Boilers Gazda brand
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Our boilers are designed to be integrated into heating systems - both individual and combination. They can be installed in parallel or in series with existing gas or solid fuel boilers and can also be used to heat water in indirect heating tanks. The boiler is designed to pass alternating current through the heat transfer medium between the electrodes, which converts the electrical energy into thermal energy. Particular attention must be paid to the electrical conductivity of the heat transfer medium for optimum boiler operation. It must be understood that issues relating to changes in electrical conductivity with an electrode boiler are not a problem if installed correctly. One solution is to install a heat exchanger in parallel with the electrode boiler or to connect a KROS seven-bridge thermostat which enables regulation of the current intensity when the electrode boiler is in operation. In this way, the influence of the conductivity of the water on the operation of the system is negligible.
Single-phase electrode boilers GAZDA are covered with polymer material on the outside. Thus, there is no metal conductive part that can be touched by a person when the boiler is switched on. And the boiler drum is not in any way in contact with walls and ground. In this regard, the boiler works perfectly well in the electrical network when the RCD is switched on.
Electrode single-phase boilers
Electrode three-phase boilers
Electrode boilers possess a unique characteristic: they tend to be incompatible with Residual Current Devices (RCDs). This incompatibility arises because electrode boilers heat by channeling electric current through the coolant (typically water). Furthermore, the boiler's body is linked to both the earthing and neutral cables. An RCD, even when the earthing cable is improperly disconnected, interprets this setup as a current leakage, causing it to trip upon the boiler's activation. While it's crucial to connect these boilers to a ground loop, doing so might result in RCD tripping. To circumvent this, one may consider using three-phase wires and neutral to connect before the RCD.
GAZDA's single-phase electrode boilers are externally coated with a polymer layer, ensuring that no conductive metallic section is exposed. This design, combined with the fact that the boiler drum remains isolated from the walls and the ground, ensures the boiler's seamless operation in an electric network with an activated RCD.
If you're considering integrating an electrode boiler into a three-phase network equipped with an RCD, consider the following solution: Purchase three single-phase GAZDA boilers. For optimal functionality, either parallelly align or cascade them within the heating system. Then, connect these three boilers to the three-phase network, ensuring each boiler links to its distinct phase. This configuration means each boiler has its individual phase wire.
Concerning the neutral or "zero" wire: the trio of boilers will utilize a shared neutral wire. Consequently, this wire's capacity must be substantial enough to handle the cumulative current of all three boilers. As an illustrative example, if every boiler has a maximum current of 16A, the shared neutral wire should have a rating of at least 3x16A, equating to 48A.
For safety, each boiler could be equipped with a distinct RCD, or a singular RCD can manage the combined current of all units. If you opt for a shared neutral wire for all three boilers, its thickness should exceed that of each phase wire due to its role in transmitting the collective current. For instance, if each boiler uses 16A and the phase wire is 2.5mm^2, the neutral wire might need a thickness of 6mm^2 or more, contingent upon permissible loads and wire length.