Fischer Future heaters - tech advice please


Has anyone come across Fischer Future Heat? I've just been out to visit someone who is on E7. She replaced her two NSH with these new heaters last September. 

The Fischer heaters are a bit like short term NSH, they only operate on the day rate tariff and are fully programmable. They have a clay core that stores heat. So the programmer controls the heater which draws electricity to heat the core and then releases it into the room. Their advice is to set the room temp to 20-21, but they also have a minimum temp and advise you set it to 18 so the system never lets the room fall below 18, even outside of your programmed 'ON' periods. Because, they say, this way the heater only has to increase the room temp a few degrees back up to the comfortable day time rate, rather than let the room cool down over night and need a lot of energy to heat in the morning.

I am not sure about this, surely it takes the same amount of energy to heat a room to a certain temperature whether you do it quickly or slowly?? Energy in must equal heat out, minus a few losses. This lady prefers it cooler overnight anyway so we have just reduced her minimum temp to 16, we'll see what effect that has.

The next alarm bell is rung by the fact that the company has just contacted her offering their own new electricity tariff, 15.19p/kWh (no night rate)

Also my client has used almost three times as much electricity on her day rate this winter with the new heaters compared to last winter when she had the old NSH. I would've though this would be balanced by a reduction on the night rate consumption, but it has not. Presumably because the new heaters are still coming on overnight to maintain the advised minimum 18.

Its a top floor 2 bed flat, insulated walls and roof and double glazed.

I'm hoping the heaters are just being used incorrectly, but worst case scenario is that the heater are simply high energy users, installed on a E7 system on the higher day rate. The sneaky company then sets up its own supply company to sell expensive electricity to the owners.

Does anyone have any advice or experience with these heaters? I was wondering about switching my client to a standard non-E7 tariff, but she has an off-peak water heater on E7.



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  • Hi Sophie,

    I saw someone in a very similar position a couple of weeks ago. Their 'minimum' was set to 16 and their bills were very high. They're on the cheapest available tariff for their usage, in a 2 bed flat which is in the middle of a well insulated block (flats either side and above and below), and the monthly average cost is still well over £100.  I'm afraid I don't have an answer, but perhaps this is a campaigning issue?


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