Vaillant eloBLOCK VE 6/14 EU III electric boiler 6 kW

Product detailed description

Vaillant eloBLOCK VE 6/14 EU III is a compact wall-mounted electric boiler with an output of 6 kW, designed primarily for smaller flats, cottages, cabins or well-insulated houses up to approx. 60 m². It is the smallest and most economical model in the entire eloBLOCK range we offer - an ideal choice where a gas connection is not available, where gas connection is not worthwhile due to the distance from the mains, or where the investor simply wants clean, maintenance-free and quiet heating without exhaust gases or a chimney.

The boiler is intended for installation into a heating circuit with radiators, underfloor heating or a combination of both, and comes with everything needed for immediate connection - a high-efficiency circulation pump, expansion vessel, safety valve, pressure gauge, thermometer and a digital control and information system on the front panel. Thanks to this, installation is fast and does not require purchasing any additional components for the primary circuit.

Technical characteristics

The VE 6/14 model belongs to the Vaillant eloBLOCK VE. /14 EU III range of electric boilers, which is manufactured in power ratings from 6 to 28 kW - you choose exactly according to the heat loss of your building, so you don't pay for power you won't actually use, nor risk undersizing the heat source.

• Rated heating output - 6 kW, with the option of partial load at 1/2 or 1/3 of output depending on current heat demand
• Electrical connection - 400 V / 50 Hz, three-phase connection, 10 A fuse protection
• Dimensions (H × W × D) - 740 × 410 × 310 mm (height × width × depth)
• Weight - approximately 32.6 kg
• Water volume in the boiler - 10 litres in the boiler body
• Expansion vessel - 7 litres, pressure 0.75 bar
• Maximum operating pressure - 3 bar
• Maximum settable heating water temperature - 70 °C
• Heating circuit connections - 3/4" for the heating circuit as well as for a possible domestic hot water cylinder connection
• Protection rating - IP40
• Space heating energy class - D (space heating)
• Number of heating elements - 1 (with partial output switching)
• Integrated accessories - high-efficiency circulation pump, expansion vessel, safety valve, pressure gauge, thermometer, flow temperature sensor, pressure sensor

The control electronics of the VE 6/14 boiler continuously evaluate the flow temperature and system pressure and switch between individual output stages of the heating element according to current demand - this means the boiler does not run unnecessarily at full power when half or one-third output is sufficient, which saves electricity even during long-term operation. The boiler is intended exclusively for a closed heating circuit (not for instantaneous domestic water heating) - however, in combination with an indirectly heated domestic hot water cylinder, it can fully provide hot water heating for the household as well.

Installation and electrical connection

The VE 6/14 model connects to a three-phase 400 V/50 Hz supply, and the supply must be protected by a 10 A circuit breaker - the exact dimensioning of the supply cable and the type of circuit breaker (characteristic B or C depending on the distribution network) must be designed and carried out by a qualified electrician with a valid inspection report, as this is an appliance with high current draw. We recommend consulting the dimensioning of the main protective element of the house (main circuit breaker before the electricity meter) with your electricity distributor in advance, especially if you plan to combine the boiler with other large appliances (heat pump, cooker, electric vehicle charger).

When installing, it is also worth considering the following points:

• Using a low night tariff (dual tariff) - if the house has a dual-tariff electricity meter with a relay, the boiler can use cheaper night-time electricity to heat the building's thermal mass or the domestic hot water cylinder.
• Placing the boiler as close as possible to the heating circuit distribution to minimise heat losses in the piping and the length of the electrical supply.
• Ensuring sufficient space around the boiler for service access and ventilation of the boiler room.
• Adding a room thermostat or a Vaillant weather-compensated control (e.g. sensoCOMFORT VRC 720 or VRT 350f) for more precise and economical temperature control in individual rooms.

Use, compatibility and control

The VE 6/14 electric boiler is fully compatible with common heating systems - radiators (panel and ladder types), underfloor heating, or a combination of both via a mixing station. The boiler can be supplemented with an indirectly heated hot water cylinder (for example, the VIH or uniSTOR series) to create a complete heat and hot water source for the household. The control system can be extended with room thermostats, weekly programmers, or modern weather-compensated control with a mobile app output, which evaluates the outdoor temperature and regulates the heating water temperature accordingly - this significantly increases comfort as well as operating savings.

If you are not sure whether 6 kW of output will be sufficient for your building, our range also includes the higher-output eloBLOCK VE 14/14 model. Intermediate outputs VE 9/14 or VE 12/14 are also available, if your heat loss does not exactly match either of the extreme outputs.

The boiler is also suitable as:

• Main heat source where there is no gas connection or where burning solid fuels is prohibited in the given location.
• Supplementary/backup source alongside a heat pump, especially in a bivalent setup at very low outdoor temperatures.
• Temporary solution during renovation, until a gas connection or other permanent source is implemented.
• Solution for recreational properties - cottages and cabins, where consumption occurs only occasionally and investing in a gas connection would not be worthwhile.

Maintenance and service

The eloBLOCK VE 6/14 electric boiler is a maintenance-free heat source compared to gas condensing boilers or solid fuel boilers - it contains no burner, flue or chimney that would need regular cleaning. Nevertheless, we recommend:

• Having a service inspection carried out once a year by a qualified technician - checking the tightness of the circuit, the function of the safety valve, the pressure in the expansion vessel, and the condition of the heating element.
• Monitoring the heating water pressure on the boiler's pressure gauge and, if it drops below the recommended value, topping up the system according to the instructions in the operating manual.
• In areas with harder water, consider treating the fill water (softening/demineralisation), which extends the service life of the heating element and reduces the risk of scale buildup.
• Keeping the space around the boiler clear and not covering the ventilation openings of the casing.

Thanks to their simple design and the absence of a combustion process, electric boilers in the eloBLOCK range typically have a long service life and low failure rate, which, combined with a 2-year warranty, represents a safe and long-term investment.

Why choose the eloBLOCK VE 6/14

Vaillant is one of the most trusted heating technology brands in Europe, and the eloBLOCK range brings the same quality of workmanship to the electric boiler segment as you know from the ecoTEC gas condensing boilers. The VE 6/14 model with an output of 6 kW is the smallest and most economical model in the entire eloBLOCK range we offer, making it a smart choice for smaller flats, cottages, cabins or well-insulated houses up to approx. 60 m². The boiler arrives fully ready for connection, including the pump and all necessary accessories, so the electrician only needs to handle the connection to the electrical grid and the existing heating circuit.

When choosing the correct output, it is worth basing the decision on an actual calculation of the building's heat loss (or a designer's recommendation), not just on the approximate floor area - the quality of insulation, ceiling height, number and size of windows, and location all have a significant impact on the required output. If in doubt, we are happy to help you choose the right model from the entire eloBLOCK range and suggest suitable control equipment.

Comparison of the entire eloBLOCK VE. /14 EU III range

The VE 6/14 model you are currently viewing is highlighted in the table below along with the rest of the eloBLOCK range. The table serves as a quick reference if you are not completely sure whether the selected output is the right one for your building - all models have the same body dimensions and the same basic equipment (circulation pump, expansion vessel, safety valve), and differ in heating element output, weight, and required fuse protection.

Estimated operating costs

The exact operating consumption of an electric boiler is primarily determined by the specific building's heat loss, the quality of insulation, the set room temperature, and the length of the heating season - the following calculation is therefore only approximate and serves for a rough idea. Assuming a model scenario of approximately 1,300 hours of equivalent full-output operation during the heating season (typical for smaller flats, cottages, cabins or well-insulated houses up to approx. 60 m²), the annual consumption of the VE 6/14 model would reach approximately 7,800 kWh, which, at current electricity prices ranging from approx. €0.18 to €0.28/kWh (depending on tariff and supplier), represents estimated annual costs of approximately €1,404 - €2,184.

Actual consumption can be significantly reduced by using dual-tariff metering (shifting consumption to the cheaper night-time period), good building insulation, weather-compensated control based on outdoor temperature, and reasonable temperature setback settings during absence or at night. We recommend consulting a heating designer or energy auditor for a precise estimate of operating costs for your specific building.

Frequently asked questions