Electric Brewing for Beginners: 120V vs 240V, Systems and Setup

The short answer: electric brewing heats your water and wort with an immersed heating element and a controller instead of a gas burner. It works indoors, holds mash temperatures to within a degree, and makes step mashing a setpoint change. 120V systems plug into a normal outlet and suit 5 gallon batches. 240V systems need a dryer-style outlet but heat 10 gallons or more quickly with a 5,500 W element.

120V vs 240V

	120V	240V
Outlet	Standard household outlet	Dryer-style outlet (NEMA 14-30) on a 30A breaker
Element	About 1,650 W	5,500 W
Best batch size	Up to about 5 gallons	10 gallons and up
Heating 5 gal to a boil	Roughly 70 to 90 minutes	Roughly 20 to 25 minutes
Heating 10 gal to a boil	Too slow for regular use	Roughly 40 to 45 minutes
Install	None	An electrician adds the outlet if you don’t have one

Times are from about 60°F and include typical heat losses; a lid and an insulated kettle help. For the physics behind them, see boiling and cooling wort.

Types of electric brewing systems

System	How it works	Good for
Single vessel	Mash, sparge and boil in one kettle with a grain basket; a pump recirculates during the mash	Small spaces, simple brew days, first all-grain system
Two vessel	A dedicated mash tun plus a second vessel for the boil (and, in some systems, fermentation)	Faster brew days and no lifting a heavy grain basket
Three vessel (HERMS)	Hot liquor tank, mash tun and boil kettle; wort recirculates through a coil in the hot water to hold mash temperature	Back-to-back batches, very even step mashes, larger volumes

Our systems cover all three: the single-vessel Unibräu (and the Unibräu All-In, which also ferments in the same vessel), the two-vessel BräuPro, whose second vessel is a jacketed Unitank for boiling and fermenting, and the three-vessel HERMS system.

What an electric system is made of

• Heating element. Choose ultra-low watt density (ULWD) elements, which spread the heat over more surface so they don’t scorch wort. Our 5,500 W ULWD element mounts on a 1.5" tri-clamp port.
• Controller. Reads a temperature probe and switches the element to hold your setpoint, then runs it flat out for the boil. Ours are the SV1, which runs a 1,650 W element on 120 V, and the wall-mounted SV2 for a 5,500 W element on 240 V.
• Pump. Recirculates wort through the grain bed so the whole mash stays at temperature, and moves wort between vessels.
• Thermowell and fittings. Tri-clamp fittings make every port swappable and easy to clean.
• Steam condenser. Indoors, a boil makes a lot of steam. A steam condenser turns it back into water so you don’t need an exhaust hood.

An electric brew day

1. Fill with strike water and let the controller heat it to your strike temperature.
2. Dough in and recirculate. The controller holds the mash temperature; raise the setpoint for any step or mash-out. See our mash temperature chart and step mashing guide.
3. Sparge, or lift the grain basket, then switch the controller to full power for the boil.
4. Chill and transfer to your fermenter.

Electrical safety

• Use GFCI protection. Water and electricity share a brew space; a GFCI outlet, breaker or cord protects you.
• Use the right circuit. A dedicated circuit rated for the element, and for 240V a proper 30A outlet installed by an electrician.
• Never fire an element dry. It must be covered with liquid before you switch it on, or it will burn out.
• Keep connections dry and cords off the floor.

Frequently asked questions

Can I brew with electric on a regular 120V outlet?

Yes, for batches up to about 5 gallons. A 120V element is about 1,650 W, so bigger batches take too long to heat.

What outlet do I need for a 240V system?

For our SV2 controller, a NEMA 14-30 dryer-style outlet on a 30A breaker, ideally GFCI protected. An electrician can add one if your brew space doesn’t have it.

Do I need an exhaust hood to brew electric indoors?

Not if you use a steam condenser, which turns the boil steam back into water. Without one, you’ll want good ventilation.

Is electric brewing expensive to run?

No. A 10 gallon brew day uses roughly 8 to 12 kWh, which is a dollar or two of electricity at typical rates.

Single vessel or multi-vessel?

Single vessel is simpler, smaller and cheaper. Two- and three-vessel systems make brew days faster, avoid lifting a heavy grain basket, and handle bigger batches and back-to-back brewing.

What circuit do you need? Our free electric brewery calculator works out the amps, breaker, wire and outlet for your element, and how long your water takes to heat on 120 V or 240 V.