“The hopper extension was the greatest thing I've bought for my HP 21 now I have to fill it less. This has been a great heater. I've had it for a while as long as you clean it it will give you good heat.”
“This fixes two of the biggest issues with the HP22 by allowing the hopper to fit more than a 45lb bag of pellets and safely disabling the lid switch. These fixes have substantially reduced our "low temperature" errors by keeping the fire fed consistently. It could be slightly bigger.”