Would anyone know what exactly does the option of an engine block heater do?? And how does it work?? Can it be added if not purchased as an option when new??

 

I believe they warm the water in the block. They screw into a freeze plug hole. Then you plug it in. You can add them, but you might have to tap threads into the freeze plug hole. I think it pulls 600W. It may be of some use in Mass, but I don't think you'd need one. It's really for more northern areas -> Canada.

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I purchased my F-150 with a block heater factory installed in Alaska. The block heater assists your engine, especially lubrication, warm up quicker in extreme cold weather. It should only be plugged in about 1-2 hours prior to driving. Leaving it plugged in all the time during cold weather will cause the block heater to prematurely wear out. There are numerous aftermarket versions and easy to install.

 

I have a Ford block heater on my '95. In this area I don't need it but it still gets used on occasion. The only thing I don't like is that you have to plug it in an hour to an hour and a half before you want to go. As stated above, they recommend against leaving it plugged in all night.

I guess you could find a timer that would handle the wattage and turn it on for you in the morning.

The one I have will warm the water enough to cause a little circulation through the thermostat weep hole. The truck is up to normal temp very quicly after starting. I'm sure it could save some gas in the winter even in less than harsh conditions.