The Furrion RV Tankless Water Heater - Gas - Automatic Pilot - 60,000 BTU - 16" x 16" Door # FR98SR will come with everything you need to install it. You will need some plumber supplies like Teflon tape and such but you can source those at a local hardware store very easy.
However I do recommend getting or replacing your water heater temp and pressure relief valve.
Depending on your fitting sizes you will need the Camco RV Water Heater Temperature and Pressure Relief Valve - 3/4" Valve... view full answer...