Do not disconnect tanks any longer than needed, And do one tank at a time, not both. I grew up with propane. We had like 5 100 pounders outside our kitchen window.. (might have been six) these provided hot water and kitchen stove.. NEVER did we have to re-light the water heater,, NOT once. Later we used Propane to heat other buildings, plus there was a 2nd house that used propane for cooking and hot water. Never had to relight a pilot due to air in the line. Never. Not in the roughly 20 years we lived there.. Oh we did have to relight from time to time, but that was when we accidently ran COMPLETLY out of gas and had to haul a bottle to a refill station till the delivery man came by with new tanks.. (He was an "On Call" Service, nto a "Same day every month" service).
Finally I will add that pilots are hard to re-light, this is on purpose. It is a safety issue. You have to hold the override button, while lighting the pilot, then continue to hold it for a good minute in most cases. sometimes longer. On some of the pilots I deal with even today (oven) that may not be enough.. Takes time for the pilot to heat the thermocouple so it generates enough CURRENT (not voltage) to get the magnet to hold the valve open.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times
