Large portable generators can run most of a house through a transfer switch, often including a central air conditioner, an electric water heater or a well pump alongside everything else, and many add a 14-50R outlet for a 50 A RV or a 50 A inlet. They burn a gallon of gasoline an hour or more under load, so a big tank and a propane or natural gas option matter more here, and at 200 lb or more they stay where they’re parked.
Prices were last checked October 28, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Full ranking 25
- DuroStar DS13000MXT#1 of 25Full review
A budget large tri-fuel generator for homes with a natural gas line that want whole-house backup through a 50 A transfer switch, trading some build quality for a much lower price.
Amazon $999$99910,5008.5Tri$0.10 - Westinghouse WGen10500TFc#2 of 25Full review
A large tri-fuel generator that can run most of a house through a transfer switch on gasoline, propane or a natural gas line. Best for homeowners with a gas line who want long outages covered without refueling.
Amazon $1,249$1,24910,5009.5Tri$0.12 - DuroStar DS13000MX#3 of 25Full review
A budget large dual-fuel generator for whole-house backup through a 50 A transfer switch, trading some build quality for a much lower price.
Amazon $899$89910,5008.5Dual$0.09 - Generac GP9500E Tri Fuel#4 of 25Full review
A large tri-fuel generator for whole-home backup through a transfer switch, best for homes with a natural gas line. It is one of the cheapest ways to get 9,500 W and three fuels.
Amazon $1,169$1,1699,5009.5Tri$0.12 - Westinghouse WGen10500DFc#5 of 25Full review
A large dual-fuel generator for whole-home backup through a 50 A transfer switch, with remote start and CO shutoff. Good value per watt for homeowners who can do without natural gas.
Amazon $1,099$1,09910,5009.5Dual$0.10 - Westinghouse WGen11500TFc#6 of 25Full review
A large tri-fuel generator with cleaner-than-usual power for whole-home backup through a 50 A transfer switch. Best for homeowners with a natural gas line who want to run electronics safely.
Amazon $1,499$1,49911,5009.5Tri$0.13 - DuroMax XP13000HXT#7 of 25Full review
A large tri-fuel generator for homes with a natural gas line that want whole-house backup through a 50 A transfer switch without hauling fuel.
Amazon $1,499$1,49910,5008.5Tri$0.14 - Westinghouse WGen9500TFc#8 of 25Full review
A large tri-fuel generator for home backup through a 50 A transfer switch, for homeowners with a natural gas line who want to run as long as the outage lasts. Costs little more than the dual-fuel WGen9500DFc.
Amazon $1,149$1,1499,5008Tri$0.12 - Westinghouse WGen11500DFc#9 of 25Full review
A large dual-fuel generator with clean power and remote start for whole-home backup through a 50 A transfer switch. A good fit for homeowners without a natural gas line who want more than 10,000 W.
Amazon $1,349$1,34911,5009.5Dual$0.12 - Champion 12,500-Watt Tri Fuel#10 of 25Full review
A large tri-fuel generator for whole-home backup on a natural gas line, where it can run for days. Less suited to gasoline-only use, where it burns through a tank quickly.
Amazon $1,259.99$1,259.9910,0008Tri$0.13 - Generac GP9500E Tri Fuel EFI#11 of 25Full review
A large tri-fuel generator with fuel injection for whole-home backup, and the version to buy in California. Elsewhere the carbureted GP9500E does the same job for less.
Amazon $1,399$1,3999,50010.5Tri$0.15 - Westinghouse WGen9500DFc#12 of 25Full review
A large dual-fuel generator with remote start and a 50 A outlet for home backup through a transfer switch at a low price per watt. Buyers who want longer run time per tank should look at the 9.5 gal WGen10500DFc.
Amazon $1,049$1,0499,5008Dual$0.11 - Champion 11,500-Watt Dual Fuel#13 of 25Full review
A large dual-fuel generator for backing up most of a home, central air included, through a transfer switch. Its 14-50R also suits 50 A RV owners.
Amazon $1,159$1,1599,20010Dual$0.13 - DuroMax XP13000HX#14 of 25Full review
A large dual-fuel generator for running most of a house through a 50 A transfer switch, with cleaner power and a longer warranty than the XP13000EH.
Amazon $1,399$1,39910,5008.5Dual$0.13 - Pulsar G12KBN#15 of 25Full review
A large dual-fuel generator for feeding a 50 A transfer switch, and one of the few this size sold in California, though it lacks CO shutoff.
Amazon $929.99$929.999,50013Dual$0.10 - DuroMax XP13000EH#16 of 25Full review
A large dual-fuel generator for running most of a house through a 50 A transfer switch at one of the lowest prices per watt in its size.
Amazon $1,299$1,29910,5008Dual$0.12 - DuroMax XP15000HXT#17 of 25Full review
A very large tri-fuel generator for whole-house backup through a 50 A transfer switch, with a big tank for long runs on gasoline between refills.
DuroMax $2,599$2,59912,00012Tri$0.22 - FIRMAN T09275#18 of 25Full review
A large tri-fuel generator for homes with a natural gas line that want transfer-switch backup without storing fuel, at a premium price.
Amazon $1,707.66$1,707.669,20011Tri$0.19 - DuroMax XP12000EH#19 of 25Full review
A large dual-fuel generator for running most of a house through a 50 A transfer switch, sold at a low price per watt.
Amazon $1,299$1,2999,5008Dual$0.14 - Pulsar G15KTN#20 of 25Full review
A large tri-fuel generator for whole-house backup through a 50 A transfer switch at a mid-range price, though Pulsar publishes few of its specs.
Amazon $1,299$1,29912,000-Tri$0.11 - Westinghouse WGen14500TFc#21 of 25Full review
A very large tri-fuel generator for running a whole house, central air included, through a 50 A transfer switch. Best for homeowners with a natural gas line who want standby-like power without a permanent install.
Amazon $2,699$2,69914,5009Tri$0.19 - Westinghouse WGen9500DF#22 of 25Full review
A large dual-fuel generator for whole-home backup through a 50 A or 30 A transfer switch. Worth it only at a clear discount to the newer CO-sensor models, since it lacks CO shutoff.
Amazon $999$9999,5008Dual$0.11 - Westinghouse WGen20000TFc#23 of 25Full review
A huge tri-fuel generator that can back up a large home in full, wired in by an electrician or through two 50 A outlets. For buyers who want standby-generator output without a permanent install.
Amazon $3,899$3,89920,0008Tri$0.19 - DuroMax XP15000HXT+#24 of 25Full review
A large fuel-injected tri-fuel generator for whole-house backup through a 50 A transfer switch, and one of the few this size that California buyers can get.
Amazon $3,499$3,49912,00010Tri$0.29 - Honda EB10000#25 of 25Full review
A commercial generator for contractors and rental fleets who run it every day and need it to last. For home backup, consumer tri-fuel models deliver the same power for a fraction of the price.
Amazon $5,999$5,9999,0007.9Gas$0.67
