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Oil Boiler Isolation Switch.

Zoomup
Evenin' All,


Regarding an external ground sited domestic oil fired boiler for heating and hot water that has an internal switched fused connection unit nearby inside the house, what regulations will require an external electrical isolator adjacent to the oil boiler? You know the sort of thing, a double pole rotary isolator. 


Z.


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  • 0

    Alan Capon:




    Zoomup:

    Is it not better just for the boiler to "top up" the heat in the 32 litres store of hot water rather than heat up from cold every time a hot tap is opened?  Surely that is why a hot water storage tank is included in the boiler. And what happens if there is a need, say in the middle of the night, for hot water if the hot water timer if off?




    The heat store is used to provide hot water quickly from a combiboiler when needed, rather than having to wait for the boiler to possibly heat from cold. The heat store will also be able to provide some hot water on its own when the boiler “hot water” is turned off. An example of this, would be overnight where water was only required for hand washing. If the occupants go to work, then it would be usual to set the hot water to off during the day, until the time they return. Either way, I believe the building regs require a time clock, regardless of whether the occupants choose to set it to “permanently on”. 


    As Andy has already said, you are probably should have a pipe stat to work with the frost stat, especially if the boiler is outside. 


    Regards,


    Alan. 


     




    This is getting like the electrical analogy of installing a new consumer unit for just one new socket outlet. How far do we go to "modernise" a system if just a new boiler is installed. Just how much is the customer willing to pay in labour and materials? This is not a new installation, it is an upgrade.


    Z.

Reply
  • 0

    Alan Capon:




    Zoomup:

    Is it not better just for the boiler to "top up" the heat in the 32 litres store of hot water rather than heat up from cold every time a hot tap is opened?  Surely that is why a hot water storage tank is included in the boiler. And what happens if there is a need, say in the middle of the night, for hot water if the hot water timer if off?




    The heat store is used to provide hot water quickly from a combiboiler when needed, rather than having to wait for the boiler to possibly heat from cold. The heat store will also be able to provide some hot water on its own when the boiler “hot water” is turned off. An example of this, would be overnight where water was only required for hand washing. If the occupants go to work, then it would be usual to set the hot water to off during the day, until the time they return. Either way, I believe the building regs require a time clock, regardless of whether the occupants choose to set it to “permanently on”. 


    As Andy has already said, you are probably should have a pipe stat to work with the frost stat, especially if the boiler is outside. 


    Regards,


    Alan. 


     




    This is getting like the electrical analogy of installing a new consumer unit for just one new socket outlet. How far do we go to "modernise" a system if just a new boiler is installed. Just how much is the customer willing to pay in labour and materials? This is not a new installation, it is an upgrade.


    Z.

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