Watertown’s fire department is asking the city to hire four more firefighters, saying that’s the most affordable way to run the department. Chief Matt Timerman and Deputy Chief Michael Kellogg laid out their budget for the department as the city council continued budget discussions Tuesday night. The department has 68 line personnel right now. Timerman says adding four new firefighters would save the city $50.000 to $75,000 a year. He notes there would be little to no savings in the first year after the hires. That’s because of additional costs for training and equipping them. The department is also looking to buy a utility task trailer for certain rescues. It has frequently borrowed UTVs from other agencies over the past three years.