Factory Honda block heater

[Miller88]

Is the "drain plug" we're talking about a freeze plug? Most vehicles use a freeze plug block heater, don't they?

[California98Civic]

Originally Posted by Miller88

Is the "drain plug" we're talking about a freeze plug? Most vehicles use a freeze plug block heater, don't they?

Nope, we're talking about the coolant drain plug.

[seeodywhy]

It's in the front to the left of the exhaust pipe. Not sure if freeze plug only pertains to domestics but this definitely screws in.

[Cobb]

Myself and a few of the newer insight owners decided to get one for more MPG and to avoid driving 5-7 miles or worse, idling for 15 minutes for heat. Like the AC, the heat is also hybrid, half warm and runs down the mpg and prevents EV mode.

Its 400 watts. If you left it plugged in for 8 hours you got heat and the cold engine light wont light up, but thats a hell of a lot of waste. We find its most efficient to plug it in for 2 hours before driving and that warms up the enbgine 2 miles or about 2 minutes quicker.

I got a katz 800 watt one I am going to try this winter. Yes, there is a plug about the size of a half dollar with a hex on it to remove for the block heater. This isnt a freeze plug not the block drain bolt. You got to remove the splash guard, belly pan and reach around behind the passenger side firewall under the car to get to it.

[oil pan 4]

Originally Posted by MetroMPG

The more power in your block heater, the better. More heat in less time means you'll use it more often (more convenient, even for unscheduled trips), and save more fuel.

This is very true.
With block heaters, bigger is better and less is not more.
I use two 600w OEM style heaters on the 6.5L diesel.
Those 2 heaters can take a 550lb+ cast iron engine from 0'F to near freezing in 45min.
It makes heat a lot sooner, but not right away and makes starting a lot easier.

What type of threads are used on that honda block heater?