Extremely high bill

in Energy
13 replies 704 views


  • edited 18 March at 6:47PM
    90Ninety90Ninety Forumite
    28 Posts
    Sixth Anniversary 10 Posts Combo Breaker
    edited 18 March at 6:47PM
     So ,still a bit confused ,my friend ( the tenant)  had the heating inspected by a heating engineer . He had removed some shelving to access the other part ( on the opposite wall)  of the heating system as shown in the image below 

    In repsonse to the post Micron said:

    The only strange thing about all of this is that with the isolator switch in the off position the meter is still showing power usage, it could be that the heating is on a separate circuit but the Tribune tank only has one 3 kW heater, combine that with a pump possibly less than 200 W that would be a total load of 3.2 kW but over six hours with fuse box switched off the load was 4.8 kw per hour, very strange.

    According the heating engineer , he said , the heating system is rated at 7.2 KW  but , there was a leak , and the thermostat is being replaced . This may likely have reduced efficiency but not sure . 

    Also before I posted this ,  I instructed my friend to switch off the 'blank' switch in the MCU  ( circled below )  as it weren't connected to anything in the flat ( switching it off made no difference to electric in flat ) . I am not sure if it is co-incidence but , the bill has since been around half  ( £270 total ) . 

    I have since suggested paying for an electrician to inspect the wiring , and asking them if there are any suspect cables, not sure if the best idea ? I guess its just a labour charge 

  • edited 19 March at 2:21PM
    matelodavematelodave Forumite
    7K Posts
    Ninth Anniversary 1,000 Posts Name Dropper Photogenic
    edited 19 March at 2:21PM
    You see that long narrow box to the left of the red cylinder - that is a FLOW BOILER and it's what is feeding the radiators and possibly your hot water tank and is probably the most expensive way you can imagine to heat a place. Here it is - https://www.heatraesadia.com/products/heating-and-ventilation/electric-flow-boilers/amptec

    They use lots of leccy all the time the place is being heated which is usually at the peak time when leccy is most expensive. Turning stuff off on the power board wont have any real effect on the consumption, unless someone is using a heater in one of the rooms. 

    The only way you will save electricity is to turn the switch off in the heating cupboard - the one with the red light (to the right of the red cylinder) on as it's probably the one that's feeding the flow boiler. However if you do that you wont have heating and possibly not even hot water if the immersion heater on the Tribune tank is not active.

    Is there an isolation switch for the immersion heater located near the hot water tank. There does not appear to be any wiring to the immersion heater unless it's concealed in the insulation. The box to the left of the immersion heater looks like a thermostat and may be controlling one of the motorised valves, the pump and the flow boiler. I guess there is also a room thermostat and timer somewhere which controls the boiler, pump and valve for the heating circuit.

    Never under estimate the power of stupid people in large numbers
  • MicronMicron Forumite
    48 Posts
    Part of the Furniture 10 Posts Combo Breaker

    Maybe the mystery is solved then, it looks like the FLOW BOILER is proving all the central heating and hot water for the whole flat.

    Again i’ve made lots of assumptions and have made a rough calculation for the possible power usage of the flat.

    With the heating on for 2 hours in the morning and 5 hours in the evening, the first hour or so of both periods would be at full load (7.5 kWh) due to cold radiators and hot water recovery, the remainder would be at about the mystery load (4.8kWh).

    2.5 [email protected] 7.5 kWh = 18.75kW

    4.5 hours @ 4.8kWh = 21.6  kW

    Total                             = 40.35kW

    Assuming a cost of £0.16 per unit the cost for one day is £6.45 for heating and hot water, add £1.60 a day for all other electrical items power usage (fridge, freezer, computers, hair driers, lights etc.) and the total cost per day is £8.05 which would equate to £250 per month.

    Obviously if the heating is on for longer than 7 hours a day or it’s extremely cold weather the bill would be more.

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