Product Overview & Application Area
The GEMA MDC 230 Bundle Module + Heating Rod SEHP3 3.0 kW 230 V combines an MDC heating module for central heating systems with a matching electric heating cartridge. The combination is intended for the additional introduction of electric heat into the heating circuit and can support existing heat generators in open or closed central heating systems.
The bundle is suitable for applications where heating water is to be electrically reheated, an auxiliary heater is to be integrated, or excess electricity from photovoltaic systems is to be used as heat in the heating circuit. The design does not replace proper system planning, heat load calculation, or electrical sizing.
Technology & Equipment
The MDC 230 module is an electric flow heater or a heating module for central heating systems. It features a steel tank with a raw steel interior, powder-coated exterior, 50 mm polyurethane foam thermal insulation, and a heating circuit connection stub with internal thread G 1 1/4".
The SEHP3 heating rod operates at 3.0 kW on 230 V~ / 50 Hz. The heating elements are made of Incoloy 825. The heating rod features an infinitely adjustable thermostat, protection rating IP44, and a non-automatic temperature limiter that interrupts the circuit in the event of overheating.
Everyday Benefits
The combination of module and heating rod provides a compact electric auxiliary heat source directly in the heating circuit. This allows an existing central heating system to be specifically supplemented without having to assemble a matching module and heating rod individually.
For operators, the clear technical assignment is particularly helpful: The MDC 230 provides the integration into the heating circuit, while the SEHP3 heating rod delivers the electric heat output of 3.0 kW. This makes it easy to verify power, voltage, connection, and application area.
System Integration & Compatibility
The heating module is integrated into a parallel heating circuit on the flow or return line of the main heat source. The medium is water or a suitable glycol mixture with a maximum concentration of 50%.
For operation, the minimum flow rate must be ensured. At 3.0 kW heating output, 171 l/h is required, corresponding to approx. 2.85 l/min. An additional circulation pump must be provided and connected in parallel to the heating cartridge. A safety valve with an opening pressure of 1.0 MPa is required.
Technical data at a glance
The following information refers to the specific bundle consisting of the MDC module and the matching electric heating cartridge.
| Nominal output | 3.0 kW |
| Power consumption | 3,000 W |
| Voltage | 230 V~ |
| Frequency | 50 Hz |
| Phases | 1 |
| Heating cartridge connection module | Female thread G 1 1/2" |
| Module connection heating circuit | Female thread G 1 1/4" |
| Installation length heating rod | 360 mm |
| Unheated area / S dimension | 60 mm |
| Heating rod temperature range | approx. 23-75 °C ±5 |
| Safety temperature limiter | approx. 85 °C |
| Heating rod protection rating | IP44 |
| Heating rod material | Incoloy 825 |
| Minimum flow rate | 171 l/h, corresponding to approx. 2.85 l/min |
| Maximum operating pressure | 10 bar |
| Maximum operating temperature of module | 90 °C |
| Length of MDC 230 module | 500 mm |
| Insulation of MDC module | 50 mm polyurethane foam |
Installation
The hydraulic connection is made in a parallel heating circuit on the flow or return line of the main heat source. For the MDC 230, horizontal installation is conservatively described. Pipe routing, filling, and venting must be carried out in such a way that the heating module is reliably filled with the medium.
Installation, electrical connection, and commissioning may only be carried out by qualified specialists. Before switching on the power supply, the system and heating module must be completely filled, vented, and checked for leaks. Fusing, cable cross-section, residual current protection, and switching devices must be properly designed on site.
Notes
Dry running is not permitted. The electrical supply may only be established once the device and system are completely filled with water and vented. The device may only be operated if the minimum flow rate is ensured and the additional circulation pump is active.
The safety valve is required and must not be isolated from the device by shut-off valves. The housing of the heating cartridge must not be covered or thermally insulated. The product data is intended for technical orientation and does not replace professional planning.
Scope of delivery
- MDC 230 module
- Matching GEMA heating rod / electric heating cartridge SEHP3, 3.0 kW, 230 V
