Diesel Heaters

Discussion in 'General Open Forum' started by BCROB, Dec 11, 2019.

  1. Chuck

    Chuck Active Member

    I realize this an older thread but maybe someone can shed some light on the Wallas that is in my boat, using diesel fuel.
    Starts and runs consistently but very poor BTU's and the fan power is just about nonexistent. I ended up pulling out the corrugated tubing that ran to 4 vents then added a couple pieces of tube coming right off the Wallas and straight into the cabin, still not good but much better than it was.
    For such an expensive piece of equipment it is not worth the money, won`t do that again!

    Any thoughts or hints on how to improve this Wallas would be greatly appreciated..

    Thanks,
     
  2. Rain City

    Rain City Crew Member

    My Espar has one vent. Puts out a ton of heat but would assume the air pressure would be pretty lame with even just one more.
     
  3. fishin solo

    fishin solo Well-Known Member

    I have a wallas.... 3 vents and it gets smoking hot.... haven’t had mine past #3 on the heat settings.
     
  4. Gong Show

    Gong Show Well-Known Member

    With these diesel forced air heaters, check the air intake screen often.
    Reduced air inflow causes many problems.
     
    Chuck and Rain City like this.
  5. Fisher_dude

    Fisher_dude Well-Known Member

    Mines a Wallas 30gb.
     
  6. fishin solo

    fishin solo Well-Known Member

    What model do you have? I know some are only rated for a certain amount of vents , and also says which outlet to run more then 1 vent or the longer run. I have the 22GB and it’s worked great. I also have the 2 other fan speeds ‘turbo’ which I have never used or needed.
     
  7. Fisher_dude

    Fisher_dude Well-Known Member

    Also to touch on this, check to make sure your vents are fully open. Mine were closed and it cause me problems
     
  8. Chuck

    Chuck Active Member

    I'll check the model. Have 2 speeds but a very week blower fan.

    Pulled all vents out and piped 2 short runs right from the blower outlets right into the cabin, still very poor. Insulated the short runs to get as much heat into the cabin as possible. Such an inadequate heater for the cost!! I have a wind meter and will put it against the outlets and see exactly what there is for blower power.
     
  9. Rain City

    Rain City Crew Member

    Did you check the intake as someone had suggested? What about the air tightness of your boat? If it's a drafty pig you'll be fighting a losing battle
     
  10. fishin solo

    fishin solo Well-Known Member

    Maybe the fan is messed up right from brand new ? Have you talked to trotac about it ?
     
  11. Chuck

    Chuck Active Member

    Intake vent is clear, I will pull out the full length of vent line to be sure. No not drafty at all full aluminium cabin and good windows, I can use a small Buddy heater on low and gets very pleasant
     
  12. Rain City

    Rain City Crew Member

    That's very odd then. My cabin is massive and it turns into a sweat box.
     
  13. Chuck

    Chuck Active Member

    All sounds good no suspicious noise or strain coming from the unit.
     
  14. Rain City

    Rain City Crew Member

    Thermostat issue?
     
  15. Chuck

    Chuck Active Member

    Not really a thermostat, a dial from 0-10 more of a timer for how long the unit runs, which I think is somewhat odd!

    It is a thermostat, just doesn't work. Unit is either on or off.
     
    Last edited: Mar 26, 2020
  16. fishin solo

    fishin solo Well-Known Member

    Yep somethings not right..... that to me sounds like a fuel pump problem...... runs for 5 min then burns itself out? If that’s the case you have a weak fuel pump. Easy way to check that is to gravity feed it and if it’ll runs fine then the pump is the problem.
     
  17. Chuck

    Chuck Active Member

    So this is what I found using a Kestrel wind and temp indicator.

    Two short outlet runs 14" long, 3" diameter piping with a 90 deg bend into cabin. Both outlets have external piping insulation.
    Wallas 30DT, installed behind front bulkhead at starboard helm. Seems like a good spot for installation, plenty of space for the unit and vents.

    Blower outlets:

    * Upper:
    At outlet 9 mph, temp 169 deg.
    1" away from outlet 7.4 mph, 175 deg.

    * Lower:
    At outlet 9.8 mph, temp 146 deg.
    1" away from outlet 8.3 mph, 149 deg.

    Temperature actually seems pretty good but the blower is another story, very weak!
     
    Last edited: Mar 26, 2020
  18. Chuck

    Chuck Active Member

    Well just spoke with Wallas Rep at Trotac.
    Start it and let it run and don't worry about it, their not like a Wabaso or others that are much better.
    Difficult to understand why anyone would recommend such a POS for what they cost!

    Thanks for your replies.

    Wardo
     
  19. Rain City

    Rain City Crew Member

    Can you add a booster fan to the ducts?
     
  20. triplenickel

    triplenickel Well-Known Member

    Have you gone through the whole air circuit including the heater? Squirrel or mouse stash some kibble this winter?
     

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