Neckar NGC 24/25 boiler
Condensing boiler · New equipmentNeckar NGC 24/25
New boiler Neckar Condensing boilers

Neckar NGC 24/25 boiler

Heating and hot water for everyday use, combined in a gas boiler.

Gas
Natural gas Convertible to propane
Wi-Fi
Compatible External Bosch control
Heating
3-24 kW 80/60 °C
Domestic hot water flow rate
11.9 l/min EN 625
Gas and Wi-Fi: compatibility and accessories

Gas and conversion: Natural gas G20 supply; adaptation to propane G31 with the kit and adjustments indicated by the manufacturer. Compatibility with butane G30 is not offered without explicit documentation for this version. The conversion and commissioning are the responsibility of a qualified professional; they are not included in the purchase. Source 1 ↗ Source 2 ↗

Wi-Fi and supply: Neckar certifies Wi-Fi connectivity and regulation through Bosch controls. The technical sheet does not specify the exact accessory nor does it confirm a module included with this reference; the compatible control must be specified before purchasing it. Source 1 ↗ Source 2 ↗

Description

Neckar combines home heating and hot water for taps and showers. When choosing it, both water usage and heating needs are important: a home with multiple showers running at the same time requires a different assessment.

If you are going to replace a boiler, compare the space, the connections, and the demand for hot water. The installer will be able to assess if this version fits in the home and what adaptations are needed.

Guide

What to check before installing this boiler

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

  1. Confirm the model and commercial reference, the type of gas, and the supply configuration in the manufacturer's documentation.
  2. Ask a qualified installer to assess the heating and domestic hot water demand; compare measured flow rates at the same temperature difference.
  3. Check dimensions, connections, flue gas evacuation, condensate drainage, and controls compatible with the existing installation.
  4. 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 Neckar NGC 24/25 boiler

Brand
Neckar
Model
Neckar NGC 24/25 boiler
Status
New
Supply scope
Equipment without installation; please confirm the accessories for this configuration.
Shipping
Included in mainland Spain. Please confirm the deadline.

Specifications and dimensions of the model

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

Heating power (80/60 °C)
3.0-24.0 kW
Heating
Heating power (50/30 °C)
3.3-24.7 kW
Heating
Heating power (40/30 °C)
3.3-24.8 kW
Heating
Heating load (Q)
3.2-24.6 kW
Heating
Thermal load range (Q)
3.2-25.5 kW
Heating
Declared domestic hot water power
25 kW
Hot water
Nominal thermal load for domestic hot water (QnW)
25.5 kW
Hot water
Specific flow rate for domestic hot water (EN 625)
11.9 l/min
Hot water
Declared energy efficiency
94 %
Efficiency and control
Heating energy class
A
Efficiency and control
Energy class of domestic hot water
A
Efficiency and control
Domestic hot water demand profile
XL
Efficiency and control
Acoustic power at minimum power
42 dBA
Efficiency and control
Acoustic power at maximum power
45 dBA
Efficiency and control
Control electronics
HMI 300
Efficiency and control
Dimensions (height x width x depth)
710 x 400 x 300 mm
Dimensions and components
Heating expansion vessel
6 l
Dimensions and components
Material of the heat exchanger
Aluminum/silicon
Dimensions and components
Supply gas
Natural gas; propane through conversion kit
Dimensions and components
Evacuation diameters indicated
60/100, 80/125 and 80/80 mm
Dimensions and components
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

Does the Neckar NGC 24/25 work for a house of 100 m²?
It has up to 24 kW of heating at 80/60 °C. For example, 100 m² with assumed losses of 80 W/m² would require 8 kW. This is not a surface certified by Neckar: insulation, climate, ventilation, and emitters change the actual load. Its minimum is 3 kW under those conditions; if the demand drops below that level, it may turn on and off in cycles. The NGC 24/30 has the same heating range, so choosing between the two especially depends on the domestic hot water consumption.
Can the NGC 24/25 supply water to two showers simultaneously?
Its specific flow rate is 11.9 l/min according to EN 625. Two showers of 8 l/min would consume a total of 16 l/min, but it is not correct to directly compare that mixed consumption at the taps with a normalized figure without checking the temperature. The technical sheet does not indicate the temperature difference along with the flow rate. To ensure simultaneous use, it is necessary to know the inlet temperature, the setpoint, the consumption of both showers, and the available pressure. The 24/30 increases the specific flow rate to 14.3 l/min, but that alone does not guarantee two showers.
Does the NGC 24/25 have a 6-liter domestic hot water tank?
No: the 6 liters correspond to the heating expansion vessel, not to a water reserve for showers. There is no accredited domestic hot water storage capacity for this version in the technical sheet, so it should not be sized considering that tank. If you need several prolonged usages, compare the domestic hot water flow rate and a storage solution specifically designed for that purpose.
Does the Neckar NGC 24/25 fit in the cabinet of my current boiler?
The body measures 710 mm in height, 400 mm in width, and 300 mm in depth. A space with those exact measurements is not enough: it needs room for connections, drainage, and maintenance. The panels can be removed to access the interior, and that access must remain available. Before replacing another boiler, also check the position of the pipes and the flue route; sharing dimensions does not guarantee a direct replacement.
What changes between the Neckar NGC 24/25 and the 24/30?
Both have heating from 3 to 24 kW at 80/60 °C and dimensions of 710 x 400 x 300 mm. The 24/25 specifies 25 kW of domestic hot water and 11.9 l/min according to EN 625; the 24/30, 30 kW and 14.3 l/min. The 24/30 increases the capacity for hot water, but not the maximum heating output or size. Therefore, it is advisable to decide based on domestic demand and not associate the number 30 with a larger house.
How much noise does the NGC 24/25 make and where is it advisable to place it?
The declared sound power level is 42 dBA at minimum power and 45 dBA at maximum. This is not the noise that will be measured at a specific distance: walls, vibrations, pipes, and location influence what is heard. When installing it near bedrooms or rest areas, it is advisable to check fixings, vibration transmission, and maintenance access with the installer.
Does the price include installation and shipping?
Includes VAT and shipping to mainland Spain. Installation and adaptations are valued separately. Check the contents of the supply before purchasing.
Shipping to the mainland included
New equipment
Separate installation
Informed purchase
Neckar NGC 24/25 boiler