Frogmogman
Well-known member
I had a webasto and eberspacher, one was diesel and the other LPG (i foget which was which), the LPG never needed servicing as it was so clean burning but the diesel needed a quite expensive de-coking after a few years heavy use. A coal fire would just need sweeping out I guess.
You can de-coke these heaters by running them on Kerosene (paraffin), although opinion seems divided as to whether running on kerosene the whole time is a good idea.