A ranking based only on wattage does not give you enough information to choose heating. First compare what you want to use a panel for, where it can be mounted and how you want to control the temperature.
Compare the right features
Consider power, dimensions, finish and permitted mounting. A mirror panel has different location requirements from a metal ceiling panel. Also check the matching thermostat and receiver so the controls suit your usage.
From comparison to a proposal
The calculators provide an initial estimate. For primary heating, multiple rooms or a commercial project, also discuss insulation, ventilation and operating hours. We help apply the product information to the situation you describe.