Electric Brewery Calculator
Find the amps, breaker, wire and outlet your electric brewing system needs, and how long it takes to heat your water.
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How to size a circuit for an electric brewery
Watts ÷ volts = amps. A 5,500 W element on 240 V draws 22.9 A. Brewing elements run near full power for long stretches, so electricians size the breaker at 125% of the draw: 22.9 × 1.25 = 28.6 A, which means a 30 A breaker on 10 AWG copper wire. An 11,000 W element on 240 V draws 45.8 A and needs a 60 A breaker.
If your controller also runs a 120 V pump or accessory, the circuit needs a neutral: a 4-wire outlet such as a NEMA 14-30 (the same one a clothes dryer uses). Our SV2 controller plugs into a NEMA 14-30 and runs a 5,500 W element.
Breaker and wire sizes
Typical copper wire for each breaker, and the most you should run on it for hours at a time (80% of the breaker). Longer wire runs and local codes can call for heavier wire.
| Breaker | Typical copper wire | Most for long runs |
|---|---|---|
| 15 A | 14 AWG | 1,440 W at 120 V |
| 20 A | 12 AWG | 1,920 W at 120 V |
| 20 A | 12 AWG | 3,840 W at 240 V |
| 30 A | 10 AWG | 5,760 W at 240 V |
| 40 A | 8 AWG | 7,680 W at 240 V |
| 50 A | 6 AWG | 9,600 W at 240 V |
| 60 A | 4 AWG | 11,520 W at 240 V |
120 V or 240 V?
A standard 120 V outlet can run a 1,650 W element. That brews fine, just slowly, and the element should have the circuit to itself. A 240 V circuit runs a 5,500 W element, which heats more than three times as fast. Heat-up times with the lid on:
| Element | 8 gal to 165°F (strike) | 8 gal to boil | 31 gal (1 BBL) to boil |
|---|---|---|---|
| 1,650 W (120 V) | 1 h 33 min | 2 h 15 min | 8 h 44 min |
| Two 1,650 W on separate circuits | 47 min | 1 h 08 min | 4 h 22 min |
| 5,500 W (240 V) | 28 min | 41 min | 2 h 37 min |
| 11,000 W (240 V) | 14 min | 20 min | 1 h 19 min |
208 V and 3-phase buildings
Many commercial spaces have 208 V instead of 240 V. A 240 V element on 208 V makes only 75% of its rated power, because power falls with the square of the voltage: a 5,500 W element gives about 4,130 W. You can live with slower heating or use elements rated for 208 V.
On 3-phase power the load is shared across three lines, so each line carries less current: amps = watts ÷ (1.732 × volts). Ask your electrician to spread the elements evenly across the phases.
Stay safe
- Put every brewing circuit on GFCI protection: a GFCI breaker or a spa panel.
- Never switch on an element that isn’t fully covered by water or wort.
- Don’t run brewing elements on extension cords.
- Have a licensed electrician install the circuit and check it against your local code.
Questions
What size breaker do I need for a 5,500 W element?
A 30 A double-pole breaker on 10 AWG copper wire, GFCI protected. Use a NEMA 14-30 outlet if your controller also needs 120 V for a pump, or an L6-30 if it doesn’t.
Can I brew on a regular 120 V outlet?
Yes. A 1,650 W element runs on a standard 120 V outlet, ideally on a circuit with nothing else on it. It’s slower to heat. Two 1,650 W elements on two separate circuits nearly halve the heat-up time.
How long does it take to boil 10 gallons with a 5,500 W element?
About 51 min from 60°F tap water with the lid on. From mash temperature to boil it’s much quicker, about 20 min.
Will a 240 V element work on 208 V?
Yes, at about 75% of its rated power. A 5,500 W element gives about 4,130 W on 208 V. It’s safe; it just heats more slowly.
Do I need a GFCI for an electric brewery?
Yes. You’re working with water, wort and metal kettles next to high-current elements. A GFCI cuts the power in a fraction of a second if current leaks to ground. Use a GFCI breaker or a spa panel between your main panel and your brewing outlet.