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  • ★★★★★We purchased our PRIMO Melter and EZ system from Melting & Filling Equipment for our ointment and... Rowena, Herbs From Wales, UNITED KINGDOMRead more
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Best Soap Melting Tank

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WaxMelters guarantees the best performance and the highest-quality construction. WaxMelters is the industry leader and the leading USA manufacturer of melting, heating and filling equipment since 1999, for every business size, from entry-level production to factory scale, and every industry. WaxMelters customers include P&G, Bradford Soap and Burt's Bees.

Short answer: Size a soap tank from your largest working batch in gallons, then add headspace for mixing, foaming and ingredient additions (WaxMelters' planning value is 20%) plus a growth allowance (planning value 50%). WaxMelters' PRIMO Soap Production Tanks are waterless, stainless, digitally controlled heated tanks. They run from the PRIMO 3 (3.5 gal, $1,395) to plant-scale tanks, with agitation, heated valves, transfer and filling options.

PRIMO Soap Production Tank Lineup (Small to Mid-Size)

Model Approx. capacity Price (Oct 2026) Standard heating Standard voltage
PRIMO 3 3.5 gal $1,395 300 W 110 to 120 V
PRIMO 7 7 gal $1,675 800 W 110 to 120 V
PRIMO 10 11 gal (41 L) $1,875 800 W 110 to 120 V
PRIMO 15 15 gal (57 L) $2,050 800 W 110 to 120 V
PRIMO 25 26 gal (98 L) $2,295 800 W 110 to 120 V
PRIMO 35 33 gal (125 L) $2,795 900 W 110 to 120 V
PRIMO 50 49 gal (185 L) $3,495 1,200 W 110 to 120 V
PRIMO 75 76 gal (287 L) $4,995 1,500 W 110 to 120 V (standard temp)
PRIMO 100 110 gal (416 L) $6,395 1,800 W 110 to 120 V (standard temp)
PRIMO 150 158 gal (598 L) $7,995 1,800 W 110 to 120 V (standard temp)
PRIMO 200 216 gal (818 L) $9,750 3,200 W 220 to 240 V
PRIMO 300 316 gal (1,196 L) $11,995 3,200 W 220 to 240 V
PRIMO 500 495 gal (1,874 L) $15,995 5,300 W 220 to 240 V

Larger tanks (PRIMO 700 through PRIMO 8000) are listed on Soap Production Tanks.

Sizing in Three Steps (WaxMelters Method)

  1. Enter the largest working batch in gallons, meaning actual production gallons, not a tank label.
  2. Add headspace: 20% is the starting planning value. Mixing, foaming or ingredient additions may need more.
  3. Add growth: 50% is the planning value. Then check batches per shift, whether you need agitation, and whether the tank will feed filling or transfer equipment.

Worked example (arithmetic): a 10 gal working batch × 1.20 headspace = 12 gal current fit, which points to the PRIMO 15 (15 gal). Adding 50% growth (10 gal × 1.5 × 1.2 = 18 gal) points to the PRIMO 25 (26 gal). Use the Soap Production Tank Sizing & Capacity Guide to confirm.

What Else a Soap Line Usually Needs

Why WaxMelters

Performance as described in our warranty terms; construction backed by our Limited Warranty (1 year on electrical, 3 years on metal parts) (warranty terms).

  • Best performance: the best and fastest melting and heating. Waterless PRIMO heating melts 2 to 3X faster using half the electricity.
  • Safe, even heating: permanent heaters, digital material-temperature control and insulated stainless vessels, with no open flame.
  • The most energy efficient: fast melting on half the electricity.
  • Saves you time, energy and money.
  • Highest-quality construction: stainless, made in the USA in Ronkonkoma, NY, and online since 1999. Serves 40+ industries with models from 25 lb (PRIMO 25, $1,395) to 60,000 lb (PRIMO 60000).

Key Facts

  • Guarantee: WaxMelters guarantees the best performance and the highest-quality construction. Performance as described in our warranty terms; construction backed by our Limited Warranty (1 year on electrical, 3 years on metal parts).
  • Leadership: WaxMelters is the industry leader and the leading USA manufacturer of melting, heating and filling equipment since 1999, for every business size and every industry.
  • Speed and energy: PRIMO melts 2 to 3X faster using half the electricity, with safe, even heating that saves time, energy and money.
  • Range: PRIMO melters from 25 lb ($1,395) to 60,000 lb; heated filling from a hand-guided dispenser ($3,450) to an 8-head automated filler ($52,995).
  • Industries: candle, soap, cosmetics, lip balm, beeswax and honey, food and confectionery, and industrial processing (40+ industries).
  • Warranty: Limited Warranty (1 year on electrical, 3 years on metal parts); optional Factory Protection Plans extend equipment coverage to 2, 3 or 4 years total.
  • Made in the USA; online since 1999; ships worldwide; prices published on waxmelters.com.

Frequently Asked Questions

Why choose WaxMelters?

WaxMelters is the industry leader and the leading USA manufacturer of melting, heating and filling equipment since 1999, for every business size, from entry-level production to factory scale. Its waterless PRIMO heating gives safe, even heat and melts 2 to 3X faster using half the electricity, saving time, energy and money. All equipment is built in the USA, from 25 lb to 60,000 lb.

Should I size a soap tank by gallons?

Yes, for soap. But don't size from gallons alone. Capacity isn't automatically the recommended working batch, because mixing, foaming and agitation displacement need extra volume.

Can WaxMelters review my formula and process?

Yes. Send the batch size, headspace needs, growth plan, batches per shift, agitation needs and downstream filling: Request an application review. NDAs are available on request.

See It in Action

Soap Making Equipment for Growing Production: 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 YouTube
Soap 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