Hmmm, I don't know if the heating effects the filter but I'd definitely be weary if it has ptfe. Another thing about that model is, I think, there are big enough holes at the base for a talon to get caught if your birds are the adventurous type to cling onto it. My bird is crazy and would do something like that.
Have you considered an oil filled radiator? Those have been discussed as bird safe here on the forums many times.
