Appropriate title for an aircraft engineer?
LAME, Licensed Aircraft Maintenance Engineer, AMT Aircraft Maintenance Technician in the USA.
Emergency radios on the raft - can you talk with them?
No they beep only. This is called an ELT, there is generally one on the aircraft and others in emergency rafts.
Galley hot water boiler
Maybe a few liters, not sure about quantity in craft.
Cabin printer, cockpit printers
Probably 8 1/2 wide but it is on a roll with perforated seams. They are thermal printers.