The block heater is in the right side of the engine, screwed into the water jacket. usually is 400 watts for the stock one.
there are oil pan heaters, some magnetic, and some pads that glue onto the pan.
Calif isn`t all fair weather in the winter. right now it is 44deg at 4am. and has been into 70`s this week. Jan, Feb and March can get into the low 20`s and once in a while the teens, but rarely here on the Monterey Bay. All depends where you live in Calif., my Daughter lived 3 1/2 hrs east of here in Sonora. said they are going to get 4 ft of snow this week end. that is a ski area higher up the hill from them.
Truckee, Ca. is a cold area up near lake Tahoe, that place is colder than a well diggers arse.
http://www.weather.com/weather/tenday/USCA1163 here is their 10 day weather. compared to ours
http://www.weather.com/weather/tenday/USCA1078
I have a block heater and pan heater, I don`t always stay home

. and sometimes use it when in Carson City, Nevada,south of Reno.
Charlie