Dishwasher vs Hand washing
Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.
Full loads daily, large households, anything requiring sanitisation (baby equipment, chopping boards).
Single items, delicate glassware, sharp knives, non-dishwasher-safe items, smaller households.
| Aspect | Dishwasher | Hand washing |
|---|---|---|
| Water per full load | 9-12 litres | 27-75 litres |
| Time | 3-5 min load/unload + 1-2h run | 20-30 min washing |
| Energy | 0.9-1.2 kWh per cycle | Minimal (hot water energy only) |
| Sanitisation | 60°C+ kills bacteria reliably | Varies with water temperature |
| Annual cost (UK avg) | ~£70-120 (energy + water) | ~£150 (hot water energy) |
Frequently asked
Is it cheaper to use a dishwasher or wash by hand?
For full loads, a modern dishwasher is typically £30-80/year cheaper in water costs than hand-washing. Energy costs are comparable. The time saving — roughly 4 hours/week — is the biggest argument.
What shouldn't go in the dishwasher?
Sharp knives (dulls the edge), cast iron (removes seasoning), wooden items (swells and cracks), delicate crystal, non-stick pans (degrades coating), silverware (tarnishes), handpainted ceramics. Anything marked 'hand wash only'.
Frequently asked questions
Is it cheaper to use a dishwasher or wash by hand?
For full loads, a modern dishwasher is typically £30-80/year cheaper in water costs than hand-washing. Energy costs are comparable. The time saving — roughly 4 hours/week — is the biggest argument.
What shouldn't go in the dishwasher?
Sharp knives (dulls the edge), cast iron (removes seasoning), wooden items (swells and cracks), delicate crystal, non-stick pans (degrades coating), silverware (tarnishes), handpainted ceramics. Anything marked 'hand wash only'.