Question: do block heaters have a thermostat?
Answer: Engine Block Heater. ... The ones that go into the block do not have thermostats. For a V8 engine they are only 400-600 watts, and the engine ones do not really get hot; just warm to the touch. Since you only need 1.5 hours of heat to get it up to the desired starting temperature, a timer will have you a lot of money.