DRY HEARTH MELTING FURNACES
GM-D SERIES
Our GM-D Series gas dry hearth melting furnace features a charging chamber that has no molten metal in it thus it reduces the dangers of metal splash and prevents temperature drop caused by the addition of cold ingots or scrap to the metal bath. The charging chamber is angled down and as the metal melts it runs into the metal bath. Like all our Dynamo furnaces, the GM-D Series is controlled by a PLC and a color HMI touch screen which runs a sophisticated program that optimizes performance, operation, and efficiency.
TECHNICAL OVERVIEW
The GM‑D Series dry hearth melting furnace is engineered for facilities that require safe, efficient, and contamination‑free aluminum melting. Its defining feature is the dry hearth charging chamber, which contains no molten metal, eliminating the risk of metal splash during charging and preventing temperature drops caused by adding cold ingots or scrap directly into the molten bath. As the charge melts on the angled hearth, clean molten aluminum flows into the bath without disturbing the metal already inside. This design significantly reduces oxidation, improves melt cleanliness, and enhances operator safety. With PLC‑based controls and a color HMI touchscreen, the GM‑D Series delivers optimized combustion, stable temperature control, and consistent melting performance for foundries and die‑casting plants seeking a safer, more efficient melting process.
Dry hearth furnaces offer major advantages in safety, melt quality, and scrap‑handling capability compared to traditional reverberatory or crucible furnaces. Because the charging chamber contains no molten metal, operators can load ingots, sows, and scrap without exposure to splash hazards or thermal shock. This also prevents sudden temperature drops in the molten bath, improving thermal stability and reducing fuel consumption. The GM‑D Series’ angled hearth allows aluminum to melt gradually and flow into the bath in a controlled manner, minimizing oxide formation and metal loss. This makes dry hearth technology especially effective for melting large, bulky, or contaminated scrap that would otherwise introduce impurities or excessive dross into the melt. With its robust insulation, high‑quality refractory lining, and automated control system, the GM‑D Series provides a safer, cleaner, and more efficient alternative to conventional melting systems.
The GM‑D Series combines advanced safety features with high‑efficiency melting performance. Its dry hearth charging chamber eliminates molten‑metal contact during loading, while the angled hearth design ensures smooth metal flow into the bath. The furnace is equipped with a PLC‑controlled system and color HMI touchscreen that optimize burner performance, temperature stability, and overall efficiency. High‑quality cast refractory lining, thick insulation, and a durable steel shell ensure long service life and excellent thermal retention. Additional features — such as dual temperature control for melting and holding burners, large rear charging door, side maintenance access, and low metal burn‑off rates — make the GM‑D Series a reliable solution for foundries and die‑casting plants that prioritize safety, melt cleanliness, and operational efficiency.
ADVANTAGES OF DRY HEARTH
Safety and Efficiency.
The dry hearth charging chamber has no molten metal in it thus it reduces the dangers of metal splash. In addition, this design prevents temperature drop caused by the addition of cold ingots or scrap to the metal bath. The charging chamber is angled down and as the metal melts it runs into the metal bath. Less drop in temperature, means a more consistent temperature, which translates to better quality castings and less scrap.
TWO CHAMBERS
Separate Melting and Holding Chambers.
Low end dry hearth furnaces have only one chamber. Our dry hearth furnace has two separate chambers with two burners, two air blowers, and two independent heating systems. Our two chamber dry hearth furnace produces substantially less oxides and drastically reduces temperature drops which result from charging the furnace. All this means a better quality melt and consistent temperature which are critical for high quality castings. Our dry hearth furnaces are ideal for melting ingots and remelting returns.
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!
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.
EASY TO OPERATE INTERFACE
Greater Control - Means Greater Efficiency.
The GM-E Series Mini stack melting 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.
DUAL AIR BLOWERS
Two are Better Than One.
Using double air blowers gives us more flexibility and precision in the amount of air available for the melting and holding chambers at any given time. When balanced correctly they increase the efficiency of the furnace and reduce running costs.
VFD DRIVE BLOWER MOTORS
Better Efficiency and Lower Operating Cost.
Lots of air without control wastes a significant amount of energy. We use VFD Drives combined with Premium Inverter Duty Motors to give you greater RPM only when it is needed. All this translates into greater efficiency, lower operating costs, quieter operation, soft start and longer motor life. The advantage is clear. This is just one of the many ways we use to increase furnace efficiency, and reduce long term operating costs.
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.
LARGE SIDE CLEANOUT DOOR
Easy Access to the Entire Interior of the Furnace with no Dead Spots.
The key to long furnace service lifetime is regular cleaning. However, cleaning is hard through a small maintenance door. We have made our side cleanout door extra wide to facilitate and encourage easy, regular cleaning.
CERAMIC ALUMINUM DROSS FILTRATION
Comes Standard with All Models and Keeps Your Aluminum Clean.
Our ceramic foam filter can effectively remove and absorb large or small impurities in molten aluminum, improves the surface quality, and microstructure effectiveness. Thermal shock resistance, this ceramic filter improves purity and improves erosion resistance molten aluminum.
ELECTRIC CHARGING DOOR
Simplfy and Speed Up Charging the Furnace.
Our standard door is a manual hinged. However, you can add this electric drive charging door to increase speed and productivity.
REMOTE SERVICE
We Can Remotely Troubleshoot Your Furnace from Our Facility.
Our GM-D Series dry hearth melting furnace includes 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.
SIX STANDARD SIZES
Flexible Range of Applications.
Available from a melting rate of 330 lbs to 1650 lbs per hour, the GM-D Series dry hearth melting furnaces allow for a wide range of applications.
| Standard | US / Imperial (Al) | Metric (Al) | ||
| Model | Holding | Melting/h * | Holding | Melting/h * |
| GM-D-1100 | 1100 lb | 330 lb | 500 kg | 150 kg |
| GM-D-1760 | 1760 lb | 550 lb | 800 kg | 250 kg |
| GM-D-2200 | 2200 lb | 660 lb | 1000 kg | 300 kg |
| GM-D-2600 | 2600 lb | 880 lb | 1200 kg | 400 kg |
| GM-D-3300 | 3300 lb | 1100 lb | 1500 kg | 500 kg |
| GM-D-4400 | 4400 lb | 1650 lb | 2000 kg | 750 kg |
Applications For The GM-D Series Aluminum Dry Hearth Melting Furnace
The GM‑D Series is ideal for foundries that prioritize operator safety and melt stability. Because the dry hearth contains no molten metal, operators can charge ingots, sows, and scrap without exposure to splash hazards. This eliminates one of the most dangerous aspects of aluminum melting and allows for safer, more controlled loading. As the charge melts gradually on the hearth, molten aluminum flows into the bath without disturbing the existing metal, maintaining temperature stability and reducing thermal shock. This makes the GM‑D Series a preferred solution for facilities with strict safety protocols or limited operator experience.
Dry hearth furnaces excel at processing scrap that would be difficult or unsafe to charge directly into molten aluminum. The GM‑D Series can handle large, irregular, or lightly contaminated scrap because the material melts on the hearth rather than being submerged in the bath. This prevents violent reactions, reduces oxidation, and minimizes the introduction of impurities into the melt. Foundries and recycling operations benefit from lower dross formation, improved metal recovery, and the ability to use lower‑cost feedstock without compromising melt quality.
The GM‑D Series provides a stable, continuous supply of molten aluminum for die‑casting machines, gravity casting lines, and ladle‑pouring stations. Its dual‑burner system — one for melting and one for holding — ensures precise temperature control throughout the process. Because the dry hearth prevents temperature drops during charging, the furnace maintains consistent melt conditions even during long production cycles. This reliability is essential for automotive, industrial, and high‑volume casting operations that depend on uninterrupted metal flow and consistent metallurgical quality.
With its stable molten bath and controlled melting environment, the GM‑D Series is well‑suited for alloy preparation and melt treatment. Operators can add alloying elements, perform degassing, and maintain precise temperature control before transferring metal to casting equipment. The gradual melting process on the hearth reduces oxide formation and improves alloy uniformity. This makes the GM‑D Series an excellent choice for producing high‑performance aluminum alloys used in automotive, aerospace, and industrial applications where metallurgical consistency is critical.
The GM‑D Series is designed for facilities focused on reducing fuel consumption and improving operational efficiency. Its closed‑door melting process minimizes heat loss, while the angled hearth design ensures efficient heat transfer to the charge. Because cold material is not added directly into the molten bath, the furnace avoids the temperature drops that typically increase fuel usage in conventional systems. Combined with thick insulation, high‑quality refractory lining, and PLC‑optimized burner control, the GM‑D Series delivers lower operating costs and improved energy efficiency.
The GM‑D Series produces exceptionally clean molten aluminum thanks to its low‑turbulence melting process and reduced oxidation environment. Molten metal flows from the hearth into the bath without disturbing the surface, minimizing oxide entrainment. When tapped or transferred, the metal maintains its cleanliness, making it ideal for gravity casting, permanent‑mold casting, and automated casting systems. Facilities benefit from fewer casting defects, reduced scrap rates, and improved product consistency.
The GM‑D Series is engineered for continuous operation, making it ideal for plants that run extended production cycles. Its heavy‑duty refractory lining, robust steel shell, and PLC‑controlled burner system ensure stable performance with minimal maintenance interruptions. The furnace’s ability to maintain consistent melt quality over long periods enhances overall process stability and production efficiency. This reliability is especially valuable for automotive casting plants, large foundries, and high‑volume aluminum processors.
Foundries with multiple casting lines often require a centralized melting system capable of feeding several processes simultaneously. The GM‑D Series provides the melting capacity, holding stability, and automation needed to serve multiple ladle‑pouring stations or casting machines. Optional metal‑handling accessories — such as tap‑out spouts, launders, and transfer systems — allow seamless integration into complex production layouts. This makes the GM‑D Series a versatile solution for facilities seeking centralized melt management with high efficiency and clean metal output.
Frequently Asked Questions About The GM-D Series Aluminum Dry Hearth Melting Furnace
A dry hearth furnace provides major safety and melt‑quality advantages compared to traditional reverberatory or crucible furnaces. Because the charging chamber contains no molten metal, operators can load ingots, sows, and scrap without splash hazards or thermal shock. The charge melts gradually on the hearth and flows into the molten bath in a controlled manner, preventing sudden temperature drops and reducing oxidation. This results in cleaner metal, lower dross formation, and more stable furnace operation — making the GM‑D Series ideal for facilities prioritizing safety, melt cleanliness, and energy efficiency.
The GM‑D Series is engineered to melt a wide range of aluminum feedstock, including ingots, sows, bulky scrap, runners, gates, and mixed returns. Its dry hearth design is especially effective for processing large or irregular scrap that would be unsafe or inefficient to charge directly into molten aluminum. Because the material melts on the hearth rather than being submerged, impurities and contaminants have less impact on melt quality. This flexibility makes the GM‑D Series a strong fit for foundries and recycling operations that rely on both primary and secondary aluminum sources.
The GM‑D Series improves melt quality by separating the charging zone from the molten bath. Cold material melts on the angled hearth, allowing clean aluminum to flow into the bath without disturbing the surface. This prevents turbulence, reduces oxide entrainment, and minimizes dross formation. The closed‑door melting process and optimized burner system maintain a stable, low‑oxygen environment, further reducing oxidation. Combined with precise temperature control and high‑quality refractory insulation, the GM‑D Series consistently produces clean, stable molten aluminum suitable for demanding casting applications.
Yes — the GM‑D Series is designed for continuous, high‑volume aluminum melting. Its dual‑burner configuration (melting and holding) ensures stable temperature control throughout long production cycles. Because charging does not disturb the molten bath, the furnace maintains consistent melt conditions even during frequent loading. This makes the GM‑D Series ideal for die‑casting plants, gravity casting lines, and foundries that require a reliable, uninterrupted supply of molten aluminum. Its durable refractory lining and PLC‑based control system support long operating life with minimal downtime.
Yes — GM‑D Series aluminum dry hearth melting furnaces are available throughout the United States, Canada, and Mexico. Foundries, die‑casting plants, and aluminum processors across North America rely on these furnaces for safer charging, cleaner melt quality, and reduced fuel consumption. Regional availability ensures faster delivery, dependable technical support, and access to replacement parts. Units can be configured with various capacities, burner systems, automation packages, and metal‑handling options to meet specific production requirements.
RELATED PROJECTS & POSTS
Dry-Hearth Aluminum Gas Melting Furnace Design & Assembly Project
Read the process of engineering and assembly of two dry-hearth aluminum gas melting furnaces for a foundry in
Arkansas, USA.
Advantages of a Dry Hearth Furnace Design
Dry-hearth Aluminum Gas Melting Furnace Testing & Pre-Commissioning Project
After the completion of two dry-hearth furnaces and before shipment, our engineers run numerous tests and pre-commissioning operations to ensure the flawless quality is delivered to our customer in Arkansas, USA.
Energy Efficiency & Environmental Impact of Industrial Furnaces
Explore the technologies, strategies, and operational practices that help facilities reduce energy consumption, comply with environmental regulations, and operate more sustainably.
Industrial Furnace Types Guide: A Buyer’s Handbook
Read our guide on selecting the right Industrial furnace type to learn about the major furnace categories used across industry, how each system works, where it excels, and how to evaluate it for your operation.
Metal Melting Furnaces: A Complete Technical Guide
Metal melting is one of the most energy‑intensive and technically demanding operations in manufacturing. This guide on metal melting furnaces explores the major furnace technologies used for non‑ferrous melting, explaining how each system works, where it excels, and how to evaluate it for your application.