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Old 03-12-2010, 04:59 PM   #1
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Location: Winston-Salem NC
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Flat Plate with GMC Diesel

I'm just 2 to 3 weeks from taking my van up to SMB Indiana for build out. I'm strongly considering the Flat Plate water heater. I understand that the engine has to be idling to circulate the hot coolant through the flat plate. I was just wondering how long it would take for the coolant to warm up enough to have hot water after cold start? Diesels run very cool when idling and I am concerned I would have to wait 30 to 45 minutes for the engine to heat up enough. I believe the Ford diesels have a high idle setting but to my knowledge my GMC van doesn't have anything like this.

Does anyone have any insight on this? Thanks.
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Old 03-14-2010, 02:31 PM   #2
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Re: Flat Plate with GMC Diesel

I have the flat plate hot water heater in a Sprinter. I assume the GMC would work the same. I get hot water in about 5+/- minutes. I recommend that you have SMB install a hot water tempering valve at the same time with the flat plate exchanger. Without one the water can get very hot and give you a nasty scald if you are not careful.

hope that helps,
/~fred
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Old 03-14-2010, 03:36 PM   #3
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Re: Flat Plate with GMC Diesel

How quickly does your Sprinter warm up after a cold start? My Duramax can iddle for 15 minutes and the temp gauge still doesn't even register 100 degrees.

That's a good tip on the valve to keep the water from scalding. I've read that can be a serious issue with the flat plate.
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