When I first turn my plate on without the dimmer, I let it heat up and get an idea of how hot it is to the touch. Since they have to be able to touch the plate, I go by the feel.
If I'm not able to put my hand on it and keep it there without it being too hot, I use the dimmer to regulate it over a couple hours time to be sure it is not going to burn a chick or cause a chick to avoid touching it.
Then it is set low enough that they can get up against it without harm.
I think what @aart is saying is very key. It doesn't really heat the ground underneith, it is something that they have to snuggle up against and they also snuggle up against their hatch mates. If they can't touch it - either because it it set too tall or because it is so hot that they avoid it, then it won't work as designed to work.
Since the unit is designed and sold in the UK with a heat regulator cord (similar to a lamp dimmer), I'm not sure why they haven't developed one that runs on US current. Using them without a heat regulator has the potential to cause problems. They seem to ship with a wide variation in temperature at the direct plug-in state. Some folks find they are regulated pretty well; others have them come so hot you can't keep your hand resting on it comfortably. Mine was one that came regulated quite hot at direct plug-in temperature.
I did contact the manufacturer several times over the last couple of years to see if they were going to produce the heat regulator for US. The answer is always the same...maybe they will but it's not in the plans.
Therefore, I use the dimmer cord as it accomplishes the same thing.
I hope that helps for some folks that have had problems with theirs.
This is similar to the dimmer I use. Mine came set hot enough that I usually have to keep it at 1/2 on the dimmer or less. Even when I use it in the barn in relatively cool spring temperatures. There's another advantage to using the temperature controller - you can decrease the heat if the weather is very warm or up it as needed. Can also decrease as they grow to still give them a warm place to go under, but it isn't so warm that they avoid it altogether.
https://www.menards.com/main/electr...l-led-plug-in-lamp-dimmer/p-1444438507478.htm
If I'm not able to put my hand on it and keep it there without it being too hot, I use the dimmer to regulate it over a couple hours time to be sure it is not going to burn a chick or cause a chick to avoid touching it.
Then it is set low enough that they can get up against it without harm.
I think what @aart is saying is very key. It doesn't really heat the ground underneith, it is something that they have to snuggle up against and they also snuggle up against their hatch mates. If they can't touch it - either because it it set too tall or because it is so hot that they avoid it, then it won't work as designed to work.
Since the unit is designed and sold in the UK with a heat regulator cord (similar to a lamp dimmer), I'm not sure why they haven't developed one that runs on US current. Using them without a heat regulator has the potential to cause problems. They seem to ship with a wide variation in temperature at the direct plug-in state. Some folks find they are regulated pretty well; others have them come so hot you can't keep your hand resting on it comfortably. Mine was one that came regulated quite hot at direct plug-in temperature.
I did contact the manufacturer several times over the last couple of years to see if they were going to produce the heat regulator for US. The answer is always the same...maybe they will but it's not in the plans.
Therefore, I use the dimmer cord as it accomplishes the same thing.
I hope that helps for some folks that have had problems with theirs.
This is similar to the dimmer I use. Mine came set hot enough that I usually have to keep it at 1/2 on the dimmer or less. Even when I use it in the barn in relatively cool spring temperatures. There's another advantage to using the temperature controller - you can decrease the heat if the weather is very warm or up it as needed. Can also decrease as they grow to still give them a warm place to go under, but it isn't so warm that they avoid it altogether.
https://www.menards.com/main/electr...l-led-plug-in-lamp-dimmer/p-1444438507478.htm