Room Heater Electricity Cost Calculator
Room heaters are the biggest winter bill shock in Pakistan. Enter your heater wattage, daily usage hours and days per month. The calculator adds the heater units on top of your existing usage and applies WAPDA and DISCO slab rates to estimate the real monthly cost.
Check the sticker on your heater. Common sizes: 1000, 1500, 2000 watts.
Your normal bill units before winter. Heater units push the total into higher slabs.
Protected consumers get lower rates but lose the status if usage crosses 200 units for 6 months.
| Result | Value |
|---|---|
| Heater monthly units | — |
| Heater monthly cost (extra on your bill) | — |
| Heater cost per day | — |
| Total bill units (existing + heater) | — |
| Estimated total monthly bill (energy charges) | — |
Enter the values above to see your heater cost breakdown.
WAPDA and DISCO domestic slab rates (reference)
Rates in Rs per unit (kWh). These are the commonly notified reference rates; your bill may include taxes and surcharges on top. Verify exact rates on your latest bill.
| Monthly units slab | Non-protected (Rs per unit) | Protected (Rs per unit) |
|---|---|---|
| 1 – 50 | 23.59 | 9.93 |
| 51 – 100 | 23.59 | 13.34 |
| 101 – 200 | 30.07 | 30.07 |
| 201 – 300 | 34.06 | 34.06 |
| 301 – 400 | 39.15 | 39.15 |
| 401 – 500 | 41.36 | 41.36 |
| 501 – 600 | 42.78 | 42.78 |
| 601 – 700 | 43.92 | 43.92 |
| Above 700 | 48.84 | 48.84 |
Tips to cut your room heater cost
- Heat one room only and keep the door closed. Heating the whole house wastes most of the energy.
- Run the heater 2 to 3 hours to warm the room, then switch it off. Rooms hold heat for a while if windows and doors are sealed.
- Use the thermostat at a medium setting instead of full power. Full power mostly wastes electricity.
- Seal gaps under doors with a door draft stopper and close curtains at night to keep heat inside.
- Place the heater near where you sit, not in the middle of a large empty room.
- For mild cold, a thick sweater and warm bedding can replace the heater on many nights.
- Oil-filled radiators and fan heaters with timers let you warm a room before bedtime and switch off automatically.
Common questions
- How many units does a 2000 watt room heater use per month?
- A 2000 watt heater running 8 hours a day uses about 480 units per month (2000 ÷ 1000 × 8 × 30). On non-protected slabs this can add Rs 18,000 or more to the bill, since those units land in the higher slabs.
- Why does a room heater make the electricity bill jump so much?
- Heaters draw high power continuously, and the extra units push your total bill into higher tariff slabs where every unit costs more. This calculator adds the heater units on top of your existing usage to show the real extra cost.
- What is the difference between protected and non-protected slabs?
- Protected domestic consumers using under 200 units a month pay Rs 9.93 for 1–50 units and Rs 13.34 for 51–100 units. Non-protected consumers start at Rs 23.59 per unit and pay up to Rs 48.84 per unit above 700 units.
- How can I reduce my room heater electricity cost?
- Heat a smaller room with the door closed, limit usage to 2–3 hours, use a medium thermostat setting, seal door and window gaps, and dress warm for mild cold nights.