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Called parking heaters in Sweden and is common.
There are two kinds: electrical and fuel heaters, both heating coolant.
Fuel heaters also have electrical pump, to increase flow through heater core. Also activates HVAC blower at low setting.
Typically fuel heater will NOT increase fuel consumption because what it uses will be less than you gain in faster heat up. NOTE: any start up with less than 80 C, is a cold start.
It does heat up engine block - through coolant
Remote operation is allowed in Sweden and Germany, and I believe most countries.
Typically there is a preset time, so you just have to push one button to operate.
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