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Waste oil has several problems as a heating fuel source. Contaminants and variable viscosity are the most obvious. There are many vendors of these heaters. Reznor seems to be the most common around here. Check around gas stations and airport maintenance hangars, and I'll bet Reznor is what you'll find. Anecdotal reports say that many of the commercial burners need more tuning and maintenance than #2 fuel oil home furnaces, regardless of the vendor. A good water elimination and filter arrangement should be an absolute requirement with these, especially if the waste oil tank is open for all to use. The various vendors universally provide pre-heating of waste oil. Some provide injected compressed air for improved atomization. Some provide constant flow pumps, instead of pressure regulated. Kagi touts his air-accumulator soft-start feature, which I've not seen elsewhere. But he doesn't talk about the other features. Are they needed? Perhaps not, if you try to keep the viscosity in the feed tank reasonably balanced, and not varying wildly from kerosene one day to 90W-120 crankcase oil the next. Keep the feed tank cut with 50 % #2 diesel, and probably all of them will work better, and still save you (some) money.
Most home fuel oil burners have flame retention tubes. Is stainless steel necessary? I doubt it.
A lot depends on your tolerance for fiddling with it, who fills the waste oil tank, the variability of the incoming waste oil stream, and who maintains the system when it breaks. If you want it to be "plug it in and forget it", better check on the service capabilities of the seller or the local reps. If you are willing to tweak it, perhaps every time you change the mix in the waste oil tank, then probably any of them will work OK. By the way, many of the people that have actually built the "Mother Earth" burner say they've gone back to dripping waste oil on the woodstove fire, in disgust over the constand fiddling with the "mother's burner".
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