz 6000 WBN-35H RN 37.4 kW vs Bosch Gaz 6000 WBN-35C RN 37.4 kW

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Bosch Gaz 6000 WBN-35H RN 37.4 kW
Bosch Gaz 6000 WBN-35C RN 37.4 kW
Bosch Gaz 6000 WBN-35H RN 37.4 kWBosch Gaz 6000 WBN-35C RN 37.4 kW
from $791.82
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from $752.00 up to $830.58
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Energy sourcegasgas
Installationwallwall
Typesingle-circuit (heating only)dual-circuit (heating and DHW)
Heating area299 m²299 m²
Technical specs
Heat output37.4 kW37.4 kW
Min. heat output12.2 kW12.2 kW
Power supply230 V230 V
Coolant min. T40 °С40 °С
Coolant max. T82 °С85 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure10 bar
Consumer specs
DHW min. T35 °С
DHW max. T60 °С
"Summer" mode
Heated floor mode
Warm start
Circulation pump
Control busOpenThermOpenTherm
Boiler specs
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 consumption3.9 m³/h3.9 m³/h
Expansion vessel capacity10 L10 L
Heat exchangercoppercopper
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
water circulation failure
frost protection
More specs
Dimensions (HxWxD)700x485x315 mm700x485x315 mm
Weight39 kg39 kg
Added to E-Catalogjune 2016june 2016

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.

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.

"Summer" mode

It is an operating mode designed for the warm season. In this mode, it works only to provide domestic hot water, and the heating is turned off. If the boiler is equipped with an outside temperature sensor, this sensor is also switched off in summer mode so that the heating does not turn on at night when the outside temperature drops.

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.

Warm start

Support for the warm start function by the boiler.

This function is found only in dual-circuit models (see "Type"): it accelerates the water heating for the domestic hot water system and ensures a constant leaving water temperature. To do this, the boiler automation monitors and controls the temperature of the water in the secondary heat exchanger of the boiler. The presence of a "warm start" affects the cost of the unit, but this is offset by the ease of use.

Mains water intake

The diameter of the pipe for connecting the pipe through which cold water is supplied to the boiler for heating and use in the hot water supply system.

Diameters are indicated in inches. It is allowed to connect a pipe of a different diameter through an adapter, but the best option is still a match in size. There are connection options 1/2", 3/4", 1" and 1 1/2".
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