R.P.McMurphy explained :
How would i go about calculating how much it would cost to heat an average
showers' worth of water using a typical calor gas sized bottle. I will be
using a 15kw gas water heater and a 3 bar pump.

A long time ago, when I last compared bottled gas to electricity they
cost about the same. I can't be certain, but I think I compared the
10Kg sized Calor bottle - the larger the bottle, the cheaper the
contents.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk