Vaillant eloBLOCK VE 24/14 EU III electric boiler 24 kW

Product detailed description

Vaillant eloBLOCK VE 24/14 EU III is a powerful wall-mounted electric boiler with an output of 24 kW, designed for larger family houses, two-generation houses or properties with a pool or extension up to approx. 230-240 m². It is the second most powerful model in the range, often chosen as a replacement for an older electric boiler with similar output, with sufficient power reserve even for more demanding heating seasons and lower outdoor temperatures, when a classic heat pump loses part of its output and efficiency.

The boiler is designed for installation into a heating circuit with radiators, underfloor heating or their combination, and comes with everything needed for immediate connection - a highly efficient circulation pump, expansion vessel, safety valve, pressure gauge, thermometer and a digital control and information system on the front panel. This makes installation fast and does not require purchasing any additional components for the primary circuit.

Technical characteristics

The VE 24/14 model belongs to the Vaillant eloBLOCK VE .. /14 EU III range of electric boilers, which is manufactured in power stages from 6 to 28 kW - you choose exactly according to the heat loss of your property, so you don't pay for output you won't actually use, nor risk undersizing the heat source.

• Rated heating output - 24 kW, with the option of partial load at 1/2 or 1/3 of output according to current heat demand
• Electrical connection - 400 V / 50 Hz, three-phase connection, 40 A fuse protection
• Dimensions (H × W × D) - 740 × 410 × 310 mm (height × width × depth)
• Weight - approximately 35.1 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 adjustable heating water temperature - 70 °C
• Heating circuit connections - 3/4" for the heating circuit and also for a possible DHW cylinder connection
• Protection rating - IP40
• Space heating energy efficiency class - D (space heating)
• Number of heating elements - 1 (with partial output switching)
• Integrated accessories - highly efficient circulation pump, expansion vessel, safety valve, pressure gauge, thermometer, flow temperature sensor, pressure sensor

The control electronics of the VE 24/14 boiler continuously evaluate the flow temperature and system pressure, and switch between individual output stages of the heating element according to current demand - this way the boiler doesn't operate unnecessarily at full power when half or a third of the output is sufficient, saving electricity even during long-term operation. The boiler is designed exclusively for a closed heating circuit (not for instantaneous domestic water heating) - however, in combination with an indirect DHW cylinder, it can also fully provide domestic hot water for the household.

Installation and electrical connection

The VE 24/14 model connects to a three-phase 400 V/50 Hz supply, and the supply must be protected by a 40 A circuit breaker - the exact cable dimension and type of circuit breaker (characteristic B or C, depending on the distribution network) must be designed and implemented by a qualified electrician with a valid inspection report, since this is an appliance with high current draw. We recommend consulting the sizing of the house's main protective device (main circuit breaker before the electricity meter) with the electricity distributor in advance, especially if you plan to combine the boiler with other high-consumption appliances (heat pump, cooker, electric vehicle charger).

When installing, we also recommend considering the following points:

• Using a low night-time tariff (dual tariff meter) - if the house has a dual-tariff electricity meter with a relay installed, the boiler can use cheaper night-time electricity to heat up the building's thermal mass or the DHW 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 Vaillant weather-compensated control (e.g. sensoCOMFORT VRC 720 or VRT 350f) for more precise and more economical temperature control in individual rooms.

Use, compatibility and control

The VE 24/14 electric boiler is fully compatible with common heating systems - radiators (panel and ladder-type), underfloor heating, or their combination using a mixing station. The boiler can be complemented with an indirect domestic hot water cylinder (for example the VIH or uniSTOR ranges), creating a complete source of heat and hot water for the household. Control 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 and operating savings.

If you are not sure whether an output of 24 kW will be sufficient for your property, our range also includes the higher-output eloBLOCK VE 28/14 model. Conversely, for smaller properties we recommend the eloBLOCK VE 21/14 model, which is sufficient for a smaller heated area at a lower purchase and operating price.

The boiler is also suitable as:

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

Maintenance and servicing

The eloBLOCK VE 24/14 electric boiler is a virtually maintenance-free heat source compared to gas condensing boilers or solid fuel boilers - it does not contain a burner, flue, or chimney that would need regular cleaning. Nevertheless, we recommend:

• Having an annual service inspection performed 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 topping up the system according to the instructions in the operating manual if the pressure drops below the recommended value.
• In areas with harder water, consider treating the fill water (softening/demineralisation), which extends the life of the heating element and reduces the risk of scale deposits.
• Keeping free space around the boiler and not covering the ventilation openings of the casing.

Thanks to their simple construction and the absence of a combustion process, the service life of eloBLOCK electric boilers is generally high and the failure rate low, which, combined with a 2-year warranty from the supplier WINTNER s.r.o., represents a safe and long-term investment.

Why choose the eloBLOCK VE 24/14

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 that you know from the ecoTEC gas condensing boilers. The VE 24/14 model with an output of 24 kW is the second most powerful model in the range, often chosen as a replacement for an older electric boiler of similar output, making it a well-considered choice for larger family houses, two-generation houses, or properties with a pool or extension up to approx. 230-240 m². The boiler arrives fully ready for connection, including the pump and all necessary accessories, so the electrician on site only needs to connect it to the power supply and to the existing heating circuit.

When choosing the correct output, it is worth basing the decision on an actual heat loss calculation for the property (or on 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 major impact on the required output. If in doubt, we are happy to help you choose the right model from the whole eloBLOCK range and suggest a suitable control system.

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

The VE 24/14 model you are currently viewing is highlighted in the table below, together with the rest of the eloBLOCK range. The table serves for a quick overview if you are not completely sure whether the selected output is the right one for your property - all models have the same body dimensions and the same basic equipment (circulation pump, expansion vessel, safety valve), differing in the output of the heating element, weight, and required fuse protection.

Approximate operating costs

The exact operating consumption of an electric boiler is always mainly determined by the heat loss of the specific property, 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 1700 hours of equivalent full-power operation during the heating season (typical for larger family houses, two-generation houses, or properties with a pool or extension up to approx. 230-240 m²), the annual consumption of the VE 24/14 model would reach approximately 40,800 kWh, which at current electricity prices ranging from approx. 0.18 - 0.28 €/kWh (depending on tariff and supplier) represents approximate annual costs of around 7,344 - 11,424 €.

Actual consumption can be significantly reduced by using dual-tariff metering with a night relay (shifting consumption to the cheaper night-time band), high-quality 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 an accurate estimate of operating costs for your specific property.

Frequently asked questions