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    • shopaholicz
    • By shopaholicz 11th Oct 16, 10:18 AM
    • 628Posts
    • 415Thanks
    shopaholicz
    what's cheapest to run central heating or Dyson am09?
    • #1
    • 11th Oct 16, 10:18 AM
    what's cheapest to run central heating or Dyson am09? 11th Oct 16 at 10:18 AM
    Hi,
    Now the weather is turning colder I'm hoping someone on here can help me work out which is going to be cheapest to run, our central heating or a Dyson am09.

    We have a large 5 bedroom house with 10 central heating radiators. Last year we had heating on 2 hours in mornings and 3 hours in evenings.

    This year we now have 2 adults at home 24/7, so the heating would need to be on for considerably longer, thinking 8am-8pm on low?

    I've recently bought a Dyson am09. The front room has double doors, which can be shut and we could use the am09 to heat this one room and leave the central heating same timings as last year. Or we could put heating on 8am-8pm.

    Can anybody explain how I can work out which would be cheaper to run please?
    I love a bargain. Now mortgage and debt free. hurray!!
Page 2
    • lstar337
    • By lstar337 14th Oct 16, 2:39 PM
    • 2,866 Posts
    • 1,468 Thanks
    lstar337
    Istar337 makes a very important point here. If you just heat one room in a house you can increase the chance of mould and damp in other areas of the house.
    Originally posted by CashStrapped
    I can't take all the credit for that as Pete9501 mentioned it earlier after I failed to point it out in my initial post.
    • Cardew
    • By Cardew 14th Oct 16, 2:57 PM
    • 26,058 Posts
    • 12,527 Thanks
    Cardew
    It is pertinent to point out that if you are only heating a room(s) to prevent damp, it is far more effective and economical to use a dehumidifier. That said a dehumidifier works better in warm air so whilst the humidifier itself produces heat, it might be necessary to warm the room on occasion to get rid of more moisture.

    If dampness is a problem, it is important to find the source of the problem - even if it is just a ventilation issue. Warming a room simply means the warm air will hold more moisture, it is not a solution. That additional moisture will appear on any cold surface e.g. windows.

    http://www.nhs.uk/chq/Pages/How-do-I-get-rid-of-damp-and-mould.aspx

    http://www.maintainyourbuilding.org.uk/pages/getting_to_grips_with_damp.html
    Last edited by Cardew; 14-10-2016 at 3:00 PM.
    • coffeehound
    • By coffeehound 14th Oct 16, 3:30 PM
    • 428 Posts
    • 677 Thanks
    coffeehound
    This thread doesn't contain quite enough variables yet, so may I add another?

    Although the rating plate on the heater may say 2 kW, it won't use that amount of electrickery all the time. Things that have a thermostat or other power regulator only use that power during the 'on' cycle. A 2 kW heater left on for an hour will not use 2 kWh unless perhaps it is set to maximum temperature.

    Also: £400?? That's 20x what any of my heaters cost! It better be good.
    • lstar337
    • By lstar337 14th Oct 16, 3:49 PM
    • 2,866 Posts
    • 1,468 Thanks
    lstar337
    It is pertinent to point out that if you are only heating a room(s) to prevent damp, it is far more effective and economical to use a dehumidifier. That said a dehumidifier works better in warm air so whilst the humidifier itself produces heat, it might be necessary to warm the room on occasion to get rid of more moisture.
    Originally posted by Cardew
    Just want to jump in and say that desiccant type dehumidifiers are not bothered by cold temperatures like a compressor type is. Compressor types are most efficient between 15c & 30c and performance is poor below 5c. Desiccant models are happy to work from 0c through to 30c without any drop in performance.
    • matelodave
    • By matelodave 14th Oct 16, 10:39 PM
    • 2,580 Posts
    • 1,398 Thanks
    matelodave
    Just want to jump in and say that desiccant type dehumidifiers are not bothered by cold temperatures like a compressor type is. Compressor types are most efficient between 15c & 30c and performance is poor below 5c. Desiccant models are happy to work from 0c through to 30c without any drop in performance.
    Originally posted by lstar337
    I've owned both sorts and the compressor unit used to freeze up when it was cold.

    The dessicant ones are much more effective down to very low temperatures although they probably cost a bit more to run - they are also a lot quieter as they don't have a compressor rattling inside them
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    • rtho782
    • By rtho782 17th Oct 16, 8:24 AM
    • 621 Posts
    • 397 Thanks
    rtho782
    The Dyson heater will use 2kW of energy to produce 2kW of heat. There may be times that it uses less energy (dependant on thermostat or whatever) but then it will put out less heat.

    It will be 95%+ efficient (5% is for the fan). It will never produce more heat than it uses in electricity.

    Your gas boiler, if modern, is 90% or more efficient. You can, if you like, turn all the radiators off except the one in the desired room. It can also never produce more heat than it uses in electricity.

    Except that gas is around 1/4 of the price of electricity, so it's way way cheaper to run than your gimmicky fan.

    If you want cheap to run, environmentally efficient, etc, get air source heat pump/air con in every room. As this is moving heat, not creating heat, you can gain 4.0kW of heat in a room from less than 1kW of electricity. You can also cool in the summer. So it's effectively 400%+ efficient.

    It's probably about the same to run as gas, as gas is so much cheaper, but can be powered from renewable sources.
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    • jazzy
    • By jazzy 17th Oct 16, 10:19 PM
    • 800 Posts
    • 185 Thanks
    jazzy
    Thanks, that will use exactly 2kw every hour it's on.
    Originally posted by Alter ego
    Not really, because the Dyson is controlled thermostatically.
    • lstar337
    • By lstar337 18th Oct 16, 10:08 AM
    • 2,866 Posts
    • 1,468 Thanks
    lstar337
    If you want cheap to run, environmentally efficient, etc, get air source heat pump/air con in every room. As this is moving heat, not creating heat, you can gain 4.0kW of heat in a room from less than 1kW of electricity. You can also cool in the summer. So it's effectively 400%+ efficient.
    Originally posted by rtho782
    Not always. The outside temperature will greatly affect the COP.

    Being realistic, I would expect to see a COP of about 3.5 in good conditions, reducing to 1 in very cold weather.

    You would find it difficult to beat gas with ASHP's.
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