ALUMINUM ELECTRIC -
HOLDING FURNACE
EH-A SERIES
The EH-A Series electric holding furnace features a pneumatic cover for easy maintenance access. This furnace features special state-of-the-art high efficiency heating elements. The lining is cast out of premium quality, high heat durable refractory with a secondary layer of refractory fiberboard. Like all our Dynamo furnaces, the EM-A Series is controlled by a PLC and a color HMI touch screen which optimizes performance and efficiency.
TECHNICAL OVERVIEW
The EH‑A Series is engineered to maintain aluminum at precise holding temperatures for extended periods, ensuring a clean, stable, and ready‑to‑pour molten metal supply. Its high‑efficiency immersion heaters deliver direct thermal transfer into the melt, reducing heat‑up time and minimizing energy loss. A pneumatic cover reduces heat escape and simplifies access for operators, while the furnace’s heavy‑duty refractory lining provides excellent insulation and long service life. With PLC‑based controls and a color HMI interface, operators benefit from precise temperature regulation, real‑time monitoring, and consistent holding performance. The EH‑A Series is ideal for foundries and die‑casting plants that demand metallurgical stability, low oxidation, and dependable molten metal availability.
Electric holding furnaces offer significant advantages in melt cleanliness, temperature accuracy, and operating efficiency. The EH‑A Series produces zero combustion byproducts, eliminating the oxidation, hydrogen pickup, and contamination risks associated with gas‑fired systems. Immersion heaters provide superior heat‑transfer efficiency, reducing energy consumption and improving temperature uniformity throughout the melt. With no burners, fuel trains, or combustion‑air systems, maintenance requirements are dramatically lower. For facilities seeking clean holding, precise temperature control, and long‑term cost savings, the EH‑A Series provides a highly efficient and environmentally friendly alternative to gas‑fired holding furnaces.
The EH‑A Series combines advanced electric heating technology with robust industrial construction to deliver exceptional holding performance. Its premium‑grade immersion heaters use high‑conductivity ceramic cores and Sialon‑type protective sheaths for long service life and reliable heat transfer. The furnace lining is cast from high‑heat‑durable refractory backed by a secondary fiberboard layer for maximum insulation. A pneumatic cover improves energy efficiency and simplifies maintenance access. The integrated PLC and HMI system provides precise temperature control, diagnostics, and user‑friendly operation. With its clean heating method, low maintenance requirements, and excellent thermal stability, the EH‑A Series is a dependable holding solution for aluminum casting operations of all sizes.
HIGH QUALITY IMMERSION HEATERS
Superior Quality and Long Life.
Our immersion heaters are made out of a very high grade high heat conductive ceramic which is covered with an external Sialon type ceramic sheath. These heaters can be used for aluminum, zinc or magnesium. They feature 100% efficiency, a precise temperature control, a good uniform bath temperature and help to preserve the quality of the aluminium.
EASY TO OPERATE INTERFACE
Greater Control - Means Greater Efficiency.
Our EH-A Series holding furnaces feature state-of-the-art PLC control with large color HMI screens with easy-to-read graphics - all at no extra charge. See in real time all furnace functions and change any setting on the fly. Now that's control.
CHOOSE YOUR CONTROL SYSTEM
We Give You Options of PLC & HMI.
Select the control system that is best for you and easiest for your maintenance team.
HIGHEST RETURN ON INVESTMENT
We Give You More Furnace For Your Money.
To be competitive today’s economy requires that manufacturers run their operations more efficiently and cost effectively than ever before. We offer the highest ROI (return on investment) in the industry. Dynamo gives you high-quality products for a reasonable investment and with more features than any other company. Simply put, we give you the most for your money!
THICKER INSULATION
We Add Way More Insulation to Our Furnaces Than Most Manufacturers.
The result is even greater efficiency and a solid, sturdy construction which is hard to beat.
HIGH THERMAL EFFICIENCY BY DESIGN
We Add Multiple Layers of Insulation.
The result is excellent efficiency which means a furnace which not only burns less gas, but is actually not dangerous to touch.
HIGH QUALITY COMPONENTS
We Use Brand Name Components You Know and Already Use.
We use only the finest quality components that are open source and readily available locally in your area, or from our online parts store.
REMOTE SERVICE
We Can Remotely Troubleshoot Your Furnace from Our Facility.
Our EH-A Series holding furnaces include a Remote Connectivity Unit which allows our furnace technicians to remotely check the performance of the furnace, make any needed changes to the program or HMI, or to troubleshoot it directly from our service center. The customer is only required to connect the unit to the Internet via an Ethernet cable. We handle the rest.
INDUSTRY 4.0 REMOTE MONITORING
Remotely Monitor Your Furnace Performance From Any Device.
As an option, all our furnaces are available with Industry 4.0 remote performance monitoring units which feature a custom dashboard. You can not only monitor furnace performance, but you can be notified before an issue occurs. Included are condition based maintenance reminders and shift performance statistics. Minimize impact of emergencies and maximize furnace uptime, and productivity. See what is going on with the furnace and your production from any device, anywhere in the world.
FIVE STANDARD SIZES
Flexible Range of Applications.
Available from 3,300 lbs holding capacity to 6,600 lbs, the EH-A Series Holding furnaces allow for a wide range of applications.
| Item | US Standard (Al) | Metric Standard (Al) |
| Model | Hold | Hold |
| EH-A-3300 | 3300 lb | 1500 kg |
| EH-A-3900 | 3900 lb | 1800 kg |
| EH-A-4400 | 4400 lb | 2000 kg |
| EH-A-5500 | 5500 lb | 2500 kg |
| EH-A-6600 | 6600 lb | 3000 kg |
DO YOU NEED A DIFFERENT SIZE?
Let Us Make One for You.
Tell us your requirements and we will be glad to work with you to give you exactly what you need.
Applications For The EH-A Series Aluminum Holding Furnace
The EH‑A Series is engineered to maintain aluminum at precise holding temperatures for extended periods, making it ideal for continuous casting lines and multi‑station workflows. Its immersion heaters deliver uniform heat directly into the melt, preventing temperature drift and ensuring consistent metal fluidity. This stability improves casting quality, reduces scrap, and supports uninterrupted production throughout the shift.
Die‑casting operations require molten aluminum at tightly controlled temperatures to achieve consistent fill characteristics and reduce porosity. The EH‑A Series provides the thermal stability needed to support both high‑pressure die‑casting (HPDC) and low‑pressure die‑casting (LPDC) cells. Its clean electric heating eliminates combustion byproducts, ensuring a low‑oxidation melt that enhances die‑casting performance and part quality.
In facilities with multiple casting stations, the EH‑A Series serves as a centralized molten metal buffer, ensuring each workstation receives aluminum at the correct temperature. The furnace’s immersion‑heating system maintains uniform melt conditions even during peak demand, improving workflow efficiency and preventing production delays caused by temperature fluctuations or melt shortages.
Before aluminum is transferred to molds or casting machines, it must be held at a stable temperature to ensure proper fluidity and metallurgical consistency. The EH‑A Series provides a controlled environment for temperature conditioning after alloying, degassing, or fluxing. Its precise temperature control helps maintain alloy chemistry, reduce oxidation, and improve the mechanical properties of finished castings.
The EH‑A Series is well‑suited for foundries that rely on manual or ladle‑based casting processes. Its stationary design and consistent temperature control ensure that molten aluminum remains at optimal pouring temperature throughout the shift. This improves mold fill quality, reduces cold shuts, and enhances surface finish in gravity, sand, and permanent‑mold castings.
Electric holding furnaces are inherently energy‑efficient, and the EH‑A Series maximizes this advantage with immersion heaters that deliver heat directly into the melt. The pneumatic cover and high‑performance refractory lining minimize heat loss, reducing power consumption. For facilities seeking to lower operating costs while maintaining high melt quality, the EH‑A Series offers a highly economical solution.
Foundries that melt aluminum in batches benefit from the EH‑A Series as a reliable molten metal storage unit. After a batch is melted in a primary furnace, the EH‑A Series maintains the metal at temperature for hours, allowing operators to pour on demand. This is especially valuable for shift‑based production, where melt availability must remain consistent even during downtime or changeovers.
The EH‑A Series is ideal for facilities that require a dependable holding furnace with minimal maintenance requirements. With no burners, fuel trains, or combustion‑air systems, electric heating dramatically reduces routine service needs. The immersion heaters are designed for long service life, and the furnace’s robust refractory construction ensures excellent thermal performance. This makes the EH‑A Series a practical, reliable holding solution for small and medium aluminum casting operations.
Frequently Asked Questions About The EH-A Series Aluminum Holding Furnace
The EH‑A Series provides exceptionally clean and stable holding performance because it uses immersion electric heaters instead of combustion. With no burners, no flame, and no exhaust gases, the furnace eliminates oxidation and hydrogen pickup — two major contributors to porosity and melt degradation. Immersion heaters deliver direct heat transfer into the aluminum, improving energy efficiency and temperature uniformity. For facilities that prioritize melt cleanliness, low operating costs, and minimal maintenance, the EH‑A Series offers a clear advantage over gas‑fired holding furnaces.
Immersion heaters transfer heat directly into the molten aluminum, providing faster response times and superior thermal uniformity compared to radiant or burner‑based systems. This direct heating method minimizes temperature gradients, reduces dross formation, and maintains consistent melt fluidity throughout the holding cycle. The EH‑A Series uses high‑quality ceramic‑core heaters with protective sheaths designed for long service life, ensuring reliable, stable performance in demanding foundry environments.
Yes — the EH‑A Series is designed to support a wide range of aluminum casting processes. Its precise temperature control and clean electric heating make it ideal for high‑pressure die‑casting (HPDC), low‑pressure die‑casting (LPDC), gravity casting, sand casting, and permanent‑mold casting. By maintaining aluminum at a stable holding temperature, the furnace improves mold fill characteristics, reduces casting defects, and ensures consistent metallurgical properties across production runs.
The EH‑A Series is compatible with all common foundry aluminum alloys, including A356, A380, 319, 6061, and other Al‑Si and Al‑Mg compositions. Its clean electric heating prevents contamination and overheating, helping preserve alloy chemistry and mechanical properties. Whether used for automotive components, structural castings, or general foundry work, the EH‑A Series maintains alloy integrity throughout the holding cycle.
Yes — EH‑A Series electric aluminum holding furnaces are available throughout the United States, Canada, and Mexico. Aluminum foundries, die‑casting plants, and industrial casting facilities rely on these furnaces for stable molten metal supply, low operating costs, and dependable long‑term performance. Regional availability ensures faster delivery, reliable technical support, and access to replacement parts. Furnaces can be configured with various capacities, immersion‑heater ratings, and control options to meet specific production requirements.
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