Thermopile generator brands which is good?

[Shelbyjockey]

So I own a hotel and use a lot of propane heaters. Every now and then I replace these 750 MV thermopile generators. The price on these vary from 10 dollars to 50 dollars. Is there any particular brand that I should buy over the others. Im looking for a product that will last longer than a year or two, hopefully.

 

[Hisevout]

what about Mr. Heater?

 

[Diehard]

what about Mr. Heater?

What about them??