I have been fortunate and bought a Whitfield Quest pellet stove in 1996 that is still my main heat source for the house. In its 15 yrs, it has gone through 2 auger motors and 1 convection motor. Blower motor may last 1 more season.
As previous posters have noted, pellet stoves require maintenance and directly impacts the units longevity. I burn approximately 3 tons of pellets a year and have been using Blazers from Home Depot.
Dave
I buy pellets directly from the manufacturer or in a large quantity if I can find them as follows...
Most important... They need to be PFI (Pellet Fuel Institute) rated as premium hardwood pellets, however, that don't mean that they will be suitable for your application as all pellets that are certified aren't creared equal (as I've found out over the years).
It still takes some experimentation to determine what burns best, with the least amount of ash, in your particular unit, because, while all units combust and extract heat, they all do it in different ways, utilizing different methods.
I've even seen pellets that burn good one winter, burn like crap the next because the material content changed at the mill. Remember pelletized wood fibre is a waste product, hammermilled and extruded wood fibers so it all depends on the material content prior to hammermilling, as to what the end product will burn like.
Pellet manufacturers can be looked at like a scrap yard for wood. The pellet manufacturer takes in wood scrap whether its saw log parts, scrap wood skids, scrap flooring from a flooring mill or scrap dimensional lumber from a manufacturer and processes it into pellets, bags them, skids them and sells them to stores (and you if you can buy a large enough quantity).
Because my neighbors all have bio-fuel appliances and I own a fork lift and have unloading capabilities, I try to buy quantity, direct from the pellet manufacturer. Most times, that entails a truckload, 22 skids at 2,000 pounds a skid but the price is apppreciably less, even factoring in transportation.
I can typically negotitate a per skid price 25-30 percent lower than any sale price on full skids, plus the manufacturer likes truckload sales because there is less handling for them.