[oil pan 4]

Hot water heater elements are designed to fail safely if they are over heated or ran dry.

The electric pump I use the primary engine coolant pump, not an add on. They have proved very reliable.

I originally lived on the east coast in Virginia, which had a climate kind of like what I have seen in southern England. (I had not have the pleasure of experiencing a winter in London). Other than that, I did like the weather aside from the copious amounts of rain.
Living on the eastern coast I didn't even think that this part of the country had a winter.
The winters in the high plains of New Mexico have been unbelievably harsh.

In this part of the country nights that get down to -10'C or lower are perfectly normal.

Preheating the car I was going to use a 2 fold approach.
In the U.S. small light duty low wattage items to include most appliances, tools and small space heaters use 120 volt power.
High power items like electric clothes dryers, electric hot water heaters, larger air compressors use 240 volt power.

The feeder plug I am going to use to supply power can handle 30 amps of 240 volt power and supplies both 120 and 240 volt power.
I will use hot water heater element for mostly just heating the engine and the space heater for inside the vehicle.
I have been using the space heater buy its self melt ice off the out side of the car and it works ok.
The hot water heater element is added in line with the heater core. So I can run the blower fan and get a little bit more heat, if needed.
In my 2008 test I used a 2400 watt coolant heater by its self and it was able to start melting away frost on mornings that were just below freezing in about a minute or two in this configuration.