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Thread: Diesel hot water systems

  1. #51
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    Apr 2009
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    Quote Originally Posted by egn View Post
    I use a thermostat in the separate heating loop, which is connected to the webasto loop by a heat exchanger (see drawing at previous page).

    So the webasto is free running just with it's internal thermostat. But AFAIK it has a control input which can be used to turn it on and off by a thermostat.

    This setup has the advantage that the warm water heater always gets the full heat of the webasto, even when there is no heat for space heating required.
    That's the setup I'm leaning towards, as it allows the (espar in my case) to better regulate the variable burner. If the unit is turned on and off by air temp it can't directly know the heat deficit.

    The water heater always in the loop stores BTU's to allow for a quick warm-up ("quick" being a relative term in Alaska)

  2. #52
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    Las Vegas
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    Does anyone know a vendor that makes a diesel tankless hot water heater. It should be similar to a propane or natural gas TANK-LESS water heater, except diesel generates the heat. I want it to be a "stand-alone" on demand heater that is NOT integrated with the main engine cooling system and not connected to any heat exchanger.

  3. #53
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    Arlington, Virginia
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    Talk to Jim Rixen: http://rixens.com
    --
    DiploStrat

    Web: http://diplostrat.org

    Certified Expo Poseur - Lives on Paved Road

  4. #54
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    Rixsen is one, using espar parts.
    1997 Dodge Ram CTD, 5 Speed manual, BD exhaust brake, 5x12 injectors, 4k Gov. springs, Thuren coils, Fox shocks, Stable loads, 99HD steering, Carli end links, Method Race Wheels, 295/70/18 Cooper STTMaxx tires.

    2011 Northstar Adventurer

  5. #55
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    Aug 2014
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    United States
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    450
    Hmm. Do those have a wait time for hot water? Seems like diesel can't fire up fast enough to provide instant hot water.

    Just glanced at their site. Seems like it's no different that hot water systems that many have built using an espar and heat exchanger to heat water.

  6. #56
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    test.... having problems posting

  7. #57
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    Oct 2012
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    Chapel Hill, NC, USA
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    Quote Originally Posted by javajoe79 View Post
    Hmm. Do those have a wait time for hot water? Seems like diesel can't fire up fast enough to provide instant hot water.

    Just glanced at their site. Seems like it's no different that hot water systems that many have built using an espar and heat exchanger to heat water.
    The video they have on the Class C information page goes into a good bit of detail on the hot water system and claims it's nearly instant and is capable of a 55F delta at 1gpm. For that you'd need the hot water system already fired up, but supposedly it uses less than 0.2gph of diesel. My guess is the startup time is pretty low given the components used from what I've seen. Less than a minute.

    So yeah, you probably don't want to leave it running if you're leaving the camper for many hours, but you probably can leave it running for much of the time you are at your camper.

    I've been looking for exactly this kind of system for my new van build I'm starting soon and the only thing that sucks is that these guys are 3k miles away from me. I've got an email off to them to see if they sell any kind of kit. Hoping so. Even if their system is a mix of OTS parts, it's a very good mix of OTS parts.


    --Donnie

  8. #58
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    Jun 2006
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    Southern OH
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    Quote Originally Posted by DanDaMan View Post
    Does anyone know a vendor that makes a diesel tankless hot water heater. It should be similar to a propane or natural gas TANK-LESS water heater, except diesel generates the heat. I want it to be a "stand-alone" on demand heater that is NOT integrated with the main engine cooling system and not connected to any heat exchanger.
    Quick search.... first thing that popped up is EverHot http://www.suremarineservice.com/eve...er-heater.aspx apparently it attaches to a Webasco or Espar

  9. #59
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    Aug 2014
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    United States
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    So yeah those are definitely misleading in saying that they are on demand. They are only on demand if the system is up to temp from the engine or from the espar or webasto. Basically the same thing everyone builds on their own using an espar and a marine hot water heater or heat exchanger unless I'm missing something.

  10. #60
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    Oct 2012
    Location
    Chapel Hill, NC, USA
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    35
    The system from Rixen is sold as a kit. The installation manual is on their site, but it's...sparse. He says they will have an installation video in a couple months (don't wanna wait that long). But they'll sell the complete kit for about $5200. I'm currently....mulling. That's a lot. The Espar at the heart of the system is only $1600, but it's the other stuff that adds up.


    --Donnie

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