For it to be effective, you pretty much will have to run it anytime the
engine is not running.

In 20 degree weather, place a 1,500 watt heater in the van and see how
long it will take to warm the van. Now plan to heat the coolant in the
engine with the same amount of heat. 1,500 watts is a little over 5,000
BTUs. You are not going to heat the coolant and the van by turning this on
an hour before you want to use it.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Miguel Pacheco
Sent: Wednesday, February 20, 2008 12:25 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Retrofit Electric Pumps and a 110V pre-heat circulating
system

Come on, put it on a timer. You don't have to run it 24/7!

Thanks,
Miguel