Vaillant ecoTEC plus VMW 26CS/1-5 Cf boiler

Condensing boiler · New equipmentVaillant ecoTEC plus VMW 26CS/1-5 Cf

Vaillant ecoTEC plus VMW 26CS/1-5 Cf boiler

VAT includedIn stock

The ecoTEC plus VMW 26CS/1-5 Cf combines a heating range of 3.0 to 19.8 kW at 80/60 °C with 25.7 kW for domestic hot water. Its specific flow rate is 12.3 l/min at ΔT 30 K. It is the lowest heating power option among these three ecoTEC plus models, maintaining the same dimensions of 720 x 440 x 348 mm. With sensoHOME radio. Installation not included. VAT and mainland shipping included.

Heating power (80/60 °C): 3.0-19.8 kW
Specific flow rate for domestic hot water (ΔT 30 K): 12.3 l/min
Dimensions (height x width x depth): 720 x 440 x 348 mm

Condensing boiler

The model, at a glance

Vaillant ecoTEC plus VMW 26CS: heating 3.0-19.8 kW at 80/60 °C, domestic hot water 25.7 kW and specific flow rate 12.3 l/min at ΔT 30 K.

Heating power (80/60 °C): 3.0-19.8 kW
Specific flow rate for domestic hot water (ΔT 30 K): 12.3 l/min
Dimensions (height x width x depth): 720 x 440 x 348 mm

Read the full description and what it includes.

The 26 in the name is not the maximum heating power: this version delivers up to 19.8 kW at 80/60 °C and 21.7 kW at 50/30 °C. The minimum of 3.0 kW at 80/60 °C is important in homes with moderate demand and during mild days. It helps to compare the equipment without choosing solely based on the domestic hot water figure.

For domestic hot water, it has micro-accumulation and 25.7 kW. Vaillant targets this version for bathrooms, toilets, and kitchens; this distribution does not mean opening all points at the same time. The specific flow rate of 12.3 l/min at ΔT 30 K and the limiter of 8.7 l/min describe different magnitudes that must be checked against the actual temperature and consumption of the home.

The external dimensions are the same as in the VMW 32 and 36, but not their domestic hot water capacity. The installation requires front access and space for pipes and drainage. The myVAILLANT connection is optional; the connectivity module should not be assumed to be included, nor should micro-accumulation be confused with a large capacity tank.

What is included in the purchase?

With sensoHOME radio. 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

Technical data of Vaillant ecoTEC plus VMW 26CS/1-5 Cf boiler

Brand: Vaillant
Model: Vaillant ecoTEC plus VMW 26CS/1-5 Cf boiler
Status: New
Supply scope: With sensoHOME radio. Installation not included.
Shipping: Included in mainland Spain. Please confirm the deadline.
Commercial reference: 8000014271

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): 3.0-19.8 kW
Heating
Heating power G20 (50/30 °C): 3.4-21.7 kW
Heating
Heating thermal load G20 (Hi): 3.2-20.4 kW
Heating
Adjustable flow temperature: 30-80 °C
Heating
Maximum heating pressure: 3 bar
Heating
Maximum power DHW G20: 25.7 kW
Hot water
Nominal thermal load DHW G20 (Hi): 26.5 kW
Hot water
Specific flow rate D (ΔT 30 K, EN 13203-1): 12.3 l/min
Hot water
Declared domestic hot water flow rate (ΔT 25 K): 14.8 l/min
Hot water
Minimum starting flow rate: 2 l/min
Hot water
Domestic hot water flow limiter: 8.7 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
Heating energy class: A
Energy and control
Energy class of domestic hot water: A
Energy and control
Sanitary profile: XL
Energy and control
Standby power consumption: Less than 2 W
Energy and control
myVAILLANT connectivity: Optional Plug & Play
Energy and control
Dimensions (height x width x depth): 720 x 440 x 348 mm
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
Superior distance with 60/100 outlet: 165 or 248 mm, according to the installation plan
Dimensions and installation
Higher distance with outlet 80/80: 220 mm
Dimensions and installation
Maximum distance with outlet 80/125: 276 mm
Dimensions and installation
Natural gas connection pressure G20: 20 mbar
Gas

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: condensing boilers 8000014271

Does the ecoTEC plus VMW 26CS work for a 90 m² house?

It can be assessed whether the calculated load fits within its range of 3.0-19.8 kW at 80/60 °C. For example, 90 m² with assumed losses of 80 W/m² would require 7.2 kW; this is an illustrative calculation, not a surface approved by Vaillant. The minimum of 3 kW is also important: if the dwelling requires less, the unit may operate in cycles. Insulation, climate, ventilation, and emitters must be taken into account before choosing this power.

Does the VMW 26CS allow for two simultaneous showers?

It cannot be guaranteed solely by its power. Two showers at 8 l/min would consume 16 l/min; with an inlet temperature of 10 °C and usage at 40 °C, they require a temperature rise of 30 K. The declared specific flow rate is 12.3 l/min at ΔT 30 K. This falls short of that example of simultaneous consumption. Furthermore, the manual indicates a limiter of 8.7 l/min for domestic hot water: specific flow rate, hot water output, and mixed flow rate of the shower are not the same. It is necessary to measure the network pressure and flow rate, inlet temperature, and consumption of the showers. The limiter should not be removed or modified to achieve the advertised performance.

Does the ecoTEC plus VMW 26CS have a storage tank for showers?

It is a mixed model with micro-accumulation, not the VMI variant with accumulation. Micro-accumulation improves the initial response, but it does not provide a reserve of tens of liters to maintain multiple demands. For the VMW 26CS, its domestic hot water capacity of 25.7 kW and the flow rate under usage conditions should be evaluated. If you need a hot water reserve, a compatible storage unit or system must be explicitly selected; it should not be assumed in this boiler.

What cabinet does the Vaillant VMW 26CS need?

The body measures 720 mm in height, 440 mm in width, and 348 mm in depth. The manual also requires 5 mm on each side, 180 mm below, and 500 mm of front access. Above, it needs 165 or 248 mm with a 60/100 outlet according to the plan, 220 mm with an 80/80, or 276 mm with an 80/125. These are not the measurements of a closed cabinet fitted to the unit: access, connections, and the authorized discharge for installation must be maintained.

What differentiates the VMW 26CS from the other ecoTEC plus 26, 32, and 36?

The three occupy 720 x 440 x 348 mm. The 26 offers a maximum heating output of 19.8 kW at 80/60 °C and 12.3 l/min specific at ΔT 30 K; the 32, 24.8 kW and 15.2 l/min; the 36, 29.8 kW and 17.0 l/min. The VMW 26CS has the lowest minimum heating output of the three, 3.0 kW. Choose based on thermal demand and domestic hot water consumption, not assuming that all include the same accessories.

Do the 14.8 l/min and 12.3 l/min of the VMW 26CS contradict each other?

No: 14.8 l/min is the published flow rate with ΔT 25 K and 12.3 l/min is the specific D from the manual with ΔT 30 K according to EN 13203-1. For example, changing water from 15 °C to water at 40 °C requires 25 K, while from 10 °C to 40 °C requires 30 K. The more each liter needs to be heated, the lower the available thermal flow rate. None of these values should be confused with the limiter of 8.7 l/min or used without checking the actual temperature.

Does the price include installation and shipping?

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