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If you use electric immersion for your hot water tank, then you will probably have a time switch on it so it uses off peak night rate. This is much cheaper than using your gas boiler. But your hot tank may only have old style insulation, even the spray on foam used by manufacturers is inadequate.


I found that by wrapping an additional 6" thick layer fibreglass wool around the tank and taping it up with plastic sheeting made a big difference. How did I know - the difference in temperature drop through out the day, given no usage.


I was also able to reduce the thermostat to 40C (much less heat loss than say 65C) which made improvements (take a shower directly without diluting with cold water).


For tight areas, use a loose vermiculite, which you can pour down the back of the cylinder.


Worked for me:smile:

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