fish-street.com make generators?
While waiting for my dentist google did show me a super cheap Harbor Freight one... probably wouldn't go there
And yeah I did some some Amazon "weird name" ones that had the same color scheme as major brands so yeah the Jebao of generators I'm sure.
Here's my view on it though
Watts: Enough to run the heaters and pumps, and with a few exceptions most will easily cover that, maybe enough to also run the fan on my furnace, not having heat made the house get fairly cold, and my wife says colder than what that lying SOB of a thermostat says the house was at
Fuel source: I would think gas is best because you can go to a gas station (or siphon your car), but propane is safer (and easier) to store long term, not sure how much will run it though how long will a little Coleman run it for? do you need the grill sized propane? Usually small engines like that require gas/oil blend so it can get "dirty" so propane might be a cleaner solution, even if the fuel is more expensive it really comes down to how often are you going to use it does that difference in cost really matter?
Brand: Just for sake of investment of protecting a tank, probably would spend a little more to get a name brand, or whatever they have at Costco and just abuse that return policy they have if your generator every dies even if it's years and years later. *shrug* I dunno... I know honda makes some super quiet ones, but are they enough watts to run your tank, *shrug* dunno like I said need to do some research.
One I saw at costco is 3650W continuous, and says 14hr run time at 50% load, so... probably would have had to fill it up at least once.