Selecting the right induction melting furnace is one of the most important decisions for any jewelry manufacturer, refinery, bullion producer, laboratory, or precious metal recycling business. Buying a furnace that is too small limits production, while choosing an oversized furnace increases your initial investment and operating costs.
Whether you’re melting gold, silver, platinum, copper, brass, or other precious metals, selecting the appropriate furnace capacity ensures maximum productivity, energy efficiency, and return on investment.
A tunnel furnace is a continuous heating system widely used in precious metals manufacturing, especially for producing gold and silver bars with consistent quality and high throughput. It allows controlled, uniform heating as metal moves through different temperature zones on a conveyor or track system.
In this guide, we’ll explain how to choose between 1kg, 5kg, 10kg, 25kg, and 50kg induction furnaces, helping you make an informed investment.
Why Furnace Capacity Matters
The capacity of an induction furnace directly impacts:
- Daily production output
- Melting cycle time
- Electricity consumption
- Labour efficiency
- Production planning
- Expansion capability
- Overall operating cost
The right capacity should match not only your current production but also your expected business growth over the next 3–5 years.
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Factors to Consider Before Choosing Furnace Capacity
1. Daily Production Requirement
The first question to ask is:
How many kilograms of metal do you melt every day?
Your answer will largely determine the furnace size you need.
For example:
- 5–10 kg/day
- 30–50 kg/day
- 100 kg/day
- 300 kg/day
- 500+ kg/day
Higher daily production generally requires larger furnace capacities.
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2. Type of Metal
Different metals have different melting temperatures and densities.
Common applications include:
- Gold
- Silver
- Platinum
- Copper
- Brass
- Bronze
- Jewellery alloys
- Scrap recovery
Some businesses process multiple metals using interchangeable crucibles.
3. Number of Melting Cycles
Rather than focusing only on furnace size, calculate:
- Number of melts per shift
- Shift duration
- Production target
For example:
A 10kg furnace operating 20 cycles per day can produce approximately 200kg daily.
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4. Future Expansion
Many businesses purchase a furnace only for current demand.
However, production often doubles within a few years.
Choosing a slightly larger furnace can avoid future replacement costs.
1kg Induction Furnace
Best For
- Jewellery workshops
- Small manufacturers
- Research laboratories
- Design studios
- Educational institutes
Advantages
- Low investment
- Compact footprint
- Fast heating
- Low power consumption
- Easy installation
Typical Applications
- Sample melting
- Jewellery casting preparation
- Alloy development
- Prototype manufacturing
If you’re producing custom jewelry or operating a boutique workshop, a 1kg furnace is often sufficient.
5kg Induction Furnace
Best For
- Growing jewelry manufacturers
- Small bullion producers
- Goldsmiths
- Silver workshops
Benefits
- Higher productivity
- Better energy efficiency
- Suitable for continuous production
- Faster melting cycles
Ideal Daily Production
Approximately 30–80 kg/day, depending on cycle time.
This capacity is among the most popular choices for expanding jewelry businesses.
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10kg Induction Furnace
Best For
- Medium-sized jewelry factories
- Bullion manufacturers
- Refining plants
- Precious metal recyclers
Advantages
- Excellent production capacity
- Lower cost per kilogram melted
- Supports continuous operation
- Ideal for commercial manufacturing
Typical Applications
- Gold bar production
- Silver bar manufacturing
- Alloy preparation
- Investment casting
A 10kg furnace provides an excellent balance between investment and production efficiency.
25kg Induction Furnace
Best For
- Large jewelry factories
- Silver refineries
- Industrial manufacturers
- Continuous production facilities
Key Advantages
- High production rate
- Lower labour cost
- Reduced melting cycles
- Increased operational efficiency
Typical Daily Output
Can exceed 300 kg/day, depending on operational hours.
This capacity is commonly used where production consistency is critical.
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50kg Induction Furnace
Best For
- Large-scale refineries
- Bullion manufacturing plants
- Precious metal recycling facilities
- Industrial casting operations
Benefits
- Maximum productivity
- Lower operating cost per kilogram
- Suitable for 24/7 production
- High return on investment
Applications
- Gold refining
- Silver refining
- Large bullion casting
- Industrial alloy production
A 50kg furnace is ideal for businesses handling substantial production volumes every day.
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Furnace Capacity Comparison
| Furnace Capacity | Best For | Daily Production* | Investment Level |
| 1kg | Small workshops | Up to 15 kg | Low |
| 5kg | Growing manufacturers | 30–80 kg | Moderate |
| 10kg | Commercial production | 80–200 kg | Medium |
| 25kg | Industrial production | 200–400 kg | High |
| 50kg | Large-scale manufacturing | 400 kg+ | Higher |
*Actual output depends on metal type, melting cycle, operator efficiency, and working hours.
Common Mistakes When Selecting a Furnace
Buying Only for Today’s Requirement
Businesses often underestimate future production growth.
Buying a slightly larger furnace can be more economical in the long run.
Ignoring Power Availability
Always ensure your facility has the required:
- Voltage
- Three-phase power supply
- Electrical load capacity
Proper electrical planning prevents installation delays.
Choosing Based Only on Price
A lower-cost furnace may have:
- Lower energy efficiency
- Slower melting
- Higher maintenance
- Reduced lifespan
Evaluate the total cost of ownership, not just the purchase price.
Overlooking Service and Support
Reliable after-sales service is just as important as the equipment itself. Choose a manufacturer that offers:
- Installation assistance
- Operator training
- Spare parts availability
- Technical support
- Maintenance guidance
Continuous casting Furnace produces metal rods, strips, or profiles directly from molten metal in a continuous process, ensuring high productivity, uniform quality, and reduced material wastage.
Which Furnace Capacity Is Right for You?
Choose a 1kg furnace if you operate a jewelry workshop, laboratory, or require small-batch melting.
Choose a 5kg furnace if your business is expanding and needs reliable daily production.
Choose a 10kg furnace if you require consistent commercial manufacturing with higher output.
Choose a 25kg furnace if your operation focuses on continuous production and industrial-scale efficiency.
Choose a 50kg furnace if you run a large refinery, bullion production facility, or high-volume manufacturing plant.
Why Choose Delmer Induction Furnaces?
Delmer manufactures advanced induction melting systems engineered for precision, safety, and long-term performance.
Features
- IGBT-based induction technology
- Fast and uniform melting
- High energy efficiency
- Digital temperature control
- Heavy-duty construction
- Low maintenance requirements
- Multiple capacity options
- Suitable for gold, silver, platinum, copper, and other non-ferrous metals
- Designed for continuous industrial operation
Whether you’re starting a jewelry business or expanding a precious metal refinery, Delmer offers scalable furnace solutions tailored to your production requirements.
Frequently Asked Questions (FAQs)
Which furnace capacity is best for a jewelry workshop?
A 1kg induction furnace is ideal for jewelry workshops, sample melting, and small-batch production.
Is a 5kg furnace suitable for gold melting?
Yes. A 5kg furnace is widely used by jewelry manufacturers and small bullion producers for efficient gold melting.
Can one furnace melt different metals?
Yes. Most induction furnaces can melt gold, silver, copper, brass, platinum, and other compatible non-ferrous metals by using the appropriate crucible and following recommended operating procedures.
Should I buy a larger furnace for future expansion?
If you expect production to increase within the next few years, choosing a slightly larger capacity can reduce future upgrade costs and improve long-term efficiency.
Which furnace is suitable for a silver refinery?
Silver refineries typically use 10kg, 25kg, or 50kg induction furnaces, depending on daily processing volume and production requirements.
Final Thoughts
Selecting the right furnace capacity is about more than the size of the crucible—it’s about matching your production goals, energy efficiency, and future growth plans. By evaluating your daily output, the type of metal you process, available electrical infrastructure, and a long-term expansion strategy, you can invest in an induction furnace that delivers reliable performance and strong returns for years to come.
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