Just let me add this...We have a 1996 coach with the Webasto system, the predecestor to the aqua hot(pretty much the same components). Being in So Cal..never used it much and one day about 8 years ago, it stopped working. While in Quartzsite I had it serviced for the first time in the 12 years Ive owned the coach. A simple reset switch had it fired right back up within 30 seconds, the nozzle was still in great shape, the fuel filter was not clogged. Long story short....after years of non use, it was still going strong....of course I had it serviced while I had the tech there.