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Harman Accentra VS Enviro M55 pellet insert heat output?

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by 1Dtml, Nov 29, 2011.

  1. 1Dtml

    1Dtml Feeling the Heat

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    Does anyone have have a direct comparison of the heat output of these two pellet inserts?

    I have to remove my zero-clearance fireplace to install an insert, and I love the zero clearance cabinet option of the Accentra, but I can build the enclosure for the Enviro M55 if there are many advantages to the M55 starting with heat output.

    Any other comparison information will be greatly appreciated, ease of rail systems, noisiness, easy to maintain??

    Thanks to all,

    1D

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  2. Cincinnati Kid

    Cincinnati Kid Feeling the Heat

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    According to the spec sheets, the Enviro puts out 55k BTU's max where the Accentra puts out 42kBTU's. Fairly big difference in my opinion.
  3. 1Dtml

    1Dtml Feeling the Heat

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    That seems to be the case, but I was hoping for someone that may have used both in the same or similar install because I just left a thread involving the black magic of these ratings vs burn rates, and efficiencies (very confusing).

    The other thing that is confusing me is the manufacture differences on how many square foot house or room that each brand covers, for the BTU vs Sq/ft math is definitely far different between manufacturers.

    I appreciate all information that I can get, so thanks so much for your input.

    1D
  4. Marc P

    Marc P New Member

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    The ratings seem to be only rough guidelines. I know layouts differ, but so far I am heating a 2300 sf 1928 farmhouse with my Accentra insert mostly on lowest settings. I do have good insulation and I haven't had any zero degree nights, but the unit still has a lot of output to go. Couldn't be happier so far.
  5. Delta-T

    Delta-T Minister of Fire

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    i have the 2 sitting side by side in my showroom....the 55 is more powerful, no doubt.
  6. BradH70

    BradH70 Feeling the Heat

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    Before I bought my M55 CI, I was able to compare the two units at the dealer. Both were installed and running, siting side by side. The Accentra seemed to have more force behind the air, but the M55 was pushing out hotter air for sure. Plus, the M55 is much quieter (although this may not be the case now with the new heat exchange blower that is being installed).

    The other pro's (in my opinion) were the BUT's, thermostat control and service rail that it is built onto.

    Edit: That should be BTU's not BUT's!
  7. pfmaloney

    pfmaloney Member

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    Both have a rail system, but I believe only the Accentra has an option for the
    OAK to connect to the frame. This allows you to pull the unit out without having to disconnect the OAK.
    Based on my experience with the Accentra and the posts I've seen from M55 owners, I would say that the Harman has a better air wash.
  8. 1Dtml

    1Dtml Feeling the Heat

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    I see a lot of Harman users use the room temperature thermostat control, so do any of you Enviro users have these hooked up to thermostats, and if so do these work well?

    Thanks for all your input.

    1D
  9. BradH70

    BradH70 Feeling the Heat

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    Yes, I have mine hooked up to a Filtrete T-stat and it works great. Right now it is in the Auto/Off mode since the temps have been so mild but normally it is the Hi/Lo mode with the T-stat set at 68 and swing of -1.5*. The t-stat is NOT in the same room as the stove, I have it outside of the room the stove is in and next to the stairs going to the second floor. And that is a nice feature of the M55, you are not restricted to just monitoring the temp of the room the stove is in.
  10. smwilliamson

    smwilliamson Minister of Fire

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    I get this a lot from customers, here's the skinny:

    The M55 is a very large BTU stove, runs quieter on a low heat setting (no pellet dropping sound) but the M55 relies largely on convection for heat transfer. It has a better heat exchanger. IF you remove the fuel restriction plate in the hopper you could get up to 77,000 BTU's but you have to relocate the high limit switch.

    The Harman Accentra, like all Harman Stoves, shares the heat transfer in both radiant and convection. Harman Stoves have the ability to run with the room fan down to almost off...which makes the much quieter on higher heat settings. Harman Stoves are easier to use, slide out, pick up, clean and maintain.

    I want to be a fan of the m55 but there are things about that stove that bother me. Anyone new to pellets that gets this stove has issues to get over the learning curve...it just has too many options. IMHO, many dealers do a poor job of teaching the principles of combustion to stove owners, this is the root of most needless service calls.

    Harman stoves allow pyrolysis to happen in a very natural way (top down), therefore the stove becomes somewhat "hands off" for operation. the M55 is very much "hand on"

    I'd take an Accentra over an M55 any day.
  11. BradH70

    BradH70 Feeling the Heat

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    The Accentra was on the top of my list when I was looking at stoves. It is a great stove and there are lots of members here that rave about them, but the M55 just seemed to be a better fit for me.
  12. smwilliamson

    smwilliamson Minister of Fire

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    Yeah, sory didnt mean to suggest owners should remove the feed plate, then again enviro shouldnt hide a manual reset switch either....somewhat akin to SBI making a control board that locks a out a user out....
  13. jtakeman

    jtakeman Minister of Fire

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    Huh??? Many stove require covers removed to get to the hi limit switch. Name one that is in your face? So your saying that the high limit is easy to get to on the Accentra? How?

    Talk about something that is quirky, How many hours does it take for a Harman to shutdown? How many owners get tired of waiting and just rip the plug out? And how many controllers get winked in the process? How about them flaky pots on the controller?

    IMHO, They are both good units. Each has there pro's and con's. But if you want to get into a pissing match? Stuff will fly from both sides. If the OP wants max BTU's then the M55 wins hands down.
  14. smwilliamson

    smwilliamson Minister of Fire

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    The high limit is wicked easy to get to on a Harman....cause the do not have one. What I'm saying....is that in the M55 manual there is no mention of where the high limit actually is....other than call your dealer for service. Why would they screw and silicone the switch in a hidden area and make it manual reset. Another fine example of a product engineered with no end user in mind. If you are going to to put something like call your dealer for service...or include a labor in a warranty, it would be helpful to sell your product only through dealers that actually have service people....yes?
  15. jtakeman

    jtakeman Minister of Fire

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    "Call your dealer"

    Hah! About every manual I have ever look at or read has them words in there! Including Harman's! I have a Harman dealer in my area that have "0" service personal on staff. They sub there stuff out. Yet the Enviro dealer the next town over has more than one on duty. Go figure!

    Never bothered to look for a high limit, Most of the Harmans I have had my hands on where for messed up ESP's. But a unit that can't shut itself down is gonna be smart enough to not be required to have over fire protection? Yeah that sounds logical!
    hwdemers likes this.
  16. Eatonpcat

    Eatonpcat Minister of Fire

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    Put em up...Put em up!!!

    [​IMG]
  17. jtakeman

    jtakeman Minister of Fire

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    Damn, That looks just like me! :red:
  18. John97

    John97 Feeling the Heat

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    Harman Accentra was at the top of my list too. I made an attempt to check out the Enviro but I made 3 trips to the local dealer and they were closed each time. I checked the BBB as suggested by a member here and found they had a ton of unresolved complaints.

    Ended up going with the Quadrafire Mt. Vernon AE but I do have some regrets I couldn't give the Enviro a closer look because it looks like a fine unit.
  19. flynfrfun

    flynfrfun Minister of Fire

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    I'd say the OP will be happy with either. Yes, one nice thing about the Accentra insert is that it does incorporate the OAK into the sliding rail system. So, when you slide the stove back, it automatically connects both the OAK and the exhaust. Enviro skipped this important detail and left us end users to figure it out on our own. But, I don't think the Accentra's rail system lets you slide it out very far...so truly getting back there for maintenance may be a problem. The Enviro's system allows you to basically pull the stove all the way out so you can get back there behind the stove for maintenance.

    The Accentra has the blower on the bottom of the unit which is about the worst possible spot to get to for cleaning, especially on an insert where the hearth is close to the floor. Don't know what they were thinking when they designed that. My M55 has been a piece of cake to clean...very easy. All blowers, motors and fans are easy to get to and easy to get in/out.

    I sometimes find myself wishing I had bought the Accentra...I think they might be more efficient in heat output for the same amount of pellets burned...but that's just a feeling I get.

    Personally, if I were the OP, I'd let my wife look at both and decide based on looks. Neither stove is perfect. Both put out similar noise. The M55 will put out more heat on high, but then most of us don't ever do that as it will suck the pellets down like they are going out of style. ;-)
  20. flynfrfun

    flynfrfun Minister of Fire

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    You are wrong about the high limit switch. It is under a metal button in the hopper area. No silicone that I'm aware of. Pop the button off, click the switch, pop the button back. If you can't do this, then you shouldn't own a pellet stove as it's as basic as it gets. Also, Enviro has this info in their Quick Reference Guide on the M55.
  21. DexterDay

    DexterDay Guest

    I will be the 1st to say something about the Multi-fuel capability of the Enviro. It can burn just about anything.

    Not knocking Harman. They make a Great stove. And in a side by side cpmparison. If they were both running full tilt. It may be a wash. As BTU is input rating. The ouput is a different story. The Harman has a better heat exchange system (hands down).

    The Harman can burn a 50/50 pellet to corn mix. But in the event pellets ever become scarce or overly expensive. Then burning Paper/Cardboard/Grass pellets or any number of other Bio-mass would be a great option.

    Also Harmans can run quite a few bags without cleaning (when set right) but the agitator in the burn pot of the 55 will eject anything that becomes troublesome.

    My next freestanding upstairs will be a multi-fuel. Just for the agitator and knowing that when push comes to shove, I can burn multiple other fuels.

    Buy what you like and what you think will make you happy. I should have gone with my Gut and got the stove I originally wanted. But because I was "New" to pellets, I picked the Quad because they are the easist stoves to run. Love my stove to death, and heated my home on its own for yrs without any help from the LP furnace. But I want something that has user input. Something I can "tinker" with.

    Good luck and keep is posted.
  22. Trickyrick

    Trickyrick Feeling the Heat

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    I own an Accentra and you can pull the stove out completely off of the rails onto say a cart and take it out to the garage once a year for a teardown cleaning. You leave all the piping behind and do nto have to do anything to disconnect the the exhaust or the OAK.
  23. 1Dtml

    1Dtml Feeling the Heat

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    Oops, sorry for starting a Chevy vs Ford argument, but I'm always the optimist, for look at all the information that came from this, so thanks so much for all your help.

    1D
  24. glenc0322

    glenc0322 Minister of Fire

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    sorry i am new to the pellet family and have a Harman Accentra Insert and love it my question is what is the OAK never heard of it sorry for my ignorance and thanks for the info
  25. John97

    John97 Feeling the Heat

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    OAK = outside air kit.

    It's been discussed, and discussed, and then discussed some more. Just do a search of this forum.

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