SOURCE: Vulcan freeloader hot water heater
Could be moisture in the gas supply line - get your gas fitter to purge the line at the meter.
SOURCE: Pilot light won't stay lit
Look for dust and lint. Look for them in places where gas should be freely flowing. I had a similar problem with an Empire Corcho wall-mounted propane ceramic catalyst heater. First it was the pilot light, then the #2 ceramic mantle. After horsing around with the gas lines and pressure regulators and trying to re-aim the pilot, it all turned out to be dust and lint in the gas passages. A little dust bunny in the brass pilot tube gave me a pilot light the shape and color of a banana. One puff of compressed air, and I got back my razor-sharp pilot. And some dust in the chimney of the #2 burner kept it burning blue/yellow and blistering paint off the upper surfaces of the heater. A bit of cleaning with a shop-vac put that right. "Passive" heaters are very much prone to this sort of problem because they rely on convection currents (i.e. LOW velocity) to get the job done. Convection currents are notorious dust collectors, as in COBWEB CITY.
SOURCE: I have an old 20years probably Vulcan gas heater.
Probably an extreme amount of air entered the line, and it takes a long time to bleed all that through a pilot. Have you tried running other gas appliances in the house first? Try a little longer.
If no luck, call whoever worked on the lines and ask them to send a gas technician over, as it was working fine prior. They may have to bleed the line at furnace, but should be done by certified gas technician, and they shouldn't charge you for it.
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