I'm looking into installing a block heater right now. im in charlottesville, VA so it does not get too cold but I would like to install one to have easy starts in the morning. I don't see myself putting a block heater on it after reading about all that is involved but the hose heater seems like a good alternative to me. Does the coolant circulate at all with one of these things though or does it just heat the stuff in the hose up?

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W126 1983 300SD 286,000 miles and ticking
Baby blue exterior Grey MB tex
Recent work:
Replaced air cleaner mounting brackets and heat shields
Replaced alternator, fan and power steering belts
Replaced positive battery terminal
Replaced negative battery terminal and cord
New Duralast Battery

My car needs work.