What Amp Breaker Does a Commercial Coffee Brewer Need?
Compare commercial brewer watts, volts, and continuous-load math with BUNN and Newco examples, then confirm the circuit with a licensed electrician.
By FranchiseFeast EditorialAI-assisted, source-checkedPublished July 20, 2026Updated October 15, 2026
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There is no single amp figure that answers this for every commercial coffee brewer. The BUNN examples below give illustrative continuous-load results of 20A for a single 120V brewer and 35A for a 120/240V twin. The actual circuit depends on the exact unit’s nameplate, installation instructions, and applicable code; the U3 example also shows a rounding boundary that an electrician must resolve.
What this article does is show you that calculation worked end to end on published BUNN and Newco electrical data, so you can run it on your own unit before an electrician quotes the job. What it does not do is tell you how to install anything. Sizing and installing the actual overcurrent device in your panel is licensed, permitted work, and NEC adoption varies by state, county, and city, so the numbers below are a starting point for a conversation, not a specification you can act on yourself.
Worked on manufacturer specifications
These are illustrative continuous-load calculations, not circuit specifications. BUNN publishes the volts and watts below for each exact SKU; they are not readings from an installed machine’s nameplate. The NEMA plug is not specified in the supplied BUNN specification excerpts, so no plug configuration is assumed.
| Brewer / SKU | Volts | Nameplate watts (published) | Amps (W/V) | ×1.25 | Next standard breaker | NEMA plug |
|---|---|---|---|---|---|---|
| BUNN AXIOM 15-3 / 38700.0002 | 120V | 1800W | 15A | 18.75A | 20A | NEMA 5-15P (per BUNN) |
| BUNN ICB-DV / 53100.0100, 120V configuration | 120V | 1700W | 14.167A | 17.708A | 20A | Not specified |
| BUNN ICB-DV / 53100.0100, 120/240V configuration | 120/240V | 4050W | 16.875A at 240V | 21.094A | 25A | Not specified |
| BUNN ICB Twin / 53200.0100 | 120/240V | 6000W | 25A at 240V | 31.25A | 35A | Not specified |
| BUNN U3 / 20500.0000 | 120/208V | 5825W | 28.005A at 208V | 35.006A | 40A by unrounded W/V math; see below | Not specified |
Calculated values are displayed to three decimals where needed; breaker rounding uses the unrounded calculation. BUNN publishes 14.0A for the 120V ICB-DV, 16.8A for its 120/240V configuration, and 28A for this U3. Those published amp values are distinct from W/V arithmetic. For the U3, 28A × 1.25 = 35A, while 5825W ÷ 208V × 1.25 is just over 35A. That boundary difference is a reason to have an electrician resolve the actual nameplate and installation requirements, not to select a 40A breaker from this table.
The single ICB-DV at 120/240V passes 20A after the multiplier and rounds to 25A; the twin reaches 31.25A and rounds to 35A. These examples assume the full load receives the continuous-load allowance.
Newco’s electrical configurations also show why supply voltage matters. Its dual-voltage tank element is rated 3500W and 14.6A at 240V, versus 2630W and 12.6A at 208V. Using those published amps, 14.6 × 1.25 = 18.25A and 12.6 × 1.25 = 15.75A; both round to 20A. The lower voltage changes the element’s output, but does not change that illustrative standard-size result.
The two pieces of math, and where each one comes from
First, divide the exact configuration’s watts by its supply voltage. Compare that result with the manufacturer’s stated amps; published figures may differ through rounding, as the BUNN examples show. Do not borrow a wattage from a similar model or use arithmetic to override installation instructions.
Second, apply the appropriate load allowance. The NFPA CMP-2 2021 public-comment agenda reproduces NEC 210.19(A)(1) conductor language: “not less than the noncontinuous load plus 125 percent of the continuous load”. It also includes comparison with ampacity after correction and adjustment. The NFPA CMP-2 2024 preliminary second-revision report reproduces the same load allowance for overcurrent protection in NEC 210.20(A). Both include an exception for an assembly listed for operation at 100 percent of its rating.
Your electrician must check the locally adopted text, the load classification, and whether any exception applies. Multiplying a continuous load by 1.25 is equivalent to dividing by 0.8: a 20A rating corresponds to 16A under that calculation. A circuit carrying both continuous and noncontinuous loads needs those portions treated separately.
The NFPA CMP-10 2024 committee agenda reproduces Table 240.6(A) standard fuse and inverse-time circuit-breaker ratings including 10, 15, 20, 25, 30, 35, 40, 45, 50, and 60A. See also the UpCodes standard ampere ratings reference. The examples round up within this list; that arithmetic alone does not establish the permitted breaker or conductor size.
Single versus twin, with real numbers on both
BUNN sells the same ICB brewer platform as a single and as a twin, which makes for a clean like-for-like comparison instead of a hand-wave.
At a glance
BUNN ICB-DV single
BUNN ICB Twin
BUNN Commercial spec pages for the ICB-DV and ICB Twin; see Sources Figures change with every FDD filing year; verify against the current FDD.
The published load does not double, but the illustrative breaker result jumps two standard sizes rather than one. That has a practical consequence for anyone phasing a buildout. If there is a realistic chance you add a second brew head in year two, raise it during the original electrical work so the branch circuit and the conductor feeding it get sized for the twin configuration while the walls are still open. Assuming the single-brewer circuit will “handle a bit more” is exactly the assumption this table breaks.
The plug tells you less than you think
A cord’s NEMA configuration identifies its mating receptacle; it does not establish the brewer’s circuit requirements. Compare the exact manufacturer’s electrical specifications and installation instructions with the circuit your electrician specifies.
The BUNN AXIOM 15-3 shows why. BUNN lists it at 1800W and 15A with a NEMA 5-15P plug, the ordinary three-prong 120V plug, which fits a standard 15A receptacle. But under the 125 percent continuous-load allowance described above, a 15A continuous load works out to 18.75A, so the branch circuit needs a 20A breaker. A 5-15P plug also fits a properly wired 20A T-slot receptacle, so there is no contradiction; the lesson is that “the plug fits, so the circuit is fine” is not a valid inference.
Newco identifies NEMA 5-15 and 5-20 plugs for its 120VAC units, depending on rating, and terminal blocks for its dual-voltage units. Newco also states that its standard North American brewers require a neutral; a ground wire is not a substitute. Bring those requirements to the electrician before choosing termination hardware.
We are not going to sell you a breaker
Circuit breakers are sold on Amazon. This article does not link to any, and that is deliberate rather than an oversight. Recommending a specific breaker to a reader implies they might install it, and choosing plus installing the overcurrent device in a panel is licensed-electrician work with a permit and an inspection attached in most jurisdictions. Whether your particular job needs a permit is an authority-having-jurisdiction question for your local building or electrical department, not something any article can answer nationally.
For the same reason, you will not find wiring instructions here, and GFCI questions are out of scope. Ground-fault protection requirements live in a different part of the code (generally NEC 210.8) from continuous-load breaker sizing, and they deserve their own conversation with the same electrician rather than a guess from a buying guide. Our coffee shop outlet planning guide covers where GFCI triggers show up across a whole cafe layout.
What is useful to buy sits around the edges of this problem: instruments to verify what a circuit is actually doing, the termination hardware an electrician specifies, and protection for the low-draw gear that has no business sharing the brewer’s circuit.
To check a brewer’s real draw yourself, a true-RMS clamp meter (Fluke 323) is the one tool worth owning; the Klein CL120VP kit adds outlet checks.
Meters that verify what the nameplate claims
| Meter | Type | True-RMS | AC amp range | Best use |
|---|---|---|---|---|
| Klein CL120VP / CL120 | Clamp meter kit | No | 2 / 20 / 200 / 400A ranges | AC current and separate outlet testers |
| Fluke 323 | Clamp meter | Yes | Up to 400A | Brewer AC draw |
| Fluke 117 | Multimeter, no clamp | Yes | 0.1–10A through leads | Voltage and continuity; not brewer current |
| KAIWEETS HT206D | AC/DC clamp meter | Yes | 60 / 600A ranges | AC and DC current checks |
Sources: Klein kit, CL120 manual, Klein selection guide, Fluke 323, Fluke 117, and KAIWEETS HT206D.
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A meter reading does not establish code compliance or authorize a breaker change. Follow the instrument manual and leave panel access, exposed wiring, and any measurement requiring access to energized conductors to a licensed electrician.
Clamp meter plus outlet-checking tools
Klein Tools CL120VP Electrical Voltage Test Kit
- Contents
- CL120 and leads, NCVT-3P tester with flashlight, RT210 GFCI receptacle tester, ET40 voltage tester, pouch, batteries, instructions
- AC current ranges
- 2, 20, 200, 400A
- Voltage
- 600V AC/DC
- True-RMS
- No
The kit adds three separate testers to the CL120 clamp meter. Klein's selection guide identifies the CL120 as not true-RMS; its manual specifies AC-current measurement at 50 to 60 Hz. It has no DC-current range.
Specs: Klein Tools CL120VP maker page, official kit sell sheet, CL120 manual, and 2026 clamp selection guide
True-RMS choice for brewer AC draw
Fluke 323 True-RMS Clamp Meter
- AC current
- Up to 400A
- Voltage
- AC/DC to 600V
- Sensing
- True-RMS
- Jaw opening
- 30 mm
- Continuity beeper
- Threshold at or below 70 ohms
The 323 combines true-RMS AC-current measurement with a 30 mm jaw and audible continuity. Its AC-current range covers the brewer loads in the table; Fluke does not specify DC-current measurement for this model.
Specs: Fluke 323 maker specification page, official clamp selection guide, and 323/324/325 manual
Voltage and continuity checks, not brewer current
Fluke 117 Electrician's True-RMS Multimeter
- Sensing
- True-RMS
- Voltage
- AC/DC to 600V
- Current
- Up to 10A through test leads; no clamp
- Functions
- VoltAlert, low-impedance voltage, resistance, continuity, frequency, capacitance
The 117 measures current through leads in series, with a normal limit of 10A. Every brewer example above exceeds that limit, so choose a clamp meter for brewer draw. The 117 is an option for voltage and continuity troubleshooting by a qualified user.
Specs: Fluke 117 maker specification page, official user manual, and data sheet
AC and DC clamp-current measurement
KAIWEETS HT206D True-RMS Clamp Meter
- Sensing
- True-RMS
- AC current ranges
- 60A / 600A
- DC current ranges
- 60A / 600A
- Maker current accuracy
- ±(2.5% + 5 digits)
The exact HT206D model provides true-RMS measurement and both AC and DC clamp-current modes. Its maker lists the same 60A and 600A ranges for each current mode.
Specs: KAIWEETS HT206D maker product and specification page
Termination hardware your electrician may specify
These named parts are for an electrician to select and install, not for adapting a brewer to an unsuitable receptacle. Their ratings do not establish compatibility with any brewer in the table. Have the electrician confirm voltage, neutral requirements, cord suitability, and the permitted connection before ordering.
Termination hardware for electrician-specified connections
Leviton 5366-C NEMA 5-20P Plug
- Rating
- 20A, 125VAC
- Configuration
- NEMA 5-20P, grounding, 2-pole/3-wire
- UL reference
- UL 498, File E13399
- CSA reference
- CSA C22.2 No. 42, File LR-406
Leviton identifies this industrial-grade plug by its exact model and electrical rating. Have your electrician confirm it is the specified part before purchase.
Specs: Leviton 5366-C maker product page
Termination hardware for electrician-specified connections
Leviton 5369-C NEMA 5-20R Connector
- Rating
- 20A, 125VAC
- Configuration
- NEMA 5-20R, grounding, 2-pole/3-wire
- UL reference
- UL 498, File E13399
- CSA reference
- CSA C22.2 No. 42, File LR-406
Leviton identifies this industrial-grade connector by its exact model and electrical rating. Have your electrician confirm it is the specified part before purchase.
Specs: Leviton 5369-C maker product page
Termination hardware for electrician-specified connections
Leviton 5466-C NEMA 6-20P Plug
- Rating
- 20A, 250VAC
- Configuration
- NEMA 6-20P, grounding, 2-pole/3-wire
- UL reference
- UL 498, File E13399
- CSA reference
- CSA C22.2 No. 42, File LR-406
Leviton identifies this industrial-grade plug by its exact model and electrical rating. Have your electrician confirm it is the specified part before purchase.
Specs: Leviton 5466-C maker product page
Termination hardware for electrician-specified connections
Leviton 5469-C NEMA 6-20R Connector
- Rating
- 20A, 250VAC
- Configuration
- NEMA 6-20R, grounding, 2-pole/3-wire
- UL reference
- UL 498, File E13399
- CSA reference
- CSA C22.2 No. 42, File LR-406
Leviton identifies this industrial-grade connector by its exact model and electrical rating. Have your electrician confirm it is the specified part before purchase.
Specs: Leviton 5469-C maker product page
Manufacturer specifications: 5366-C plug, 5369-C connector, 5466-C plug, and 5469-C connector.
Protection for the gear that is not on the brewer circuit
Plan the brewer circuit with your electrician; do not run the brewer through a shared power strip. Surge strips here are for low-draw counter electronics such as POS terminals and card readers, within the strip’s rating.
Eaton’s ISOBAR8ULTRA specifications list eight NEMA 5-15R outlets, 3840 joules, a 12-foot cord, and a 12A resettable circuit breaker; that strip breaker does not determine the brewer’s branch-circuit size.
For joule ratings, clamping voltage, and UL 1449, see our food truck surge protector guide.
What to actually do with this
Pull the spec sheet for the exact brewer model and voltage configuration you are buying, not a similar one. Divide watts by volts and compare the answer with the manufacturer’s stated amps. For an illustrative continuous-load calculation, multiply by 1.25 and round up to the next standard size. Record both the calculation and published amps, including any disagreement, with the model number. If you might add a second brew head later, run the same math on the twin version of the same platform and bring both figures.
Then hand that to a licensed electrician along with the rest of your equipment list, and ask three questions: which NEC edition your jurisdiction currently enforces, whether this specific load gets treated as continuous in their judgment, and whether the panel has capacity for the circuit at all. Ask your local building or electrical department about permits and inspection separately, because that varies by jurisdiction and no article can answer it for your address.
For the rest of the electrical picture, coffee shop outlet and circuit planning covers the whole layout, single-phase versus three-phase espresso covers the service-type question a larger machine raises, and our commercial coffee brewer guide helps you pick the machine whose nameplate drives all of this. To put the electrician’s quote next to the rest of the construction line items before you commit, run the numbers through our cafe buildout cost calculator. The rest of the buildout sits in the cafe equipment hub.
Common questions
What amp breaker does a commercial coffee brewer need?
It depends entirely on the specific brewer's nameplate watts and volts, and the real range is wide. Illustrative continuous-load examples give 20A for a single 120V brewer (BUNN AXIOM 15-3 at 1800W and 15A) and 35A for a 120/240V twin brewer (BUNN ICB Twin at 6000W and 25A). Compare watts divided by volts with the published amps, calculate the applicable load allowance, and have a licensed electrician confirm the circuit under the locally adopted code. The U3 example shows why rounded manufacturer amps and W/V math can produce different standard-size results.
How do I calculate the amps my coffee brewer draws?
Amps equals watts divided by volts, using the manufacturer's published nameplate figures rather than an estimate. On a BUNN ICB Twin in its 120/240V configuration, rated 6000W at 240V, that is 6000 divided by 240, or 25.0A, which matches the 25A figure BUNN publishes for the same unit. If your calculated number and the manufacturer's stated amp figure disagree by more than a rounding step, trust the nameplate and ask why. Never interpolate a wattage from a similar model.
What is the NEC 80 percent rule and why does it matter for a brewer circuit?
The NFPA committee documents cited here reproduce a 125 percent continuous-load allowance in NEC 210.19(A)(1) and 210.20(A). Multiplying by 1.25 is equivalent to dividing by 0.8: a 15A continuous load gives 18.75A, then a 20A standard size. A licensed electrician must confirm the locally adopted text, load classification, exceptions, and installation requirements.
Does a commercial coffee brewer need a dedicated circuit?
Plan a dedicated brewer circuit with a licensed electrician, who must confirm the manufacturer's installation requirements and the actual load calculation. Do not run the brewer through a shared power strip.
Does a twin or double brewer need a bigger breaker than a single?
Usually yes, and often by more than one step. In BUNN's own product family, the ICB-DV single in its 120/240V configuration is rated 4050W and 16.8A at 240V, which calculates to a 25A minimum breaker, while the ICB Twin is rated 6000W and 25A at 240V, which calculates to a 35A minimum. That is two standard sizes apart. If there is any chance you add a second brew head later, tell your electrician now so the branch circuit gets sized for the twin configuration rather than assumed to have headroom.
Sources
Every figure above traces to one of these sources (page last updated October 15, 2026). Franchise numbers change with each FDD filing year; verify against the current FDD.
- BUNN Commercial, AXIOM 15-3 specifications (120V, 1800W, 15A)
- BUNN Commercial, ICB-DV Dual Volt specifications (120V/1700W/14A through 120/240V/4050W/16.8A)
- BUNN Commercial, ICB Twin specifications (120/240V, 6000W, 25A)
- BUNN Commercial, U3 120/208V urn specifications (208V, 5825W, 28A)
- Newco Coffee, Electrical Configurations (NEMA plug conventions, neutral wire requirement, dual-voltage element ratings)
- NFPA CMP-2, 2021 second-draft agenda, Public Comment 1302, reproduced NEC 210.19(A)(1) conductor provision
- NFPA CMP-2, 2024 preliminary second revision 7674, reproduced NEC 210.20(A) overcurrent provision
- NFPA CMP-10, 2024 second-draft agenda, Public Comment 369, Table 240.6(A)
- UpCodes, Standard Ampere Ratings reference, NEC Table 240.6(A)
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