How much oil does heating boiler consume per hour?

Discussion in 'UK DIY' started by MM, Jan 17, 2005.

  1. MM

    MM Guest

    My new house is equipped, in the garage, with a wall-mounted oil-fired
    central heating and hot water boiler. It is an "HRM Wallstar", approx
    2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How
    much in litres per hour is this boiler likely to consume? This to give
    a comfortable temperature, but not hot, despite the current rather
    cold climate (I hate hot houses).

    I had 1,000 litres filled on 21st December (the tank was almost empty)
    and was pleasantly suprised the other day to see that the level has
    not gone down much at all since then. Obviously, the house is well
    insulated. The hot water is, if anything, too hot.

    MM
     
    MM, Jan 17, 2005
    #1
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  2. MM

    John Guest

    "MM" <> wrote in message
    news:...
    > My new house is equipped, in the garage, with a wall-mounted oil-fired
    > central heating and hot water boiler. It is an "HRM Wallstar", approx
    > 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How
    > much in litres per hour is this boiler likely to consume? This to give
    > a comfortable temperature, but not hot, despite the current rather
    > cold climate (I hate hot houses).


    The data you give is meaningless. 9 radiators gives no indication at all of
    how big, how many panels, what you consider to be a comfortable temperature
    probably does not agree with someone else, what your hot water usage is, the
    room sizes, whether you have a detached or a terraced house of bungalow etc
    etc etc. So in short its impossible to give any form of sensible answer I'm
    afraid.

    >
    > I had 1,000 litres filled on 21st December (the tank was almost empty)
    > and was pleasantly suprised the other day to see that the level has
    > not gone down much at all since then. Obviously, the house is well
    > insulated. The hot water is, if anything, too hot.


    You should have a cylinder thermostat which you can turn down but don't turn
    it down too far or legionella might start to grow in your system:-(
     
    John, Jan 17, 2005
    #2
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  3. "MM" <> wrote in message
    news:...
    > My new house is equipped, in the garage, with a wall-mounted oil-fired
    > central heating and hot water boiler. It is an "HRM Wallstar", approx
    > 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How
    > much in litres per hour is this boiler likely to consume? This to give
    > a comfortable temperature, but not hot, despite the current rather
    > cold climate (I hate hot houses).
    >
    > I had 1,000 litres filled on 21st December (the tank was almost empty)
    > and was pleasantly suprised the other day to see that the level has
    > not gone down much at all since then. Obviously, the house is well
    > insulated. The hot water is, if anything, too hot.
    >
    > MM


    Post some details of your boiler, and what thermostats you can find round
    the place.
     
    James Salisbury, Jan 17, 2005
    #3
  4. On Mon, 17 Jan 2005 19:31:57 +0000, MM wrote:

    > How much in litres per hour is this boiler likely to consume?


    The documentation should have that information or it might be on the
    rating plate. Our big cast iron lump has a spec that around 7l/hour
    but it is big, 38kW output. Oil has about 10kW/l of energy so that
    means about 50% effiency which for ordinary cast iron conventionaly
    flued boiler is about right.

    > I had 1,000 litres filled on 21st December (the tank was almost
    > empty) and was pleasantly suprised the other day to see that the
    > level has not gone down much at all since then.


    Tiddly tank then. Filled ours up with 2000l on the 23rd Oct more than
    half of that has gone, estimated reorder date for another 2000l is 2nd
    Feb, that should last until October. Drafty old stone built house with
    little insulation at 1400' on the North Pennines, so a little
    different to the sub-tropical south. B-)

    --
    Cheers
    Dave. pam is missing e-mail
     
    Dave Liquorice, Jan 17, 2005
    #4
  5. MM

    Alec Guest

    Alec, Jan 17, 2005
    #5
  6. MM wrote:

    > My new house is equipped, in the garage, with a wall-mounted oil-fired
    > central heating and hot water boiler. It is an "HRM Wallstar", approx
    > 2' 6" high, 10" deep and 15" wide. There are 9 radiators in total. How
    > much in litres per hour is this boiler likely to consume? This to give
    > a comfortable temperature, but not hot, despite the current rather
    > cold climate (I hate hot houses).
    >
    > I had 1,000 litres filled on 21st December (the tank was almost empty)
    > and was pleasantly suprised the other day to see that the level has
    > not gone down much at all since then. Obviously, the house is well
    > insulated. The hot water is, if anything, too hot.
    >
    > MM


    On a 3500 sq ft house, I have got through 2200 liters since August -
    just about to refill. I reckon a modern well insulated 4-bed family
    house of half the size probably would take half that or less. Usage
    seems to be almost zero in 3 summer months, and twice as much in winter
    a spring and autumn. Which means that 2200 liters is for me autumn and
    half a winter.

    Or anbout 3 months of winter usage. So I am cracking around 700 liters a
    month in winter. It snot been a month since dec 21st., so I would
    probably have used 500 liters in that time.

    I would guess that you have used less than 250 liters.
     
    The Natural Philosopher, Jan 18, 2005
    #6
  7. MM

    Rob Morley Guest

    In article <>,
    "Dave Liquorice" says...
    > On Mon, 17 Jan 2005 19:31:57 +0000, MM wrote:
    >
    > > How much in litres per hour is this boiler likely to consume?

    >
    > The documentation should have that information or it might be on the
    > rating plate. Our big cast iron lump has a spec that around 7l/hour
    > but it is big, 38kW output. Oil has about 10kW/l of energy


    Watts aren't energy, they're power. Joules are energy.
     
    Rob Morley, Jan 18, 2005
    #7
  8. MM

    MM Guest

    MM, Jan 18, 2005
    #8
  9. On Tue, 18 Jan 2005 04:12:19 -0000, Rob Morley <>
    wrote:

    >In article <>,
    >"Dave Liquorice" says...
    >> On Mon, 17 Jan 2005 19:31:57 +0000, MM wrote:
    >>
    >> > How much in litres per hour is this boiler likely to consume?

    >>
    >> The documentation should have that information or it might be on the
    >> rating plate. Our big cast iron lump has a spec that around 7l/hour
    >> but it is big, 38kW output. Oil has about 10kW/l of energy

    >
    >Watts aren't energy, they're power. Joules are energy.


    He meant kWhr (or electricity units if you prefer). 28sec oil, or
    kerosene, is 10.35kWhr/l. So 85% efficient boiler and 24.68p/l the
    equivalent unit price is 2.80p.

    BTW in case anyone is interested the figures for LPG are about 600
    units in 47kg (the large bottle). So at 26.50 per bottle that 4.4p
    per unit. Add in the boiler efficiency and full rate electricity is
    cheaper than LPG!


    --

    Malcolm

    Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK
    (, or ).
    Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power
    electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see:

    http://www.fullcircuit.com or http://www.fullcircuit.co.uk

    NEW - www.CharteredConsultant.co.uk - The Consultant A-List
     
    Malcolm Reeves, Jan 18, 2005
    #9
  10. MM

    Guest

    On Wed, 19 Jan 2005 09:29:02 +0000, Malcolm Reeves
    <> wrote:

    >>How many litres are there in a 47kG cyclinder?

    >
    >I reckon it is 24150 l, so 0.11p/l for 47kg at 26.50. How does that
    >compare with bulk LPG?


    I read that the propane density is 500kg per m^3, lpg is a mixture but
    principally propane, that gives me 94 litres to the 47kg cylinder and
    at GBP26.5 for 47kg about 27.5p/ltre, 4.3p/kWhr.

    AJH
     
    , Jan 19, 2005
    #10
  11. On Wed, 19 Jan 2005 19:42:43 -0000, "Mike" <> wrote:

    >
    ><> wrote in message
    >news:...
    >> On Wed, 19 Jan 2005 09:29:02 +0000, Malcolm Reeves
    >> <> wrote:
    >>
    >> >>How many litres are there in a 47kG cyclinder?
    >> >
    >> >I reckon it is 24150 l, so 0.11p/l for 47kg at 26.50. How does that
    >> >compare with bulk LPG?

    >>
    >> I read that the propane density is 500kg per m^3, lpg is a mixture but
    >> principally propane, that gives me 94 litres to the 47kg cylinder and
    >> at GBP26.5 for 47kg about 27.5p/ltre, 4.3p/kWhr.

    >
    >That's far more like it. Bulk was 23p/litre when we had it and when it when
    >up for the fourth time in a year I told them to come collect their tank and
    >put in oil.


    Oops. I seem to have propane as 0.5kg/m3 so I think I have missed a
    1000 there somewhere. And I worked the numbers out wrong too! Doh!

    Sounds like bottles are not that much more than bulk 23p/l vs 27.5p/l.

    And we agree on the kWhr price.


    --

    Malcolm

    Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK
    (, or ).
    Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power
    electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see:

    http://www.fullcircuit.com or http://www.fullcircuit.co.uk

    NEW - www.CharteredConsultant.co.uk - The Consultant A-List
     
    Malcolm Reeves, Jan 20, 2005
    #11
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