The fbh is a fantastic piece of winter kit - I wouldn't be without it.
I've got the optional Webasto timer and delay start control - so it's just like the central heating in the house.
I set it for 30 minutes before I am due to set off and the car windows are complete de-iced, the cabin is warm, and the engine is up to temperature, waiting for me as soon as I sit in.
No more scrapers or de-icers for me!
Running full blast it uses approx 250ml of diesel an hour.
I know the temp sensor is none too accurate - but generally on cold starts without any timer at temps less than 5 degrees the fbh comes on automatically to get the engine up to temp quicker - which means about 5 - 10 minutes in my case.
Below zero it can come on at any time as and when needed, even during a journey.
Folks who report the fbh running all the time or not switching off when the engine is up to temp perhaps just need a new sensor.
With the timer mine works like a truck night-heater - except that it auto-shuts down after 30 minutes maximum so not to drain the battery running the heater fan.
I love / use the fbh kit so much that I fitted one in my Sprinter van, also with a timer.
Singvogel.
