Chinese diesel heater: an inexpensive imitation of a brand-name diesel-burning air or water heater. There you go, summerized
I've been running mine for about 10-15 minutes once a month. I haven't heard a satisfactory answer to your question, so I've been assuming that getting it up to full blast every now and then will keep it primed and keep any critter nests out of the exhaust pipe. Interested to hear if there is an official "summer-izing" procedure. Maybe Eberspracher/Espar have it spelled out somewhere?