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Oil Boiler Isolation Switch.

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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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    The other problem with the traditional UK indirect water cylinder is that it can only accept a relatively small heat input - maybe 3 or 4kW for a traditional one, perhaps twice that for a newer 'high recovery' types - all due to the limited surface area of the coil. A gas boiler will kick out tens of kW - so if it's only supplying the hot water cylinder it'll soon bring the heating water up to maximum temperature and have to shut down (or modulate down/short-cycle) - and that's just the kind of thing that wrecks boiler efficiency. Heating the hot water at the same time as the radiators means the boiler is running flat out and so far more efficiently - but of course that only helps when there's space heating demand.

       - Andy.
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  • 0
    The other problem with the traditional UK indirect water cylinder is that it can only accept a relatively small heat input - maybe 3 or 4kW for a traditional one, perhaps twice that for a newer 'high recovery' types - all due to the limited surface area of the coil. A gas boiler will kick out tens of kW - so if it's only supplying the hot water cylinder it'll soon bring the heating water up to maximum temperature and have to shut down (or modulate down/short-cycle) - and that's just the kind of thing that wrecks boiler efficiency. Heating the hot water at the same time as the radiators means the boiler is running flat out and so far more efficiently - but of course that only helps when there's space heating demand.

       - Andy.
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