Quartz grills preheat instantly (i.e. 12 seconds). These are ideal for cooking snack foods where you want immediate heat for pizza, sausages, cheese on toast, etc. Radiant grills heat in just 5 minutes but give out a black heat, i.e. very even and spread over a wider area. These give better heat for real cooked foods. Radiant grills are rated 1.5kW