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What does hot water cost?

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    What does hot water cost?

    At the risk of sounding like Wilmslow's sockpuppet, I was Googling for an idea of cost to heat a litre of hot water, or to run a bath. I can't find an answer, though quite a few similar questions. I could use maths and specific heat values, but doesn't anywhere list how many kWh or units of gas are needed?

    Anyone?
    Originally posted by MaryPoppins
    I'd still not breastfeed a nazi
    Originally posted by vetran
    Urine is quite nourishing

    #2
    How hot is hot?

    This may help http://blog.plotwatt.com/2009/08/bes...oil-water.html
    Last edited by PRC1964; 26 October 2009, 23:15. Reason: I forgot the link :(

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      #3
      It takes about 1/10 kWh of energy to boil a litre of water and around 5kWh to heat a bath. If using electric it's near enough 100% energy conversion from energy paid for to heat, but leccie is more expensive than gas per kWh (see bills). The gas needed depends on your boiler, it's perhaps 60% efficient. Lecci is about 10p / kWh, so about 50p for a bath and 10p for a litre of tea.

      Comment


        #4
        Originally posted by TimberWolf View Post
        It takes about 1/10 kWh of energy to boil a litre of water and around 5kWh to heat a bath. If using electric it's near enough 100% energy conversion from energy paid for to heat, but leccie is more expensive than gas per kWh (see bills). The gas needed depends on your boiler, it's perhaps 60% efficient. Lecci is about 10p / kWh, so about 50p for a bath and 10p for a litre of tea.
        0.10 kWh to boil a litre of water priced at £0.10 per kWh is £0.10?

        Comment


          #5
          Originally posted by AtW View Post
          0.10 kWh to boil a litre of water priced at £0.10 per kWh is £0.10?
          How long have you spent working that out?
          +50 Xeno Geek Points
          Come back Toolpusher, scotspine, Voodooflux. Pogle
          As for the rest of you - DILLIGAF

          Purveyor of fine quality smut since 2005

          CUK Olympic University Challenge Champions 2010/2012

          Comment


            #6
            Originally posted by Zippy View Post
            How long have you spent working that out?
            Just enough time to make a cuppa

            Comment


              #7
              Originally posted by AtW View Post
              0.10 kWh to boil a litre of water priced at £0.10 per kWh is £0.10?
              Oops, around 2p for a litre of boiled water (my last leccie bill shows 18p / kWh at peak rate) and around £1 for a bath.

              Comment


                #8
                Originally posted by TimberWolf View Post
                Oops, around 2p for a litre of boiled water (my last leccie bill shows 18p / kWh at peak rate) and around £1 for a bath.
                Peak rate?

                Ain't they all peak rate at around 10p per kWh?

                I am trying not to look at my power bill

                Comment


                  #9
                  Originally posted by AtW View Post
                  Peak rate?

                  Ain't they all peak rate at around 10p per kWh?

                  I am trying not to look at my power bill
                  There's a night rate (5p / kWh) and and another rate after a set number of units have been used (13p / kWh) shown on my bill, both of which are cheaper than the regular peak (day) rate of 18p / kWh.

                  Comment


                    #10
                    Originally posted by TimberWolf View Post
                    There's a night rate (5p / kWh) and and another rate after a set number of units have been used (13p / kWh) shown on my bill, both of which are cheaper than the regular peak (day) rate of 18p / kWh.
                    I pay flat cost around 10p per kWh - you seem to have a very bizarre setup.

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