Long term pellet storage

Well, the big plastic baggie that the pellet companies put over the pellets seem to work well as long as it remains intact. Keep the pellets up off the ground on their pallets, and put them under a roof. Here's my Clean Fire's that have been stored for 2 winters (they're my "emergency stash").

pellets need to be kept dry. However it is done. I won't buy pellets that that I am aware of being stored outside. All too often, I've seen pellet done up in their plastic ton wrap wet with moisture. I think that large shifts in temps and moisture that that pellets stored outside are subjected to result in large amounts of condensation forming inside the wrapping. That moisture has to go somewhere. Pellets are very absorbent. I've seen large clumps of sawdust in those bags. Try to store you pellets somewhere dry and not exposed to repeated large sifts in temps. and moisture. Somewhere covered, off the ground and where the air can flow around them. I keep mine in my garage from year to year with no problems. Never an issue with bugs or critters.

This season and last season I tapped into some pellets
that I had purchased 4/5 years ago. They were stored
in my unheated garage. They burned as perfect as the
day I stacked them.

As long as they are kept dry and mice are not using them for bedding, I am sure their lifespan
could be quite long.

It is normal for me to have bags in my stockpile that are 2-3 years old by the time I get
around to burning them. They are just fine.

Pellets are basically woood.

If anyone has ever seen a 200 year old wood house catch fire I'm sure they'd notice that the attic rafters burn just as hot as the rest of the house. Once those old houses catch fire it's nearly impossible to put that fire out. This is even true of houses located on the humid US east coast.

A well vented attic is exposed to heat, cold and himidity year around - but not rain. As long as it is kept dry and away from pests (termintes, mice) the wood attic in these old houses lasts for ever. The heat and humidity is not an issue. And boy, does that wood burns good once it catches fire.

So, in my thinking, kept dry and away from pests, wood pellets should last forever independant of the humidity.

Take care

RonB