Wood Burner with back boiler - heating installation questions

Discussion in 'UK DIY' started by Peter Sheppard, Sep 20, 2005.

  1. Firstly the wood burner is being installed by a qualified HETAS
    engineer, so that is all under control.

    It will be used to drive the central heating system and hot water.

    My questions relate to the plumbing side.

    I already have a hot water cylinder plumbed in to give hot water through
    electric heating. It is an indirect cylinder and I have the indirect
    coil plumbed "ready" for the woodburner.

    However, looking at various web sites there seems to be a requirement
    for a radiator in the indirect circuit to act as an additional load
    (minimum 1kW). Does this radiator have to be at the same height (more
    or less) as the cylinder or can it be lower? The reason I ask is that
    (as you would expect) the hot water cylinder is upstairs but I would
    like this "load" radiator to be downstairs.

    Second question.

    What is the physical make up of the back boiler? There are 4 tappings -
    two for the hot water circuit and two for the heating circuit - are they
    "commoned" inside" (it is not clear from any drawings or explanation).

    Again, the reason I ask is that I have all the feed and expansion tanks
    set up for the indirect hot water, when that is connected to the
    heating, will the heating share the same feed and expansion or do I need
    another tank in the loft!

    Finally, is there a "best" place for the central heating pump? It is
    shown in schematics as being in the return leg of the heating system,
    but does it have to be next to the boiler or can it be a distance away?

    Thanks in advance.

    Peter
     
    Peter Sheppard, Sep 20, 2005
    #1
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  2. Peter Sheppard

    Guest

    Re: Wood Burner with back boiler - heating installation questions

    Peter Sheppard wrote:
    > Firstly the wood burner is being installed by a qualified HETAS
    > engineer, so that is all under control.
    >
    > It will be used to drive the central heating system and hot water.
    >
    ><snip>


    I appreciated you have already committed yourself to this configuration
    but I will warn you, based on experience, that it does not work
    whatever the stove seller says.

    The problem is that the amount of heat you require to drive the CH
    system requires the stove to be driven hard, and because the water
    jacket does not totally encapsulate the flame as in a gas or oil
    burner, there is a large amount of heat leakage with the result that
    the room the stove is in gets uncomfortably hot. I considered using
    hot air extraction and circulation to get round this but in the end
    opted for an oil burner with the wood stove operating in parallel
    through a mixer tank.

    I will admit that I have never bothered with a bleed radiator and in 25
    years have never had a problem.

    Rob
     
    , Sep 20, 2005
    #2
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