C22O CDi diesel heater unit

Hi,
My C220 CDi Estate has a small unit located in the O/S lower front wing area which is fed by water and diesel oil and the top aluminium pipe to it has
corroded through.
I think this unit is a diesel burner to heat up the car before the engine reaches temperature.
Anyone know if this unit is easy or difficult to replace?
Thanks,
Griff.
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