I may not be the sharpest tool in the shed but I can see logic in preheating water and I by no means suggest that what I am going to suggest is correct?.but?.
I can agree that the conventional logic of having your mechanical thermostat regulate the temp of the water is a good one and therefore preheating your water would not be the best thing to do. This logic has been tried and true since the inception of the automobile and why change it?
For whatever it is worth I can see how the use of an electric water pump WOULD justify pre heating the water. Preheated water would prevent the electric pump from running on a full restricted load by the thermostat. In my limited experience with electric pumps I find it is hard on a pump to block its flow 100%?.. I feel that over time that running an electric pump under full restriction will eventually cause premature failure where as a crank driven pump does not care.
Something that would be interesting to try by someone using an electric water pump would be to remove the thermostat (this would increase the flow capacity and cooling ability) and install a variable temp switch in the water jacket. The variable temp switch would regulate the operation of the water pump as appose to a thermostat regulating flow, the flow would be regulated electrically. Not only would the cooling system be more efficient, it would be easier on the electric water pump but you could also on the fly regulate the temp of the motor by turning a knob. This could also eliminate the hands on procedure of turning the pump on or off?.it would do in automatically and be one less thing to do.
Longevity of the water pump may be a minor reason to preheat the water?.and regulating the water temp electrically as apposed to a traditional thermostat may be a waste of time with no real practical benefits??but that is no reason that someone using an electric pump should not do this??just not me?..but let me know how it works for ya!
