How to change the nozzle, pump screen and oil filter on your oil fired heater. Make sure if you’re replacing the nozzle you get the right one for your heater. They must make about a hundred different ones. Very important that you do use the right one.
How a nozzle works
They produce a uniform spray of fuel into the heater box. They come in different flow rates and spray degrees so make sure you get the right one for your heater. Even a wrong will work, but it could end up costing you a lot more in fuel.
I’ve never heard or had a issue with back draft being an issue from changing the nozzle. But do make sure you install the correct one.
I m changing the nozzle is there a chance of back draft