E.ON Heatwise Times & Boost Control

hax1e

Just wondering if a friendly E.ON Company Representative is still active in this forum?

I have all electric wet radiator system in a large rural barn conversion. Energy is supplied by E.ON on Heatwise/Economy7.
Had a shock to find that E.ON had failed to record anything for Heatwise Boost for about 2.5 years so got presented with a bill showing a sudden debt of about £4,500. E.ON have applied back billing rule and we are currently negotiating on what falls before/after cut off threshold for back billing rule. That’s progressing in right direction, I think.

Needless to say it made me check my bills and usage in more detail and what I find is that my boiler for the central heating is operating too much on boost. Thermostat is about 18 C day & 16 C overnight (hardly excessive). I have been looking at programming thermostat so that it is at 18 C in Heatwise periods and 16 C other times – but what are exact times?
Problem is Heatwise times are just guidelines. My own observation for my location is afternoon 1pm – 4pm, evening 8pm – 10pm, overnight 1pm-6pm. I understand it is radio teleswitch instigated by the Grid and periods of lull/heavy load can affect times but is it possible to confirm my particular norm is as per my observation, and can I get any historical data to indicate how frequentlyHW has deviated from those times historically, say over a year.

My other query is that whilst I have an override boost switch on the immersion heater (also on heatwise but switched off, so uses off peak only), the central heating boiler has no such boost switch. Therefore irrespective of what I do with thermostat program, if the core temperature in the boiler is below threshold of it’s internal thermostat, it will boost anytime to top up, even if thermostat dead low and radiators cold. I tried googling to see if I could see anything about Boost Controllers and whilst I found details of them for immersion heaters, I could not find any mentioning central heating boilers. Are such controllers only for Immersion boilers? I have an Imstor heating system, a giant tank with an internal heating coil that heats up to very high temperature.

I have written to E.ON several times with queries, but most get unanswered and it does not seem conducive to sorting out the billing errors. I thought I’d try to get some more advice elsewhere.

I am looking for any advice and possibly more info. Re:Heatwise periods/historical data –I could supply postcode and/or meter codes (MPAN) by private message if you are willing to investigate.

Regards
Hexie