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M818 Benmar Arctic Heater Installation

JasonS

Well-known member
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Location
Eastern SD
The standard coolant heater, even when installed in the cab, really isn't quite enough so I looked at the arctic heater options.
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Based on the discussion on this forum, the Benmar seems to have a better track record. As it turns out, there is a 20k btu Benmar heater available from the usual auction house. It is really quite small and opens up options regarding placement.
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JasonS

Well-known member
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126
63
Location
Eastern SD
A better pic showing the general location. Yes, the outlet will be very hot. I plan on rolling a shroud to prevent inadvertent contact. The fuel filter is the one used on the multifuel flame heater.

I tested this heater quite a few times before committing to the install. Once the air is out of the fuel line, they will reliably start within 2 minutes. The 5-pin connectors are available on Amazon for ~$25 each if you need to make your own cables. I will finish out the electrical once I decide where to mount the control box...
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JasonS

Well-known member
1,642
126
63
Location
Eastern SD
The success with the Benmar cabin heater led to the installation of a coolant heater.... Benmar also made a 15k btu coolant heater; it didn't put out as much heat as my Stewart Warner 939J24 but the small size and built in pump made it very appealing. I first planned on installing it in the driver's side toolbox but there is a spot on the fender which looked ideal.
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Since this part of the fender is a little difficult to get at, I started by making a drill template out of aluminum. I clamped the template to the fender, drilled the heater mounting holes, and scribed the exhaust and drain holes. Using a compass, I put the point into the scribed circle and drew three arcs to find the center.
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The heater flexed the fender a little more than I wanted so I fabricated a strut to tie into the air filter housing. I am a complete novice when it comes to TIG but I believe it works better for small parts than a MIG.
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I still need to finish the plumbing and electrical but I mocked up a potential exhaust to show hot it could work.
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BKubu

Well-known member
Steel Soldiers Supporter
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Location
Gaithersburg, MD
Looks very cool. I've had fuel burning heaters in trucks. They work great. What are you doing for defrost (or did I miss that)?
 

canadacountry

Well-known member
126
308
63
Location
Canada
never seen many fuel heaters but have always liked them in general tho, seriously plan on one for my upcoming truck (whether the heater unit is an ex-military used one or a new/used commercial truck one is up for eventual debate but mm) as well

nothing like just a little bit of power draw and "unlimited fuel" to literally un-freeze the cabin with a little bit of friendly 'haste' on an early morning -19c winter with some wind blowing .. and the sun isn't quite up yet (you wonder why i don't always like some car rides well before 8am but umm mm yeah say no more)
 
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