Slightly off topic, but here is a tip for all of you with torpedo type forced air heaters that run on kerosene or diesel. when they get to be a couple of years old the air pump loses efficiency, the fuel pick up pressure drops, and they start to burn cold, and become smelly and smoky. I had this problem with mine, and fitting new vanes to the air pump did not cure it. In the back of the heater where the air intake filter is, you will see a small plug which is the test point for the air pump. If you remove this plug and connect a low pressure regulated air line to this point, you can adjust the air pressure to obtain the perfect smell and smoke free burn. Beware! they only need between 5 and 9psi, and you can tell when the burn is correct by looking at the hot end, the outer part of the hot dome should be red hot, the centre should be slightly cooler and darker, if the centre is red hot, too much pressure, turn it down! My Master brand Torpedo heater has been running like this since about 1978, and with an annual strip and clean, has required no spare parts, and still runs clean and hot. the pressure air pump is definitely the weak link on these heaters, and looking at a manual for these heaters a few moments ago, they have not really altered the design. If you have one in the back of your shop collecting dust, whilst you shiver, get it out and try this mod, it works! also, do not fail to clean out the fuel pick up filter as this also causes problems, sometimes fitted inside the pick up pipe.