I received a 2.6L hot water bottle for christmas and used it to heat my bed last night. it rocks. makes the bed very cozy and is still warm in the morning. very nice radiant heat.
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@dthompson what temperature of water do you put in it? Does it have a cover or other insulation to slow the heat dispersal?
@keverets I am using boiling water. it has a thick plastic case and a blanket-like bag that it goes into. when I touch the bag it is very warm but not dangerous.