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is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

Discuss is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler at UK Plumbers Forums; Hi I have a Grant Euroflame 90/120 Kitchen/utility boiler and I think Iíve worked out how it works. The boiler is outside in a shed. Thereís a standard 3 wire ...
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    Default is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

    Hi
    I have a Grant Euroflame 90/120 Kitchen/utility boiler and I think Iíve worked out how it works.

    The boiler is outside in a shed.

    Thereís a standard 3 wire mains power cord going into it (no other wires).

    4 pipes coming out, 2 heats the centre heating, 2 heats the hot water.

    Thereís 1 pump in the shed for the centre heating 1 pump in the house for the hot water.

    So as thereís only the power cable going into the oil boiler i think the boiler must only monitor the temperature of the water thatís actually in the boiler. So it must maintain the temp of say 1 litre of water so if the pump is turned on it heats all the water in the system.

    (At first I thought a thermostat inside the house would control the oil boiler but as no wires except the power cable goes into the boiler that canít be the caseÖ)

    So Iím now concluding that the room thermostat controls the centralheating pump and not the oil boiler and again the thermostat on the combo electric hot water cylinder must control the pump and not the oil boiler.

    Also if all of thatís correct then doesnít that mean if the oil boiler is constantly heating say that 1 litre of water for when the pump is turned on isnít that a waste.

    I would of hoped the thermostat would control the oil boiler directly and so it would only heat the required water..

    So how much of that is correctÖ.

    Thanks

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    Default Re: is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

    It should all be interlinked to give control over the boiler.
    If the boiler fires up on its own with no demand it's not wired correctly.

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    Default Re: is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

    That's how some older systems work. It's as you say...the boiler keeps itself hot then water is drawn off as needed.
    They were designed that way for simplicity when fuel was very cheap.
    You can improve the situation by modifying the controls so that you are only feeding power to the boiler when there is demand. However, this is not a DIY modification.
    Something you can do yourself is check that the insulation on the boiler and especially the pipework is in good order.

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    Default Re: is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

    As above. Old systems relied on boiler stat for control. Swap to S plan, get 2 or 3 estimates.
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    Default Re: is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

    thanks..... when I get back from my hols ill look into that....


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    Default Re: is this how my oil boiler works.....Grant Euroflame 90/120 Kitchen/utility boiler

    thanks ..... when I get back from my hols I'll look into that....



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