I noticed on overnight pellet stove burn, I was eating up 1/2 to 2/3 of a bag, depending on how long I sleeped & waking up to an 80 to 84 deg house.
Now, while I truely enjoy a warm house in the morning, not so much at the expense of 3/4 of a bag of pellets.

so, I looked into a wall thermostat for my pellet stove & the mfg told me that the thermo will cause the auto ignitor to prematurely fail on a yearly basis & at a cost of $90.oo +ship+handling+tax+installation fees.

This is because with the Tstat set for off/on opperation ,the ignitor goes through 10 to 16 off/on cycles a night vrs just once or twice per night on manuel opperation.

The normal life of the ignitor on manuel is 5 years or 1 year on Tstat opperation.

SO THE ANSWER IS TO ONLY KEEP 1/5 TH OF A BAG OF PELLETS IN THE HOPPER & run the pellet stove on manuel.

1/5 th of a bag will run my stove for 3 to 4 hours,depending on the feed rate I set & then the stove shuts itself off when it runs out of pellet fuel.

my house gets up to 84 degrees & then spends another 4 hours or longer cooling off to 70 deg

I wake up to a 70 deg house, slept warm all night & it only cost me 1/5 th bag of pellets
did not have to spend 180.oo for a wall Tstat or 90.oo+ for a new ignitor every year.

your pellet stove will differ from mine.
different feed rates and btu/hr
Your area to be heated
& your house’s insulation
& the outside temp will all factor in.

You will either need fewer or more pellets in the hopper for a comfortable overnight.

With a little trial & error, you will get it down pat & save 25% or better off of your pellet useage.

Try this & save yourelf some $$$

Signature I;m no expert,just a knowledgeable amateur.But,I’m Close to an expert,as he lives just next door! GRAND POOBAA OF THE PELLET PIGS! WOOD STOVE primary heat 12.0cu.ft.FireBox- 1/4 plate steel,1970’s. 150k-btu.DIY converted to secondary burn technoligy,by me! summersheat M#50-snc30lc @ lowes ,2000 sq ft,3.5 ft FireBox& sec.air . PELLET STOVE for secondary heat, PEL-PRO by Dannon Group Ca. 50kbtu PELLET STOVE.—2hp,4ton elect spliter,22 ton huskee splitter 6.5HP-b&s;——Chain saws 4 gas ,4 electric.4’x8’ trailer,3 woodsheds.free wood scrounger.