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Which runs cooler?

Discussion in 'DIRECTV Tips and Resources' started by Paul A, Oct 25, 2007.

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  1. Paul A

    Paul A Godfather

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    Jul 12, 2007
    HR20-700
    HR20-100
    or
    HR21

    I have a cabinet that's not well ventilated. I plan on improving the venting but in the meantime I'm about to buy another HR20-700 but I would consider the HR21 if it runs cooler.

    Paul
     
  2. mooniac

    mooniac AllStar

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    Sep 27, 2006
    I have 2 HR20-700s, both in very similar cabinets and one runs 109 and the other 123 so I'm not sure if you can really decide from the data you'll get here.
     
  3. Paul A

    Paul A Godfather

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    Jul 12, 2007
    hmmm, that's interesting.

    The HR20-700 has vents on the top and I believe the HR20-100 and HR21 are enclosed on top. I wonder how much the ventilation on top of the HR20-700 helps with cooling?
     
  4. cdizzy

    cdizzy Icon

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    Jul 29, 2007
    The HR20-100 runs far cooler than the -700. I have only seen mine hit 100 once. It's usually around 98.

    I don't know what the HR21 runs at.
     
  5. gulfwarvet

    gulfwarvet Tips & Resources Collaboration DBSTalk Club

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    it's not how many or how big the vents are, for they only offer more radiant cooling. it has to do with the CFM's that the Fan can pull outside air across the Hard drive.

    with the Hr20-700 it has the open vent enclosure on top that adds to the radiant cooling. But by doing it this way it is harder for the fan to force cooler outside air into the unit. therefore, the Fan has less velocity of air to pull and push for it a open enclosure. causing it to run at a higher Temp.

    average temp on my HR20-700 is 127 degrees without a chill pad.

    with the HR20-100 it has the closed enclosure with smaller vents placed in certain locations increases the ability of the fan to pull outside air and direct it across the Hard Drive and push it out again at a faster rate of CFM's. therefore, the air flow is faster and channeled through out the unit lowering the temp.

    average temp on my HR20-100 is 97 degrees without a chill pad
     
  6. Jeremy W

    Jeremy W Hall Of Fame

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    Jun 19, 2006
    My HR21-700 is currently at 115, with no extra cooling contraptions.
     
  7. paulman182

    paulman182 Hall Of Fame

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    Aug 4, 2006
    As far as I know, no one has confirmed that the temperature is measured at the same point in the units.
     
  8. toneman

    toneman Legend

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    Oct 23, 2007
    Also keep in mind that ambient (i.e., surrounding) temps will affect the HR** temp readings--IOW you can't tell me that your HR** temp remains relatively stable no matter how warm or cool your living/family/HT room is.

    In my case--the HR20-100 sits by itself on the upper shelf of a two-shelf enclosed HT cabinet in which the front door of the cabinet is closed, while the back of the cabinet is open (i.e., no panel on the back side). With the room temp in the mid-70s, my HR20 typically reports temps in the mid-100s (usually around 104); FWIW the area on/near the left side of my HR20 feels noticeably warmer, compared to the right side of the HR20 which feels almost as cool as a cucumber.
     
  9. Stuart Sweet

    Stuart Sweet The Shadow Knows!

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    Jun 18, 2006
    The temperature readings on the HR20-100 are lower, but I don't know if that really means the ambient temperature is lower. I know it means the temperature around the sensor is lower.
     
  10. Robert Norman

    Robert Norman Mentor

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    Aug 26, 2005
    My HR20-100 temperature stays between 102 and 105. My HR20-700 stays between 125 and 130 degrees. They set side by side in an open cabinet that is very ventilated.
    Mike
     
  11. cmoss5

    cmoss5 1960'S NOSTALGIA

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    May 26, 2006
    Tucker,GA
    THE HR20-100 RUNS 10 TIMES COOLER THAN THE HR20-700...BELIEVE ME AS I HAVE 1 OF EACH OF THESE IN MY HOME...
     
  12. Jeremy W

    Jeremy W Hall Of Fame

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    Jun 19, 2006
    I BELIEVE YOU ARE EXAGGERATING JUST A BIT...
     
  13. armophob

    armophob Difficulty Concen........ DBSTalk Club

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    The HR20-700 runs very warm to the touch like an old 1980's VCR, which is irritating. As I understand it the other 2 do not. For that reason alone I would pick one of the other 2 and would make the OTA the deciding factor.
     
  14. Paul A

    Paul A Godfather

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    Jul 12, 2007
    Agreed - I opted to buy a hr21-700 since I dont use ota. I moved my egg cooker to another room so that it's not enclosed in a cabinet. That's one big heatsink!

    Paul
     
  15. armophob

    armophob Difficulty Concen........ DBSTalk Club

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    Nice, very nice. I want one now.:D
     
  16. armophob

    armophob Difficulty Concen........ DBSTalk Club

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    I went as far as to call the CSR's and request a leased trade in to replace my HR20-700's for HR21's. The rep I spoke with said they have no way of selecting which dvr I will receive.
     
  17. hilmar2k

    hilmar2k Hall Of Fame

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    Mar 18, 2007
    Exactly how is that math done? Ten times what? Just curious.
     
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