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  1. #1
    Join Date
    May 2008
    Location
    New England
    Posts
    118

    Default regulating heat w/Buderus gas boiler

    We're @ our wits end with our Buderus natural gas boiler and logomatic computer - hoping someone here can explain why this 4 year old boiler can't seem to keep a 20' x 24' family room (on a separate zone) at 68 degrees. We have a Cape with 3 separate heating zones - the main house, the basement rec room, and the family room. The heating in main house and rec room zones "stay" wherever the thermostat is set. Can hear them click off and on when temperature drops or reaches the desired temps (main house is set @ 65, and rec room is set @ 60).

    The family room thermostat is set @ 68 because this room can easily drop to 66, 65, even 63 in the course of a day. At 6 a.m. today, the family room was a very comfy 68, however by the time we left for work the room was down to 65. We've just returned home from work and the room is down to 63. Why isn't it @ 68??????

    There is heat coming from the 4 baseboards in family room - baseboards are located on 4 walls of the family room - not nearly as hot as they were this a.m. when room was 68. Its beyond us how this space drops 5 degrees when the thermostat is set @ 68. And at other times is 68.

    We've had the HVAC folks out here a number of times - they've suggested not touching the thermostats (which we don't). They've also said its normal for a room's temp to drop 2 degrees (which would mean 66 is the norm when thermostat is set @ 68?). The family room is on a concrete slab. but the addition is well insulated.

    I maintain that if the other thermostats/zone can "heat" the other spaces to whatever the temp is set to, so should the family room.

    Any ideas or suggestions. I'm thinking we're wasting a lot of gas when the system "runs" non stop trying to reach 68, but can't get past 63, or 65 or 66. We've taken to heating this space with an electric space heater in the evenings cuz the space is "cold". It seems to "hit" 68 at times no one is in the space.

  2. #2
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,208

    Default Re: regulating heat w/Buderus gas boiler

    Sound like there isn't enough baseboard in the room to overcome the heat loss.

    John

  3. #3
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    993

    Default Re: regulating heat w/Buderus gas boiler

    the first two things that come to mind are the concrete slab acting as a cooler for the room. and the second thing is the location of the thermostat. is it close to an exterior wall, is it on an unusually warm interior wall?

  4. #4
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,208

    Default Re: regulating heat w/Buderus gas boiler

    Quote Originally Posted by MLB Construction View Post
    the first two things that come to mind are the concrete slab acting as a cooler for the room. and the second thing is the location of the thermostat. is it close to an exterior wall, is it on an unusually warm interior wall?
    When the heat loss was done to determine the amount of baseboard needed to heat the room the loss from the slab should have been part of the calculation. There is not enough baseboard in the room.

    John

  5. #5
    Join Date
    May 2008
    Location
    New England
    Posts
    118

    Default Re: regulating heat w/Buderus gas boiler

    There's baseboard on every wall possible - cuz there's also a fireplace (there's baseboard next to fireplace), sliders (there are baseboards on either side), the main door & a window (baseboard below window), and the open entry to main house. Thermostat is on "interior" wall near entry to main house. Room is wall to wall carpeting.

    When the room reaches 68, the baseboards are super duper hot (why too hot to touch). And this generally happens on the coldest of days (temps in teens), & during the wee hours of a.m. But when outdoor temps are in 30-40, the room temp drops to 63-66 and the baseboards remain luke warm.

  6. #6
    Join Date
    Jan 2012
    Posts
    5

    Default Re: regulating heat w/Buderus gas boiler

    I'm not a heating spe******t but had similar issues after our oil to gas conversion. If we went away for extended trips and set the house to 50-55 it sometimes took all day to raise the temp to 65 on our return. The radiators were sometimes just luke warm like yours.
    Learned that there is a "smart" controller that adjusts the water temp in the radiators depending on the outdoor temp. On a mild day the system only pumps warm water thru the radiators and then very hot on very cold days. If we came home on a 50 degree day the system didn't care that we wanted fast heat, it just moved warm water. If we happen to bump up the thermostat on a very cold day the house warmed up fast as you would expect.
    We had a service tech out (on a mild day by chance) and he temporarily disconnected the outside temp sensor. The system pushed piping hot water through the radiators which raised the house temp immediately.
    You may have an issue with your sensor. If it is located in a sunny warm corner outside it may cause your system to lower the radiator temp enough that it won't compensate for normal heat loss. See if a service tech can make an adjustment.
    I was ready to put in a cut off switch to the outside sensor to disable it when we needed full blast heat. We have since sold the house so I never tried it though. Good luck.
    Last edited by DIYPeter; 01-19-2013 at 12:57 AM.

  7. #7
    Join Date
    May 2008
    Location
    New England
    Posts
    118

    Default Re: regulating heat w/Buderus gas boiler

    Been a while since initial post/inquiry, so figured I'd update those interested .... "finally" after umpteen visits from umpteen HVAC techs we have a heated 20 x 24 family room that really is "heated". Were lucky enough to track down a Buderus "expert" that really knows this complicated system (w/o asking for my users manual). Most importantly, he listened to us & didn't act like we were talking crazy.

    After a lot of looking, talking and photo taking, said the new boiler piping wasn't done properly and the hot water that was suppose to be flowing directly to the family room, was actually coming by way of the bedrooms, at times flowing in reverse. Has anyone ever hear of such a thing? He said its actually a fairly common mistake.

    After a couple of hours of repair work - re-piping and a some kind of "flow valve" that prevents water flowing in reverse, we have a warm family room - tstat is set @ 68, room is 68, and stays @ 68. The upstairs bedrooms are now regulated by the main house tstat (as they should have been) - set @ 64 and they're at 64. He also adjusted the heating curve (said prior HVACs had it set incorrectly).

    Amazing ......... now we'll see if this $$$ system saves any $$$ or not ... its only been 5+ years in the making.



    Quote Originally Posted by crylakel View Post
    We're @ our wits end with our Buderus natural gas boiler and logomatic computer - hoping someone here can explain why this 4 year old boiler can't seem to keep a 20' x 24' family room (on a separate zone) at 68 degrees. We have a Cape with 3 separate heating zones - the main house, the basement rec room, and the family room. The heating in main house and rec room zones "stay" wherever the thermostat is set. Can hear them click off and on when temperature drops or reaches the desired temps (main house is set @ 65, and rec room is set @ 60).

    The family room thermostat is set @ 68 because this room can easily drop to 66, 65, even 63 in the course of a day. At 6 a.m. today, the family room was a very comfy 68, however by the time we left for work the room was down to 65. We've just returned home from work and the room is down to 63. Why isn't it @ 68??????

    There is heat coming from the 4 baseboards in family room - baseboards are located on 4 walls of the family room - not nearly as hot as they were this a.m. when room was 68. Its beyond us how this space drops 5 degrees when the thermostat is set @ 68. And at other times is 68.

    We've had the HVAC folks out here a number of times - they've suggested not touching the thermostats (which we don't). They've also said its normal for a room's temp to drop 2 degrees (which would mean 66 is the norm when thermostat is set @ 68?). The family room is on a concrete slab. but the addition is well insulated.

    I maintain that if the other thermostats/zone can "heat" the other spaces to whatever the temp is set to, so should the family room.

    Any ideas or suggestions. I'm thinking we're wasting a lot of gas when the system "runs" non stop trying to reach 68, but can't get past 63, or 65 or 66. We've taken to heating this space with an electric space heater in the evenings cuz the space is "cold". It seems to "hit" 68 at times no one is in the space.

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