I have a Honda WH15X that I use to irrigate frome the pond. Runs a hose and several sprinklers. I think the WB15 will work great ,much better than 12V. I wouldn't have the pump run for too long with your nozzle closed. I leave a hose running back into the pond so some water is always flowing, keeps the pump from getting hot if I shut down my hoses. You could get a garden hose 'Y' that lets you run two hoses from one spigot and run one short hose back into your barrel. Looking at the pump specs you should be fine running a sprinkler. You don't have to run the engine wide open either, mine runs one hose nicely just above idle.