How long do oil filled radiators take to heat up?
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evorad.jpg. An oil-free radiator will also warm up a room faster than their oil-filled equivalents. In tests a Dimplex 2kW EvoRad2BTA warmed a room from 9°C to a toasty 22°C 11 minutes and 57 faster than a leading manufacturer's 2kW oil-filled radiator – that's 17% faster.