Vaillant ecoTEC exclusive VMW 43CF/1-7 SfI boiler

Condensing boiler · New equipmentVaillant ecoTEC exclusive VMW 43CF/1-7 SfI

Vaillant ecoTEC exclusive VMW 43CF/1-7 SfI boiler

VAT includedIn stock

The ecoTEC exclusive VMW 43CF offers 42.8 kW of domestic hot water and 20.4 l/min at ΔT 30 K. Its heating range is from 4.2 to 33.2 kW at 80/60 °C. The larger capacity requires checking the space: it has a depth of 450 mm and air intake and flue connection of 80/125 mm, different from the 30 and 36 versions. With sensoCOMFORT radio and myVaillant. Installation not included. VAT and mainland shipping included.

Heating power (80/60 °C): 4.2-33.2 kW
Specific flow rate for domestic hot water (ΔT 30 K): 20.4 l/min
Dimensions (height x width x depth): 720 x 440 x 450 mm

Condensing boiler

The model, at a glance

Vaillant ecoTEC exclusive 43CF: calefacción 4,2-33,2 kW a 80/60 °C, ACS 42,8 kW y caudal específico 20,4 l/min a ΔT 30 K.

Heating power (80/60 °C): 4.2-33.2 kW
Specific flow rate for domestic hot water (ΔT 30 K): 20.4 l/min
Dimensions (height x width x depth): 720 x 440 x 450 mm

Read the full description and what it includes.

The VMW 43CF is the highest capacity model among these three ecoTEC exclusive: it reaches 33.2 kW of heating at 80/60 °C and 36.0 kW at 50/30 °C. Its minimum power also increases, up to 4.2 and 4.9 kW respectively. For a highly insulated home or one with few open areas, that minimum should be considered alongside the maximum, rather than always opting for the most powerful version.

In domestic hot water, it delivers 42.8 kW. The specific flow rate of 20.4 l/min at ΔT 30 K allows for studying demands higher than those of the 36CF; the 24.5 l/min in the technical sheet corresponds to ΔT 25 K. Vaillant recommends it for three bathrooms, a toilet, and a kitchen, but three showers of 8 l/min at ΔT 30 K would add up to 24 l/min, exceeding its specific flow rate.

The sanitary limiter of 14.0 l/min should not be confused with that test flow rate or with the mixed water from the showers. Micro-accumulation improves the response when starting consumption, without constituting a large volume sanitary deposit. Network pressure, inlet temperature, and other taps affect the simultaneous capacity.

Although it maintains a height of 720 mm and a width of 440 mm, the depth increases to 450 mm and the net weight to 46 kg. The gas connection of the unit is 20 mm and the air and flue connection is 80/125 mm. These changes require a review of the space and installation during a replacement; it is not enough for the front to have the same size.

What is included in the purchase?

With sensoCOMFORT radio and myVaillant. Installation not included.

Price including VAT and shipping to mainland Spain. Installation, adaptations, and commissioning are valued separately.

Consult the manufacturer's PDFs ↓

Guide

What to check before installing this boiler

The choice of equipment does not replace the inspection of the installation by a qualified professional.

Confirm the model and commercial reference, the type of gas, and the supply configuration in the manufacturer's documentation.
Ask a qualified installer to assess the heating and domestic hot water demand; compare measured flow rates at the same temperature difference.
Check dimensions, connections, flue gas evacuation, condensate drainage, and controls compatible with the existing installation.
Confirm the included accessories and the delivery time before scheduling the installation. The online purchase of the equipment does not include installation or commissioning.

Technical data

Datos técnicos de Caldera Vaillant ecoTEC exclusive VMW 43CF/1-7 SfI

Brand: Vaillant
Model: Vaillant ecoTEC exclusive VMW 43CF/1-7 SfI boiler
Status: New
Supply scope: With sensoCOMFORT radio and myVaillant. Installation not included.
Shipping: Included in mainland Spain. Please confirm the deadline.
Commercial reference: 125834629

Specifications and dimensions of the model

Compare each magnitude under its testing conditions: heating, domestic hot water, efficiency, and dimensions.

Heating power G20 (80/60 °C): 4.2-33.2 kW
Heating
Heating power G20 (50/30 °C): 4.9-36.0 kW
Heating
Heating thermal load G20 (Hi): 4.5-34.2 kW
Heating
Adjustable flow temperature: 30-80 °C
Heating
Maximum heating pressure: 3 bar
Heating
Maximum power DHW G20: 42.8 kW
Hot water
Nominal thermal load DHW G20 (Hi): 40.0 kW
Hot water
Specific flow rate D (ΔT 30 K, EN 13203-1): 20.4 l/min
Hot water
Declared domestic hot water flow rate (ΔT 25 K): 24.5 l/min
Hot water
Minimum starting flow rate: 2.0 l/min
Hot water
Domestic hot water flow limiter: 14.0 l/min
Hot water
Adjustable domestic hot water temperature: 35-65 °C
Hot water
Allowed service pressure for domestic hot water: 0.3-10 bar
Hot water
Required connection pressure for domestic hot water: 0.7 bar
Hot water
Hot water system: Mixed with micro-accumulation
Hot water
Dimensions (height x width x depth): 720 x 440 x 450 mm
Dimensions and installation
Net weight: 46 kg
Dimensions and installation
Minimum lateral distance: 5 mm on each side
Dimensions and installation
Minimum inferior distance: 180 mm
Dimensions and installation
Minimum front service distance: 500 mm
Dimensions and installation
Distance greater with duct 60/100: 165 or 248 mm, according to the installation plan
Dimensions and installation
Maximum distance with duct 80/80: 220 mm
Dimensions and installation
Maximum distance with duct 80/125: 276 mm
Dimensions and installation
Natural gas connection pressure G20: 20 mbar
Gas and connections
Gas connection on the appliance: 20 mm
Gas and connections
Air connection and exhaust in the appliance: 80/125 mm
Gas and connections
NOx emissions class: 6
Gas and connections
Maximum electrical consumption in heating: 105 W
Electricity
Maximum electrical consumption in domestic hot water: 122 W
Electricity
Nominal power supply: 230 V / 50 Hz
Electricity
Standby power consumption: Less than 2 W
Electricity
Degree of protection: IPX5D
Electricity

Manufacturer's sources

PDF and documentation of the model

Original documents, unmodified. Refer to the installation plan and the conditions of each data point before selecting the equipment.

The gallery sheets are summaries of Uniclima based on these documents. The external volume diagram does not represent connections, accessories, or service distances.

Frequently Asked Questions

Frequently asked questions: calderas de condensación 125834629

Is the exclusive 43CF the best option for any 200 m² house?

Not necessarily. In an example of 200 m² with assumed losses of 80 W/m², the load would be 16 kW; it is not a surface limit set by the manufacturer. The 43CF operates between 4.2 and 33.2 kW at 80/60 °C, so it is important to cover cold days as well as adapt to low demands. A well-insulated house may require less heating power even if it has many bathrooms. The domestic hot water demand and the thermal load should be sized separately.

Can the 43CF supply two or three showers simultaneously?

With showers of 8 l/min, two require 16 l/min and three require 24 l/min. If the water enters at 10 °C and is used at 40 °C, the temperature rise is 30 K: their 20.4 l/min specific flow exceeds the first example, but not the second. It is not a guarantee of two actual showers: pressure, temperature, other taps, and mixing are factors. The limiter of 14.0 l/min is a different data point and should not be modified in an attempt to reach an advertised flow rate.

Does it have a tank to supply three bathrooms or just micro-accumulation?

The 43CF belongs to the mixed range with micro-accumulation. The commercial recommendation from three bathrooms, a toilet, and a kitchen does not indicate that it includes a large tank or that all can consume at the same time. There are no integrated domestic hot water reserve liters specified in this documentation. For sustained consumption, it has a production of 42.8 kW and the available flow rate; a project with accumulation requires selecting and sizing that solution explicitly.

Does the 43CF fit in the same cabinet as the exclusive 36CF?

The 43CF has a depth of 450 mm compared to 382 mm of the 36CF: it requires an additional 68 mm just for the body. Both measure 720 x 440 mm in height and width. It is necessary to reserve 5 mm on the sides, 180 mm below, and 500 mm for front access. With its air intake and exhaust connection of 80/125, the manual indicates 276 mm above. The connections and the exhaust system must be checked, not adapted solely based on the similarity of the front.

What changes in heating and installation between the 36CF and the 43CF?

The 43CF increases the maximum heating output from 25.0 to 33.2 kW at 80/60 °C, but it also raises the minimum from 3.0 to 4.2 kW. It changes from 41 to 46 kg, from 382 to 450 mm in depth, from a gas connection of 15 to 20 mm, and from a flue of 60/100 to 80/125 mm. The specific flow rate of domestic hot water rises from 17.4 to 20.4 l/min at ΔT 30 K. These are changes that require reviewing demand, support, and connections.

What is the electrical consumption of the exclusive 43CF compared to the 36CF?

The declared maximum for the 43CF is 105 W in heating and 122 W in domestic hot water, compared to 61 and 113 W for the 36CF. Both indicate less than 2 W in standby. These are not permanent consumptions nor gas expenses: they depend on the mode and operating time. The estimated energy data displayed by the unit should not be used as a bill or as a substitute for the meter reading.

Does the price include installation and shipping?

Includes VAT and shipping to mainland Spain. Installation and adaptations are valued separately. With sensoCOMFORT radio and myVaillant. Installation not included.