Calculator Inputs
Example Data Table
| Scenario | Tables | Wells | Watts per well | Voltage | Use case |
|---|---|---|---|---|---|
| Small cafe line | 1 | 3 | 700 | 120 | Light lunch holding |
| Busy buffet | 2 | 4 | 750 | 208 | Continuous service |
| Institution kitchen | 3 | 5 | 900 | 240 | Heavy batch holding |
Formula Used
- Total wells = number of tables × wells per table.
- Connected kW = tables × ((wells × watts per well) + accessory watts) ÷ 1000.
- Service demand kW = connected kW × demand factor × safety factor.
- Water heat-up kW = kg water × 4.186 × temperature rise ÷ (3600 × heat-up hours × efficiency).
- Evaporation kW = kg per hour × 2257 ÷ (3600 × efficiency).
- Process kW = (heat-up kW + evaporation kW + standby kW) × safety factor.
- Single phase amps = kW × 1000 ÷ (volts × power factor).
- Three phase amps = kW × 1000 ÷ (1.732 × volts × power factor).
- BTU/h = design kW × 3412.142.
How to Use This Calculator
- Enter the number of steam tables and wells per table.
- Use nameplate watts per well when manufacturer data is available.
- Add accessory watts for lights, controls, pumps, or heated shelves.
- Select the actual voltage, phase, and expected power factor.
- Set water volume, starting temperature, target holding temperature, and heat-up time.
- Adjust duty cycle, demand factor, and safety factor for the operating profile.
- Press the calculate button and review the result above the form.
- Download the CSV or print the page as a PDF for project records.
Restaurant Steam Table Load Planning
A restaurant steam table looks simple, but its load can affect several design items. It can change panel capacity, branch circuit size, feeder demand, hood heat gain, and operating cost. A wet well also needs enough energy to raise water temperature and replace evaporated water. A dry well mainly needs rated element power and standby allowance. Both cases need careful review before installation.
What The Load Includes
The calculator separates connected load from process load. Connected load uses the equipment nameplate. It includes well heaters, controls, lights, and small accessories. Process load estimates water heating, evaporation, and standby losses. The larger result helps you see whether the selected unit can meet the service target. It also helps compare heat-up time against the available heater capacity.
Design And Construction Use
Contractors can use the result during early kitchen coordination. Electricians can check breaker amps before rough-in. Mechanical designers can estimate heat rejected to the kitchen and hood area. Owners can estimate monthly energy cost from duty cycle and schedule. The tool does not replace local code review. It gives a structured check before a stamped design or manufacturer submittal is finalized.
Important Field Assumptions
Steam tables cycle during holding service. They rarely draw full power every minute. Demand factor and duty cycle represent that behavior. High traffic service may need higher values. Long idle periods may need lower values. Water depth also matters. Deeper wells need more heat at startup. Open pans lose more water and heat than covered pans. A poor lid routine can increase evaporation quickly.
Reading The Results
Use the design kilowatt value for preliminary service sizing. Use load amps and breaker advice as a planning guide. Confirm conductor size, overcurrent protection, and disconnect rules with the adopted electrical code. Review phase and voltage carefully. A three phase connection reduces line current for the same kilowatt load. A low power factor raises current. Review nameplates before ordering equipment.
Safety Margin And Review
Add reserve for aging controls, higher ambient temperature, and busy service periods. Keep assumptions visible in the report. Share the inputs with the equipment supplier. Ask for exact nameplate data before procurement. Recheck the final schedule after menu changes, pan layout changes, or future line expansions, and final inspection planning notes.
FAQs
What is a restaurant steam table load?
It is the electrical and heat load created by steam table wells, controls, accessories, water heating, evaporation, and standby losses during food holding service.
Should I use nameplate watts?
Yes. Nameplate watts are the best starting point for connected load. Use estimated watts only during early planning when exact equipment data is not available.
Why does the calculator include water volume?
Wet wells need energy to raise water to holding temperature. More water creates a larger startup load and may require a longer heat-up period.
What is demand factor?
Demand factor adjusts connected load for expected simultaneous use. Use a conservative value when service is heavy, continuous, or not yet fully defined.
What duty cycle should I enter?
Use the percentage of time the heaters are expected to draw power while operating. Busy buffet service often needs a higher duty cycle.
Why is breaker size only a guide?
Final breaker size depends on equipment listing, conductor size, temperature ratings, local code, continuous load rules, and the authority having jurisdiction.
Does this calculate hood sizing?
No. It estimates heat remaining in the room after hood capture. Hood airflow and fire protection must be designed from code and hood manufacturer data.
Can I use this for dry wells?
Yes. Set water volume and evaporation to zero. Then the calculation focuses on connected rating, standby loss, current, and energy use.
What does process load mean?
Process load estimates the energy needed for heat-up, evaporation replacement, and standby losses. It checks whether operating assumptions are realistic.
Can this replace an engineer?
No. It supports planning and estimating. Commercial kitchen work may require licensed design, equipment submittals, permits, and inspections.
Why does phase affect current?
Three phase power shares load across conductors. For the same kilowatt load and voltage, it usually produces less line current than single phase power.