Microwave Wattage and Size: What You Need to Know
By Home & Kitchen Appliances – Morphy Richards UK | Published: 2026-10-24
Category: Product Reviews
Learn how microwave wattage affects cooking speed and reheating quality, and how to choose the right size for your kitchen countertop. Practical advice for everyday use.
Quick answer
Higher wattage means faster, more even cooking, but for most reheating and defrosting tasks, an 800W microwave like the Morphy Richards Shadow 20L offers reliable performance with a compact footprint.
Why wattage matters more than you think
Microwave wattage directly determines how quickly food heats. A 700W microwave will take longer to reheat leftovers than an 800W or 900W unit, and it may not cook frozen meals as evenly. Most recipes and frozen food instructions assume an 800W microwave, so sticking close to that power level makes everyday use simpler.
Size trade-offs: counter space vs. capacity
A 20L microwave fits neatly on most countertops without dominating the space, but it may not accommodate large casserole dishes or a whole chicken. If you frequently cook for a family, consider a larger capacity—but measure your available counter space first to avoid a tight fit.
Frequently asked questions
- What microwave wattage is best for home use?
- 800W is a versatile sweet spot. It handles frozen dinners, reheating, and defrosting consistently without being too slow or too power-hungry.
- Does higher wattage always mean better cooking?
- Not necessarily. Higher wattage can cook unevenly if you don't adjust time and power levels. For most people, 800W to 900W provides excellent results without fuss. Choose an 800W model for a balance of speed and control.
- How do I know what size microwave fits my counter?
- Measure your countertop depth and width in inches. A 20L microwave typically requires about 18 inches of width and 12 inches of depth. Leave at least 3 inches ventilation space on sides and back.
- Can I use a lower-wattage microwave for baking or grilling?
- Standard microwaves are not designed for baking. If you want grill functions, look for a microwave that explicitly includes a grill feature.
Product facts
- Shadow 20L 800W Manual Microwave - Grey: The Morphy Richards Shadow 20L 800W Manual Microwave features a durable chrome handle and mirrored glass door. The mirrored door adds a modern look while the chrome handle offers reliable daily use for reheating and defrosting.
Shadow 20L 800W Manual Microwave - Grey
