It is probably the heater control valve that is the problem.
yes in a way. block heaters heat the coolant in the block there for warming the block up. coolant heaters heat the coolant out side the engine like in the hoses and radiater. and when the coolant gets hot enough it opens the thermosate and starts flowing through the engine..The coolant heater should be hooked into the engine so that it heats only the engine and the heater core. If the coolant heater is trying to heat the radiator then it will not work very well to heat the engine, you would need a lot of BTUs to heat the radiator as it will shed all that heat to the air that is surrounding it.
It might be broken
no Yes, it can cause the belt to squeak and slip.
Engine block heaters were optional.
There are many reasons why an engine will sputter when revved. There may not be enough fuel getting to the engine, there may not be enough electricity getting through the car, or the computer could be going out.
It doesn't.
No factory installed unit. OEM stopped block heaters after consumers reported engine compartment fires using block heaters.
Hot Start is one company that manufactures engine heaters. KAT's by Five Star Manufacturing, J. Jeb Manufacturing, WATTCO, Watlow, DBK USA, and Thermal Solutions of Texas are also some makers.
The thermostat would be the first thing I would check.
I am not sure what you are asking about, but I am pretty sure all heaters work from the heat of the engine. The water flows through and cools the engine off, then is cooled off with the fans in the front (by the grill). The air then flows through this water (the fan doesn't cool it off completely, just a little but below the temperature of the engine. The air then goes through the radiator and into the car. I am pretty sure that is how it works.
Metal fragments in the fuel can damage any engine! They clog fuel lines, injectors (if the engine has them) and fuel filters, causing problems getting enough fuel to the engine. The fragments that make it through to the cylinders can cause scratches in the cylinder walls, the intake and exhaust valves. These prevent good seals and reduce the power of the engine and can eventually cause permanent damage.
Glow plugs and engine block heaters