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Qs how stat on oil boiler and wall stat in house relate and mor

  • 21-12-2010 11:44pm
    #1
    Passport1
    Registered Users, Registered Users 2 Posts: 150 ✭✭


    Hi
    I have oil central heating system running a FireBrid Enviromax boiler that is in a boiler house external to the main dwelling with pipes running back to the main dwelling

    It has been suggested to me so that to ensure pipes dont freeze in this really cold weather to have the heating system timer set to run all the time or at least during the night and to turn the stat on the firebird boiler down to the minimum setting as low as it can go and have either the water or the heating set on constant on the timer in the house

    I have no problem doing this as dont want frozen pipes or worse

    Im just wondering

    1. What is the relationship between the stat on the boiler itself and the stat in the dwelling house

    2. If i have the stat on the boiler turned down as low as it can go say over night and the heating timer set to be on all the time, what setting should i have the stat inside in the house set to - do i need to have it at 20 degrees or would it be ok to have it at 18 or 16 or lower degrees

    3. Is there any recommenation regarding if temperatures hit a certain minus value that you should leave your heating running all night on a low setting or have timer set so that heating comes on for a while a few times during the course of the night

    4. Also what is the most efficient setting to have the stat on the boiler set too. Up until this time, I would never have gone near it seems to be set near to the max setting it can be set too - maybe set at 80-90%. In normal weather conditions what would be most efficient setting to have it set to and also the internal wall stat in the house

    5. Also if out of the house for periods of time over the christmas e.g. away for couple days and have heating timed to come on at different times of the day - how long each time heating comes on is it recommened to time it to stay on - 30 mins, 1 hour, longer... so as dont end up with burst pipes
    Thanks
    Sorry for all the questions


Comments

  • #2
    Mike2006
    Registered Users, Registered Users 2 Posts: 689 ✭✭✭Mike2006


    I would not run the boiler all night. I would consider this a total waste of money.
    To answer your questions:

    1. What is the relationship between the stat on the boiler itself and the stat in the dwelling house
    A: No direct relationship. One indirectly affects the other. The stat on the boiler determines what temp the boiler will heat the water within itself to. The stat on your wall will 'call' the boiler to start and keep 'calling' until the room is at the temp set on the room stat.

    2. If i have the stat on the boiler turned down as low as it can go say over night and the heating timer set to be on all the time, what setting should i have the stat inside in the house set to - do i need to have it at 20 degrees or would it be ok to have it at 18 or 16 or lower degrees
    A: In this scenario it does not matter what setting you have your house stat set to. If your boiler has been correctly sized, if you turn down the boiler stat to minimum, the house stat will never be satisfied even down at 10 degrees probably (in this weather) so it will continue to run all night...

    3. Is there any recommenation regarding if temperatures hit a certain minus value that you should leave your heating running all night on a low setting or have timer set so that heating comes on for a while a few times during the course of the night
    A: I would not think so. All you want to do is keep the water circulated once the temp drops below about 2 DegC. I have a pipe stat on my boiler loop and once that gets to 2 DegC, it will fire the boiler until the loop gets to 10 DegC. This is my equivalent to what you are trying to do.

    4. Also what is the most efficient setting to have the stat on the boiler set too. Up until this time, I would never have gone near it seems to be set near to the max setting it can be set too - maybe set at 80-90%. In normal weather conditions what would be most efficient setting to have it set to and also the internal wall stat in the house
    A: This depends on your system (Rads, UFH, Water Heating etc...) But as a general rule you want your water to get over 60DegC so your boiler output should be as low as possible to give you that desired temp. But again, it is system dependent. When the system was commissioned it should have determined that for you and a mark put on the stat to show the recommended setting.

    5. Also if out of the house for periods of time over the christmas e.g. away for couple days and have heating timed to come on at different times of the day - how long each time heating comes on is it recommened to time it to stay on - 30 mins, 1 hour, longer... so as dont end up with burst pipes
    A: This is another 'how long is a piece of string question really'. If you have UFH, it will run all day and you will get natural cycling of the boiler to satisfy it. Same with rads if you have them on temp control. If you are on time control heating then it would depend on how well insulated your house is and how much lagging you have on your pipes etc...

    In summary, to protect the boiler loop, fit a pipe stat to circulate the loop. In the house, pipes well lagged with a warm house should keep you good.

    Sorry if the answers cause more confusion but one answer does not always fit all...

    Some of the answers are also a matter of opinion. Other people may have different viewpoints.

    Mike.


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