The Complete Guide to Jewelry Burnout Furnaces: How to Choose the Right Kiln for Your Studio

If you're doing lost wax casting, your burnout furnace is one of the most critical pieces of equipment in your workflow. Get it wrong and you'll deal with cracked molds, incomplete wax burnout, and porous castings. This guide covers everything you need to know — and helps you find the right Tooltos burnout furnace for your studio.

What Does a Burnout Furnace Do?

A burnout furnace (also called a casting kiln or burnout kiln) does two essential jobs in the lost wax casting process:

1. Burns out the wax from your invested plaster flask, leaving a perfect negative cavity
2. Preheats the flask to the correct temperature so molten metal flows cleanly into every detail

Without proper burnout, you get incomplete wax removal, gas pockets, and failed castings. A quality furnace with precise temperature control is non-negotiable for consistent results.

The Lost Wax Burnout Process: Step by Step

Stage	Temperature	Duration	What Happens
Wax elimination	150–300°C	60–90 min	Wax softens and drains out
Wax burnout	300–580°C	90–120 min	Remaining wax burns away completely
Flask strengthening	580–730°C	60–90 min	Plaster bonds and strengthens
Final preheat	730–900°C	60–120 min	Flask reaches casting temperature
Hold / cool down	700–780°C	Until casting	Flask held at optimal pour temperature

This is why segmented (programmable) heating matters — each stage requires a different temperature and hold time. A furnace that can automate this cycle saves you from manually adjusting temperatures throughout a 6–8 hour burnout.

Key Features to Look for in a Burnout Furnace

1. Temperature Range

• 800°C models — Sufficient for standard silver, gold, and brass casting with investment plaster
• 1150°C models — Needed for higher-temperature alloys, ceramic shell casting, or maximum flexibility

2. PID Temperature Control
PID controllers maintain precise temperatures within plus or minus 2°C. This is essential — even a 20°C deviation during burnout can cause mold cracking or incomplete wax removal.

3. Segmented / Programmable Heating
A programmable furnace lets you set multiple temperature stages and hold times, then walk away. The furnace runs the entire burnout cycle automatically overnight.

4. Wax Drain and Exhaust Port
A wax drain collects liquid wax during early burnout, keeping your furnace clean and reducing smoke. An exhaust port vents gases safely. Both are important for studio safety and furnace longevity.

5. Observation Window
A transparent window lets you check flask status without opening the door — preventing heat loss and protecting you from heat exposure.

6. Chamber Size
Most jewelry studios use flasks up to 4" x 7". Verify your furnace accommodates your largest flask size.

Tooltos Burnout Furnace Lineup: Which Model is Right for You?

Model	Max Temp	Programmable	Window	Wax Drain	Best For
800°C Entry Level	800°C	Basic PID	No	No	Beginners, hobbyists
800°C 5-Stage Segmented	800°C	5-stage auto	No	Yes	Small studios
800°C Dual PID	800°C	Manual + Auto	No	Yes	Production studios
1150°C with Window	1150°C	PID	Yes	No	Professional studios
1150°C Dual Layer	1150°C	PID	Yes	No	Batch production

Tooltos 800°C Entry Level Burnout Furnace — Best for Beginners

For individual jewelers, hobbyists, and students just starting with lost wax casting. Max temperature 800°C, 1500W with silicon oxide lining, compact at 15.5 kg, basic PID controller. No segmented programming or wax drain. View Tooltos 800°C Entry Level Furnace

Tooltos 800°C 5-Stage Segmented Furnace — Best for Small Studios

Built-in 5-stage automated program: 180°C / 90 min → 350°C / 90 min → 580°C / 120 min → 900°C / 120 min → Cool down to 780°C. Includes exhaust port and wax drain system. Set it before bed, wake up to a ready flask. View Tooltos 5-Stage Segmented Furnace

Tooltos 800°C Dual PID Furnace — Best for Production Studios

Dual PID controllers: Controller 1 for custom manual schedules, Controller 2 for preset 5-stage auto program. Stainless steel shell with replaceable gypsum inner lining, exhaust port and wax drain. Maximum flexibility for different alloys and casting jobs. View Tooltos Dual PID Furnace

Tooltos 1150°C Furnace with Observation Window — Best for Professional Studios

Max temperature 1150°C, plus or minus 2°C PID accuracy, transparent observation window to monitor flask status without opening the door. Accommodates flasks up to 4" x 7", universal 110V / 220V voltage. View Tooltos 1150°C Furnace with Window

Tooltos 1150°C Dual Layer Furnace — Best for Batch Production

Removable separation plate divides chamber into two levels for processing 2 flasks simultaneously. Remove the plate for full 200mm height to accommodate taller flasks. Observation window and plus or minus 2°C PID accuracy included. View Tooltos 1150°C Dual Layer Furnace

How to Choose: Decision Guide

New to casting or on a tight budget? Go with the 800°C Entry Level — straightforward, compact, affordable.

Want automated overnight burnout cycles? Choose the 800°C 5-Stage Segmented — set the program, walk away.

Need both manual and auto control for different jobs? The 800°C Dual PID gives you maximum flexibility.

Need temperatures above 800°C or want an observation window? The 1150°C with Window is your model.

Running batch production with multiple flasks? The 1150°C Dual Layer doubles your output per cycle.

Use and Maintenance Tips

• Proper ventilation — Always use your furnace in a well-ventilated area. A dedicated exhaust fan or fume hood is strongly recommended for enclosed studios.
• Regular cleaning — Keep the chamber floor clean of spilled investment or wax residue after each use. A soft brush when fully cooled works well.
• Avoid overloading — Allow enough space between flasks for air to circulate evenly. Overcrowding leads to uneven heating and inconsistent burnout results.
• Never rush the wax elimination stage — Temperatures below 300°C must be held long enough for all wax to drain before it burns. Rushing causes carbon deposits that weaken your casting.
• Log your burnout cycles — Keep notes on temperature, hold times, and casting results. Over time you'll dial in the perfect schedule for your specific investment and flask sizes.

Frequently Asked Questions

Can I use a regular kitchen oven for wax burnout?
No. Kitchen ovens cannot reach the temperatures required for complete carbon elimination (typically 700–900°C) and lack the precise PID temperature control needed for jewelry investment.

What temperature do I need for silver casting?
800°C is sufficient for standard sterling silver lost wax casting with investment plaster. The flask is typically held at 700–780°C at pour time.

What temperature do I need for gold casting?
Yellow, white, and rose gold alloys cast well at 700–800°C flask temperature. 800°C furnaces handle this comfortably.

How do I know if my burnout was successful?
A clean burnout results in a white or light gray investment surface inside the sprue hole. Darker gray or black areas indicate carbon residue, which causes porosity in your finished casting.

How long does a full burnout cycle take?
A complete burnout cycle typically runs 6–10 hours depending on flask size and wax volume. This is why programmable furnaces are so valuable — you run the cycle overnight.

Do I need a wax drain?
Strongly recommended. Without a wax drain, liquid wax pools in the furnace chamber during early burnout stages, creating smoke, odor, and potential fire risk. The Tooltos segmented and dual PID models include this feature.

What investment plaster works with Tooltos furnaces?
Standard jewelry investment plasters such as Kerr Satin Cast, R and R Plasticast, or equivalent work with all Tooltos burnout furnaces. Follow the investment manufacturer's recommended burnout schedule.

Is 110V or 220V better?
All Tooltos burnout furnaces support both 110V and 220V. In the US, 110V is standard household current. 220V (if available in your studio) provides faster heat-up and more stable performance.