Case Study: Monthly Electricity Usage of a Water Dispenser in Pakistan
🧾 Objective
To determine the monthly electricity consumption (units) and cost of running a standard water dispenser in a typical Pakistani household or office.
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📌 1. Understanding the Types of Water Dispensers
| Type of Water Dispenser | Features | Average Power Consumption |
| Hot & Cold Dispenser | Heats and cools water | 500–700 watts |
| Cold Only Dispenser | Only cools water | 80–100 watts |
| Hot Only Dispenser | Only heats water | 400–500 watts |
| Compressor-Based (With Refrigerator) | Includes mini fridge | 600–800 watts |
⚙️ 2. Standard Assumptions for Case Study
- Type: Hot & Cold Water Dispenser
- Wattage: 550 watts average
- Daily Operating Hours: 10 hours/day (actual usage time when heating/cooling is active)
- Days in a Month: 30 days
- Electricity Cost in Pakistan: Rs. 35/unit (variable by region and slab)
📊 3. Monthly Electricity Consumption Calculation
Monthly Electricity Usage of a Water Dispenser in Pakistan
Formula:
Monthly Units (kWh)=Wattage×Hours per day×Days1000\text{Monthly Units (kWh)} = \frac{\text{Wattage} \times \text{Hours per day} \times \text{Days}}{1000}Monthly Units (kWh)=1000Wattage×Hours per day×Days =550×10×301000=1650001000=165 units per month= \frac{550 \times 10 \times 30}{1000} = \frac{165000}{1000} = 165 \text{ units per month}=1000550×10×30=1000165000=165 units per month
⚠️ Realistic Adjustment:
Water dispensers don’t run at full capacity 10 hours/day. They cycle ON and OFF, so actual usage is ~30–50% of rated time.
Adjusted Monthly Units=165×0.4=66 units/month (approx.)\text{Adjusted Monthly Units} = 165 \times 0.4 = 66 \text{ units/month (approx.)}Adjusted Monthly Units=165×0.4=66 units/month (approx.)
💰 4. Monthly Cost Estimate
Electricity Bill=Units×Cost per Unit=66×35=Rs.2,310/month(approx.)\text{Electricity Bill} = \text{Units} \times \text{Cost per Unit} = 66 \times 35 = Rs. 2,310/month (approx.)Electricity Bill=Units×Cost per Unit=66×35=Rs.2,310/month(approx.)
📉 5. Comparison: Compressor vs Thermoelectric Dispensers
| Type | Monthly Units | Monthly Cost |
| Compressor-Based | 60–70 units | Rs. 2,100–2,450 |
| Thermoelectric | 35–45 units | Rs. 1,225–1,575 |
✅ 6. Factors Affecting Electricity Consumption
- Climate: Hot weather increases compressor run-time.
- Usage: Higher usage = more heating/cooling cycles.
- Maintenance: Dirty coils or filters reduce efficiency.
- Location: Placing dispenser in sunlight or heat source increases consumption.
💡 7. Energy Saving Tips
- Switch off at night or when not needed.
- Use timer plug to auto shut-off.
- Keep the dispenser in a cool, shaded place.
- Regularly clean internal parts and coils.
📌 8. Summary Table
| Description | Value |
| Type Used | Hot & Cold |
| Rated Power | 550 watts |
| Operating Hours | 10/day (real use ~4 hours) |
| Monthly Units | ~66 kWh |
| Monthly Cost | Rs. 2,310 |
| Lifespan | 5–8 years |
| Brand Examples | Dawlance, PEL, Homage, Gree |
📍 9. Conclusion
A typical hot & cold water dispenser in Pakistan consumes approximately 60–70 units/month, costing around Rs. 2,000–2,500, depending on usage habits and brand efficiency. For large offices or frequent users, this cost can increase, but energy-saving methods can reduce the monthly impact significantly.
