I've never heard of a Salamander Heater, but if there's any sort of smell or fumes from them, my gut would be no. Birds are very sensitive to fumes. At the very least, make sure there's LOTS of ventilation. Are you sure your alpacas will need the extra heat?
If I posted anything, it was that you should make sure to have plenty of ventilation in your coop to avoid frostbite. Most cases of frostbite are caused by excess humidity freezing on their combs. Ventilation should be above the birds, of course, and definitely not blowing against them in these conditions.
Just as an additional note to this, internal laying is not the same as egg binding! I see that mistake made frequently.
Egg binding is when a fully-formed egg gets stuck somewhere along the oviduct and blocks the hen up. This can sometimes be helped along with a warm bath to relax the muscles. This is usually caused by an overly large egg. If the hen passes the egg, she can go on to lay normally as long as she doesn't have any more big eggs.
Internal laying is when eggs do not form fully and instead either drop into the abdomen or sit in the oviduct, as described above. This usually cannot be helped and leads to peritonitis and a lot of discomfort.
I have had four or five hens--one production Rhodie and several red sexlinks--come down with this. It's unfortunately very common in production breeds from hatcheries, specifically the ones that lay huge numbers of eggs in their lifetimes like sexlinks, white Leghorns, production reds, etc. The best you can do is try to make them comfortable. I have heard of people emptying the abdomen and treating with antibiotics, but I personally feel this just prolongs their suffering. By the time my birds reached the 'penguin-walk' phase of internal laying, I have put them out of their misery. That's my personal feeling on the condition, though.
