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Electric boilers - effect on power demand of a block of flats

Hello there.


I would like to  know if anyone on the forum has done a study of or knows about an existing study of the impact on power demand of introducing electric boilers to block of flats. 


I have been tasked with estimating the impact of a gradual migration to electric boilers for central and water heating in a modern block of flats. Nearly all of the flats currently use gas fired combi boilers.


I then have to present this information to UK Power Networks so that they can asses whether or not an increase in capacity to the building supply might be needed in future.  Finally I need to put any recommendations to the owners' management board.


Clearly electric boilers will have some impact on power demand.


I can start with an estimate of current power demand (worst case) for a typical flat.  To that end, I'll be doing a survey of about 25% of the flats to come up with a figure.


I can then apply the IET Electrical Installation Design Guide diversity calculations for a typical flat and then the building as a whole using figure 3.4 (IET Electrical Design Guide Nov 2008 page 33).


I can then do a second power consumption exercise adding the demand of a typical electric boiler per flat and then the whole building.


However, it's not clear to me if this approach will be suitable for a massive migration to electric boilers.  I need to be sure of my ground if I approach UK Power Networks with a demand figure.


If we look at the usual peak use of heating demand (morning and evening) a building full of electric boilers, to me, could add a significant load to existing street fuses and possibly even cable capacity.


I would be grateful for any suggestions and experience people could bring.


Kind regards


donf










Parents


  • It may be that a Des. Res has a bath in the bathroom,  But round here (Hants) there are plenty of young couples in 2 bed flats and converted parts of Victorian 3 story houses that only have a shower, and the same is true of some folk living in caravan parks in static homes, though these usually have propane heating and a 32A supply, some of the larger models may well have a bath. Such bath free properties do sell, and fast, but those customers with more money will obviously go for better.


    In such a property the solution when baby comes along is one of these Combination changing table and bath unit on a trolley. the padded changing area lifts off and underneath is the bath.

    Anything like toddler age can indeed go in the grown up shower, and play the 'look it's like rain only warm' game. No worse than using the showers at the swimming baths. For occasional visitors etc, it is quite possible to wash a small child in a kitchen sink.


    Actually a large no. of the older properties probably predate all of this indoor bathroom idea- I was staring again into the void of the flat in Farnborough this weekend,  and identifying the pipe stubs from the gas lights, which were probably not an original fit either but a modernising convenience over an oil lamp or something. Buildings of that age would not have had hot water at all, and maybe even cold water was pumped outside, certainly all the the WC piping is very much an addition. I suspect that that folk who lived there first would have found a shower an unimaginable  luxury, and in the grand scheme of things it is not that long ago, also It is certainly not the oldest building in the street by far that is very much in use. ( ~ 150 years is after all only a couple of lifetimes - as a child I remember a scary Aunt who was very much a Victorian who was very dismissive of dependence on modern fancies like the electric kettle- her parents would have been from the generation that built that..)

    My point is in some ways the same, and that is to say that progress being "forwards" in terms of increasing amounts of stuff, and increasing energy available is not really guaranteed, and luckily perhaps, not essential. I still maintain that we had it best with near free oil and gas, about 20- 30 years ago, and now it needs to be paid for.


    A 13A socket does the labour of perhaps a team of ten or more very fit slaves - there are not many jobs where we can work at hundreds of watts for very long.


Reply


  • It may be that a Des. Res has a bath in the bathroom,  But round here (Hants) there are plenty of young couples in 2 bed flats and converted parts of Victorian 3 story houses that only have a shower, and the same is true of some folk living in caravan parks in static homes, though these usually have propane heating and a 32A supply, some of the larger models may well have a bath. Such bath free properties do sell, and fast, but those customers with more money will obviously go for better.


    In such a property the solution when baby comes along is one of these Combination changing table and bath unit on a trolley. the padded changing area lifts off and underneath is the bath.

    Anything like toddler age can indeed go in the grown up shower, and play the 'look it's like rain only warm' game. No worse than using the showers at the swimming baths. For occasional visitors etc, it is quite possible to wash a small child in a kitchen sink.


    Actually a large no. of the older properties probably predate all of this indoor bathroom idea- I was staring again into the void of the flat in Farnborough this weekend,  and identifying the pipe stubs from the gas lights, which were probably not an original fit either but a modernising convenience over an oil lamp or something. Buildings of that age would not have had hot water at all, and maybe even cold water was pumped outside, certainly all the the WC piping is very much an addition. I suspect that that folk who lived there first would have found a shower an unimaginable  luxury, and in the grand scheme of things it is not that long ago, also It is certainly not the oldest building in the street by far that is very much in use. ( ~ 150 years is after all only a couple of lifetimes - as a child I remember a scary Aunt who was very much a Victorian who was very dismissive of dependence on modern fancies like the electric kettle- her parents would have been from the generation that built that..)

    My point is in some ways the same, and that is to say that progress being "forwards" in terms of increasing amounts of stuff, and increasing energy available is not really guaranteed, and luckily perhaps, not essential. I still maintain that we had it best with near free oil and gas, about 20- 30 years ago, and now it needs to be paid for.


    A 13A socket does the labour of perhaps a team of ten or more very fit slaves - there are not many jobs where we can work at hundreds of watts for very long.


Children
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