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Comparison Vaillant turboTEC plus VU 242/5-5 24.9 kW vs Vaillant turboTEC pro VUW 242/5-3 24.9 kW

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Vaillant turboTEC plus VU 242/5-5 24.9 kW
Vaillant turboTEC pro VUW 242/5-3 24.9 kW
Vaillant turboTEC plus VU 242/5-5 24.9 kWVaillant turboTEC pro VUW 242/5-3 24.9 kW
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Main
Quality hydraulic fittings made of bronze alloy. Economical power consumption. Built-in eBus for remote communication. Wide range of burner power control.
DHW capacity at Δt=30° – 11.5 L/min. Protection against disturbance of water circulation. Possibility of connection to a solar collector and heat pump.
Energy sourcegasgas
Installationwallwall
Typesingle-circuit (heating only)dual-circuit (heating and DHW)
Heating area199 m²199 m²
Technical specs
Heat output24.9 kW24.9 kW
Min. heat output8 kW8 kW
Power supply230 V230 V
Power consumption142 W142 W
Coolant min. T30 °С30 °С
Coolant max. T80 °С80 °С
Heating circuit max. pressure3 bar3 bar
DHW circuit max. pressure10 bar
Consumer specs
DHW min. T35 °С
DHW max. T65 °С
"Summer" mode
Warm start
Circulation pump
Control buseBuseBus
Boiler specs
Efficiency93 %93 %
Combustion chamberclosed (turbocharged)closed (turbocharged)
Flue diameter60/100 mm60/100 mm
Inlet gas pressure20 mbar
Max. gas consumption2.8 m³/h2.8 m³/h
Expansion vessel capacity10 L6 L
Coolant performance1032 L/h1032 L/h
Heat exchangercoppercopper
Connections
Mains water intake3/4"
DHW flow3/4"
Gas supply1/2"1/2"
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
 
More specs
Dimensions (HxWxD)800x440x338 mm800x400x338 mm
Weight41 kg40 kg
Added to E-Catalogoctober 2017november 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.

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.

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.

Inlet gas pressure

It is the optimum gas pressure supplied to the inlet of the boiler system. Most often indicated for natural gas and is about 15-20 mbar. This parameter must match the specs of the gas supply system. However, the pressure in the latter may be higher, which may require the installation of a special gas regulator.

Expansion vessel capacity

The capacity of the expansion tank supplied with the boiler.

The expansion tank is designed to drain excess water from the heating system when the total volume of liquid increases as a result of heating. It consists of two parts connected by a flexible membrane: in one, hermetically closed, there is air under pressure; in the other, excess water enters, compressing the membrane. In this way, a catastrophic increase in pressure in the heating circuit is avoided. The optimal volume of the expansion tank depends on several system parameters, primarily the volume and composition of the coolant; detailed recommendations for calculations can be found in special sources.

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".
Vaillant turboTEC plus VU 242/5-5 often compared
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