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Do these heaters get warm enough to start a fire if laid in an area with straw though? I rake the straw up every evening - and they spread it out every day ....
On the upside - I should have some amazing compost this spring!
I think it depends on your design. Lots of things effect how hot the outside gets...size of tin, style, wattage and mounting of bulb, thermostat....
Mine only puts out heat from the top. I used a popcorn tin, mounted the bulb in the center bottom and used a thermostat. I did put a square metal plate underneath for a good base, but I don't think it's really necessary for fire protection. The sides/ bottom don't get even warm before the thermostat kicks the light off. So the only part that gets warm is the top which is covered completely by the waterer. The waterer is weighted and secured to the side of the coop. Think cheap lampshade. It doesn't burn up because there's enough distance from the bulb on the sides and all the heat goes out through the open top.
Several people are using them also for warmers in their coops right on shavings. My guess is that they are using small wattage bulbs and big enough tins that their outsides are just barely warming.
Test it out inside first and see where it heats up and just how hot. That's what I did.
There's some details lacking in this guys vids, but he has some great ideas. I'm thinking of making one of his brooder warmers. Plenty of experience with broodies and their chicks outside in cooler weather and I know he's right. No reason to have all the heat and light, just need a warm place to snuggle when needed.
http://cmfarm.us/cookietin.html