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2 back boilers

  • 10-08-2008 4:08pm
    #1
    Darth Maul
    Closed Accounts Posts: 336 ✭✭


    Hi,
    Currently in the middle of a new build and are getting a stove with a back boiler as well as a back boiler (grant triple pass) in the fireplace, aswell as an oil burning boiler, the pipes are in and they all seem to be in one circuit,

    What is the most effecient way for these to be connected, should they be isolsated, will they counter each other, can the fire be lit aswell as the oil.

    The contractors plumber doesn't seem to be overly knowledgable about it all.

    Also there seems to be 4 outlets (return and feeds) on the back boiler but he seems to be only using 2 with the other 2 blanked off, is this right?

    thanks


Comments

  • #2
    muffler
    Registered Users, Registered Users 2 Posts: 46,408 ✭✭✭✭muffler


    Dont know if its of any use or not but you could have a look at this thread also.


  • #3
    John mac
    Registered Users, Registered Users 2 Posts: 5,136 ✭✭✭John mac


    only 2 connections are req for the back boiler (one top and one bottom),
    you could put a couple of valves on the back boiler. (not recommended as you may forget to open them)
    only downside is that the heat from the oil burner will be heating the back boiler and then allowing the heat straight up the chimney!


  • #4
    JohnBoy
    Registered Users, Registered Users 2 Posts: 2,342 ✭✭✭JohnBoy


    John mac wrote: »
    you could put a couple of valves on the back boiler. (not recommended as you may forget to open them) !



    Do not under any cirsumstances do this.

    Someone someday will forget to open them.

    and the boiler will explode. whether or not someone is hurt or not is impossible to call, but the chances are hight.

    Either way you will have a serious mess on your hands.

    I dont know the best approach but I do know there should never be valves on a back boiler


  • #5
    Dixy
    Registered Users Posts: 127 ✭✭Dixy


    Never fit valves to a back boiler unless you are talking about non return valves to stop heat traveling back into the back boiler from the other sources. The main problem with back boilers is the heat is totally uncontrolled and fitting stop valves will cause the boiler to kettle and flash water to steam. The other problem with the water temp is that no pump in the world is designed to take more than 65 degree's of heat which means you cant pump your system up to a nice pressure without adding blending valves to cool the water below 65 degrees
    <SNIP>


    Mod edit: No names - read the charter.


  • #6
    ircoha
    Closed Accounts Posts: 2,290 ✭✭✭ircoha


    It is going to be very difficult to get the system to work safely and efficiently.

    The first problem is that OFCH systems work best if sealerd and pressurized.

    You cant do this.

    One thing you must make sure of is that in the event of a power failure that the 2 solid fuel units have adequate venting/heat sinks to absorb the heat.

    When plumbing the grant, they work better if the return and out let are on different sides


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  • #7
    bbam
    Closed Accounts Posts: 7,410 ✭✭✭bbam


    Hi..
    We've had a grant triple pass BB in for 12 years with a non pressurused OFCH system...
    We've been very happy and the BB produces great heat...
    A few comments on previous posts....

    1...I'd agree... BB + manual valves = explosion
    2...We have 2 circulating pumps on our system, one close to the boiler and neither have given any problems...
    3...You dont need mixing valves to cool the water from the BB, this would be a terrible idea, such a waste..
    4...Make sure your plumber gets the support of a heating engineer before proceeding... mistakes will lead to a poor or non functioning system..
    5... Indeed our BB gets warm when the OFCH is on, not very warm, the open chimney is a bigger problem.

    The only reason we're not having a BB this time round is to have a stove so we can air tight the room when it's not lit.

    Cheers
    BAM


  • #8
    demanufactured
    Closed Accounts Posts: 5,756 ✭✭✭demanufactured


    TBH i wouldnt bother with an open fire back boiler , they are a waste of time, what make of stove are you going for , we have a hunter herald 14 in a terraced house and the heat is unreal even in winter , i recommend burning briquettes and eco brite, or turf if you can get some.


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