I did some research and found out that one of the applications of a heat pump is as a water heater which means that it could achieve a temperature of about 100-degree Celsius. Will changing the refrigerant or the compression ratio of the compressor lead to an increase in the temperature? (R718 refrigerant showing to reach 200-degree Celcius)
If yes what is the maximum temperature that could be achieved? and also will this affect its efficiency?