Yes, you're right that's called thermostad.
thermostad
thermometer
Thermostat
A device for regulating furnace heat is the thermostat. A programmable thermostat can be set to control the temperature inside the home on a regular schedule. The thermostat is set to a desired temperature and then the furnace turns on and off to accomplish the desired heat level.
thermostat is commonly used to regulate the heat of a furnace. It can programmed to maintain a desired temperature by turning the furnace on or off as needed. Some thermostats have additional features such WiFi connectivity, smart home integration, and scheduling options.
A furnace is a device used for heating.It convert sample to ash.
Routers
Pacemaker
The most important one is the blast furnace.
A valve (device) to regulate flow to prevent over loading a system
A furnace is a device to make air hot and spread it through a home via heating pipes.
Not unless you are a licensed and certified plumber and have the authority to possess and install your own regulating device.