Hi guys/galls, my van was built in 1999 so I guess that's the age of the heater...it's basic, pietzo manual start. I can get the flame in the 'viewing window's but not for long. The radiator with the grey heatsink type fins barely gets slightly warm, not hand hot at all...and then it goes out. I believe I am to hold the gas button down for a while which I have done. But it goes out. It's got a new bottle of gas and all gas taps are on. Can anyone throw any 'light' on the heater?. Thanks