Question: Can an extension be added to my stove to give me more fuel storage and run time between refueling?
Answer: In most cases, yes. We offer hopper extension addons for many of our stove models.
For the HP21, HP22, and HP61 models, this extension will fit: https://comfortbilt.net/products/comfortbilt-hopper-extension
For the HP50s model, this is the correct extension: https://comfortbilt.net/products/comfortbilt-30lb-hopper-extension-for-the-hp50
There is not currently a hopper extension available for the HP22N or HP22i models.