Does anybody know which heaters to recomend putting i when using bioiesel i wastold that idid not need one but was going to install as a cautionary measure as the bio diesel froze in my suppliers tank the the other day ive been looking at two types the one which runs a 12 v supply and presumably has a small heater inside goes onto the fuel line before the filter and the one which runs through the cooling system which one is the best surely the cooling system version would only work ones the coolant got hot defeating the point can anyone throw some advice my way cheeers Dan