Another thing that people often point to as a negative thing about ketosis is that people can suffer symptoms such as headaches and dizziness in the first few days of a ketogenic diet. Also, athletic performance can suffer until the body adapts to using fat for energy instead of glucose.
Forced air furnace heat exchangers have an average life expectancy of 15 years, with a range typically between 13 and 20 years. Most heat exchangers used in models today today will last between 15 and 25 years and are usually made from aluminized or stainless steel.
This means that every hour the appliance operates on full heat you will use 1 pound of propane! 5kg's of propane is a little over 11 pounds and 13kg is about 28.5 lbs so they will last 11 hours and 28 hours respectively. If you turn the burners down at all from full heat you will extend the burn time somewhat.our question is flagged as US...but I wonder if you are in the UK or Europe. That would explain the different units of measure. Hope this helps! Source(s): 21 years experience in the propane business and a licenced gas fitter.