They can be run on red but it has to be clean and well filtered, have two systems one with jerry can that has been run on red but what you save is not worth the hassle, the other is fed from the van tank. Plumbed into the van tank is the way to go no chance of it running out of fuel. Used all year round ,makes the job more efficient, as in the subject, 'Is it worth it?' a big yes from me.