For example, a 100-gallon tank holds 80 gallons of propane. ... but expect to pay $25 to $200. Support. Above-ground tanks are required to be placed on concrete or other non-combustible pads.

Champion 14-kW aXis Home Standby Generator with 200-Amp Whole House Switch. On Amazon . 4.3. ... recommends a minimum of a 250-gallon propane tank for their propane standby generators.