Same start as cold process, but you cook the batch with heat to drive saponification, then mold. The workhorse is a heated tilting kettle you can mix in and tip out.
Cook the paste, dilute it, then bottle. Built around KOH, not bar-soap lye. You need heated tanks to cook and hold, plus filling to fill bottles cleanly.
Melt a ready-made base, add color and scent, pour to mold. No lye handling. You need a clean melter to hold base at pour temp and equipment to fill molds or containers.
Complete Systems, Filling & Transfer, Production Tanks
Melt & PourPre-made base, no lye
Melt base, hold at pour temp, fill molds or containers
Complete Systems, Filling & Transfer, Production Tanks
One note on lyeNaOH for bar soap, KOH for true liquid soap
Cold and hot process bar soap use sodium hydroxide (NaOH). True liquid soap uses potassium hydroxide (KOH). Our Lye / NaOH tanks are built for caustic-solution prep either way. Tell us which you run and we will spec it right.
Why Soap Makers Choose PRIMO Waterless Soap Tanks
PRIMO soap tanks heat with no jacket-water reservoir. Before choosing by price or gallons alone, review heat path, connected heating power, footprint, usable capacity and operating requirements.
No Jacket Water. No Routine Replacement Heaters.
PRIMO Soap Production Tanks have no jacket-water reservoir and use permanent heating elements designed to remain part of the heating system under normal intended operation.
No Jacket Water to Fill or Maintain
No separate water reservoir to fill before production, monitor for proper level or replenish as part of normal water-jacket operation.
Permanent Heating Elements
PRIMO uses permanent heating elements designed so routine replacement heaters are not required under normal intended operation.
Explore the Complete Operating Cost
Review more than purchase price and gallons. Review connected heating power, footprint, usable capacity, operating time and long-term service considerations.
Choosing a PRIMO soap production tank? PRIMO soap production tanks have no water jacket to heat, maintain or service. They use permanent heating elements while digitally controlling the temperature of the production material.
Open any topic below for sizing, workflow and selection detail.
What Is Slowing Soap Production Down?A quick production self-assessment
The best equipment decision begins with the actual production constraint—including the heating method itself. Use these questions as a quick production self-assessment.
Waiting for the Tank—or Jacket Water—to Heat?
If production is delayed while a jacket and the material come up to process temperature, review the complete heat-up path and time to process-ready condition.
Heat-up time · Jacket thermal mass · Process-ready time
Do not review heater wattage alone. Review connected heating power, measured or modeled kWh, operating time, footprint and the same production requirement.
Quick Soap Production Tank SizingFind your current fit & growth fit in gallons
Soap Production models are selected in gallons. Use this quick tool as a starting point before reviewing headspace, mixing, recovery and downstream demand.
Quick PRIMO Soap Production Sizing
Find Your Current Fit & Growth Fit
Enter the working volume you run today. The calculator provides a current-fit starting point and a larger growth-oriented PRIMO Soap Production class.
Planning tool only. Final equipment selection should also consider material behavior, practical headspace, mixing or agitation, heating requirements, available electrical service and downstream production demand.
From Raw Ingredients to Controlled FillingBuild the production workflow
Soap manufacturing can involve several separate thermal and material-handling steps. Build only the stages your formulation requires, then connect them as production grows.
HeatOils, fats, tallow, butters or soap base
Prepare / MixIncorporate ingredients and formulate the batch
HoldMaintain required process temperature
TransferMove material without repeated manual carrying
FillSupply molds, containers or downstream packaging
Do not size only the tank. A larger production vessel does not solve the problem if mixing, transfer or filling is already slower than upstream heating. Size the equipment around the complete production sequence.
Size, Configure and Plan the SystemProduction planning tools
Use the same engineering and production-planning tools across the Soap Production equipment line.
Soap Production Tank Sizing
Review gallon capacity, practical headspace, current production and future growth.
WaxMelters guarantees the best performance and the highest-quality construction.
As the industry-leading US manufacturer of melting and filling equipment, we build for every business size, from startups to factories, in every industry. We’re proud to hold an A+ rating with the Better Business Bureau.
Tell Us What You Make and Where Production Slows Down
Send the formulation or material type, largest working batch in gallons, operating temperature, current process, daily output and production goal. We will help identify the appropriate tank, mixing, transfer, filling or complete-system configuration.
Start with the largest working batch in gallons, then account for practical headspace, mixing displacement, ingredient additions, daily production and expected growth. Physical vessel capacity is not automatically the recommended working batch.
Can these tanks heat oils, fats, tallow and butters?
PRIMO Soap Production Tanks are intended for compatible heated soap-production ingredients including oils, fats, tallow, butters, glycerin and melt-and-pour soap bases. Final configuration should match the material, temperature and viscosity.
Do I need a Soap Production Tank or a mixing kettle?
Choose a production tank when the primary requirement is heating, melting or holding. Evaluate a mixing tank or tilting kettle when active ingredient incorporation, batch uniformity or controlled batch discharge is a major part of the process.
Can filling equipment connect directly to the Soap Production Tank?
Many configurations can supply dispensing, heated transfer or filling equipment from the production vessel. Valve size, viscosity, temperature, pump requirements and downstream consumption should be reviewed.
What if I need lye / NaOH processing equipment?
Use the dedicated Lye / NaOH equipment section. Caustic-solution equipment requires review of concentration, wetted materials, seals, valves, working volume and facility handling procedures.
Can I start with one machine and expand later?
Yes. A production system can begin with ingredient heating or a Soap Production Tank and later add mixing, transfer, dispensing or filling as the bottleneck moves downstream.
See it in action
Soap Making Equipment for Small Business: Heated Pot Tipper Demo The PRIMO heated pot tipper heats, mixes and pours soap in one stainless steel tilting kettle, so one person can pour a full batch into molds with a controlled tilt. Watch on YouTubeSoap Melting Tank Demo: Energy-Efficient PRIMO for Soap Makers A waterless PRIMO melting tank heats soap base, oils and butters 2-3X faster using half the electricity, with safe, even heating set on a digital controller. Watch on YouTube
Upgrades and options (such as X-Treme high temperature, longer hoses and other add-ons) ship in 7 days or longer.
