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Old 10-25-2020, 04:06 PM   #1
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05 Essex block heater?

My 05 Essex has a Hydro Hot 500 series furnace. From the HH manual I've learned that the 500 series does not have the feature that allows heated fluid from the furnace to circulate through the engine to act as a block heater. It has, instead, a separate block heater. I'm assuming it's electric, however when I turn it on, the green light comes on but I see no indication on my Magnum Inverter panel that it's drawing any amps?? How much power should the block heater draw?? I've also learned that even though my furnace doesn't have the feature where the furnace fluid flows through the engine, Newmar has a propriatory system that somehow runs heated engine fluid through the furnace so you have hot water while driving, even though your furnace diesel switch is turned off. Not sure how that works but I know that it does.
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Old 10-25-2020, 04:33 PM   #2
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The standard Cummins block heater should draw 12>13 amps .

Does your Inverter display register all electrical loads , or just those running through the inverted circuits ?
I doubt the block heater would be on an inverted circuit .
On a quiet day , with the block heater on , when you get close to the engine you can hear the hiss of it operating . The heater is in the drivers side of the block around the oil filter.

What manufacturer and model # is your water heater ?
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Old 10-25-2020, 05:04 PM   #3
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Block heater does not operate off the inverter. Shore power or generator must be available. Use volt meter at power outlet to verify. Also look at your ac breakers.

Engine coolant will travel to dash heater. Along the way, the coolant will circulate through the hydrohot and heat the boiler fluid. This way you can heat the basement while driving on cold days.
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Old 10-25-2020, 06:21 PM   #4
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Thanks folks, and one more question. How long should one have the block heater on for it to have any effect on starting your engine??
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Old 10-25-2020, 06:30 PM   #5
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Usually, I start driving in the morning. So I turn it on the night before. As for a minimum, more heat is better, so my guess is 3 hours is helpful if the morning temp is around 30.

But our engine holds 10 gallons. That's a lot of oil to heat up.

Really depends on overnight temps as well as the prior day's high temp.
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Old 10-25-2020, 11:04 PM   #6
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We owned a 04 Essex for 14 years and the cooling system holds over 12 gallons. Our block heater burned out and since it is located in a freeze plug we didn't want to go through that job so we added a add on electric cooling system heater. It just attached to a heater hose and still used the same plug in at the back off engine area. Green light only tells you that you have turned on the power to the outlet, not that the item plugged in his working. Suggest adding the inline cooling system heater.
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Old 10-26-2020, 07:33 AM   #7
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Check the cord to the block heater. It has a knurled nut that you remove to unplug the cord.

It may be bad and replaceable.
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Old 10-26-2020, 07:42 AM   #8
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If you are in really cold weather I'd use the block heater about 8 hours before trying to start if the rig has been sitting a long time, it takes a while for the block to heat up to make a difference.


If not in cold weather the grid heaters should do the job to get the engine running.
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Old 10-27-2020, 11:12 AM   #9
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The information I found on my block heater was that it’s 750 watts, which is roughly 6.25 amps on 120 volt power.
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Old 10-27-2020, 04:32 PM   #10
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The larger engines ( 10.8 liter ISM 500HP ) have larger block headers. On our 04 Essex I think it was 1500 watts which is the same as our 15 liter X-15 605 HP.
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