Some advice on infrared heaters please.

[HappyHippyDad]

One point I forgot to mention is how these panels are attached to the wall/ceiling. If the current method is the same as when I installed them, you do have to be careful that the ceiling/wall is completely flat.
Not so critical on wall mounting, but that's because you can generally see behind them from above, but locating them on a ceiling is trickier.
Basically, there is a bracket you fix to the ceiling, and for plasterboard the usual hollow anchors are ideal as the panels are not heavy. Once the bracket is in place, lugs on the back of the panels engage with slots on the brackets, and you slide one way, then at right angles to lock in place. removal means reversing that procedure, so it is best to mount all the brackets in the same orientation, so that to install it's up, push left, slide back...or what ever works for your fitting. Thus, the bracket has to be completely level or one or more of the lugs won't engage in the bracket. I had only 2 out of 12 where the ceiling was slightly bowed, so simply used shims, you know, those plastic ones that come in various sizes in a bag of 500 for a few quid. A spirit level across the bracket will confirm when it is "true". Trying to see the lugs when your face is squashed against a ceiling is not easy! Also, if you make them all the same orientation, it's easy to stick a discreet label on one edge of the panel saying "Slide to left, then pull" or whatever.
So far we haven't had to remove any of the panels, so the above advice comes simply from my "dry run" at first installation. A small point, but hopefully of help. Finally, when installing the bigger panels, it's so much easier with 2 people.

Thanks Pirate, some really useful info.