How Much Electricity Does a 100W Heated Waterer Use?
Formula
Watts × hours-on ÷ 1000 × $/kWh × 30 = $/mo.
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100W × 12h avg × 30 ÷ 1000 × $0.17 = $6.12/mo deep winter. Shoulder months half – thermostat off above 40°F.
| Unit | Est. mo |
|---|---|
| 40W belt | $2.45 |
| 60W | $3.70 |
| 100W | $6.10 |
| 125W | $7.65 |
| 250W | $15 if always on |
Measure with $15 plug meter to verify your on-time. See wattage, pillar.
Rate source
Use your $/kWh from bill – national context EIA, saving tips DOE.