Espar and Webasto both make 3 kinds of heaters that run on diesel... . 1 that heats water only, 1 that heats air only and 1 that does both... . on large class 8 trucks your likely to see the 3rd style that heats both water and air..... keeping the engine and cab warm... . on marine applications you usually just see air heaters and on smaller equipment that doesn't have the battery sizing ability you see just water heaters and a timer circuit to start and stop the trucks heater fan as necessary to preheat the drivers compartment... .
Webasto will only install one for you and if you can find a good Espar dealer they can sell you the D5 I think is the most common heater and timer... . it heats the water and with the timer circuit will cycle on and off the trucks heater fan... it also has a battery monitor so that you can't run the battery down and it won't start... .
Most of these heaters consume less that a quart of fuel overnight or for an extended amount of time... . Hope this helps and is what your looking for...
Thanks everyone!
Positive feed back at 2 forums from users of these (Espar) units.
I have sent an e-mail to Espar via their web-site contact, and will report their response here.
E-mail:
[[Hello,
Some questions regarding your coolant heater for Dodge (I will post your response on the Turbo-Diesel Register web-site, and RV. Net, ... I am a forum member at both sites, where discussion of these units is taking place):
On page 36 (item B) of the 2007 Dodge Ram (truck) catalog, there is mention of a "fuel operated cabin heater". The photograph shows the word "Hydronic" on the side of the unit.
1. Is this an Espar unit?
2. If so, which of your technical manuals and web-site descriptions applies to the unit that would be supplied for '07 Ram trucks?
3. Is this a factory installation original-purchase option, or strictly a dealer-supplied/installed item?
4. When will these units be available through Dodge dealers (My dealers seem not to know much about the heaters)?
5. What is the cost of the appropriate unit or kit if purchased directly from Espar or it's dealers?
Thank you for your time and attention,and any information,]]