Can you leave a radiant heater on all the time?

I understand the convenience of having a radiant heater running constantly to maintain a cozy indoor temperature, but is it really SAFE or advisable to leave it on all the time? Are there any potential risks or drawbacks to doing so? Wouldn't it be more energy-efficient and cost-effective to use the heater only when necessary? And what about the heater's lifespan – could continuous use negatively impact its durability? As someone who values both safety and efficiency, I'm curious to know if leaving a radiant heater on all the time is truly the best option.