The engine number is stamped on the engine block as shown in the drawing.
Kia Niro 2017 (DE HEV) Service Manual: Exhaust Heat Recovery System(EHRS) Description and operation
Description and Operation
During cold start or in winter, the fuel efficiency can be improved by heating
up the coolant with the exhaust gas heat discharged after combusting the engine.
When the engine has been sufficiently warmed up, the valve on the passage of exhaust
gas is ope ...
Kia Niro 2017 (DE HEV) Service Manual: Coolant Repair procedures
Refilling And Bleeding
Never remove the cap when the engine is hot. Serious scalding could be
caused by hot fluid under high pressure escaping from the reservoir.
  ...