Here is a picture of the hot boxes I made. Please credit Brad Rill, Hampstead with the idea. A heat lamp is mounted inside at the top with the wire pulled through the opening of the 55 gallon barrel. The hole size is 9" wide and 14" high.
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During the recent cold snap, I found that I could put the wet lamb inside and the mother could finish licking the lamb. I found that a 125 watt bulb was sufficient. When temperatures got below zero, one may have to use a 250 watt bulb. I found that a 250 watt bulb got almost too warm and caused the lambs to leave.
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I pulled the barrels out when the temperatures rose or after a couple of days.
Submitted by John Hall, a Suffolk sheep breeder from Chestertown, Maryland.