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Re: Re: Re: Re: block heater
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Posted by buickanddeere on January 06, 2004 at 11:19:09 from (192.75.48.3):
In Reply to: Re: Re: Re: block heater posted by Allan on January 06, 2004 at 08:56:43:
The tank heaters have overtemp thermostats to cut power until the temp drops as fresh cool water flows in by convection from below. Some also have a one way check valve to prevent backflow when the engine is running.
The ordinary everyday block frostplug heater has no thermostat. The cycling you hear is a pocket of steam being formed,rising as bubbles and collasping as they hit cooler liquid/metal above. Then you hear the steam being replaced with cool water over the hot element.
The frost plug heater usually has a shorter life as it doesn't cut out at high temps and the element is small for it's power rating.
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