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We have always used the immersion for hot water since we moved in 4 years ago( landlord told us this is how we warm up the water)
Our central heating control has a timer, but we cannot just switch to just water/just heating its both. Which is a pain having to keep turning the valves on and off each day,so thus, been using immersion!
Just switched off every appliance in the house,and switched the immersion on, nearly had a fit at the speed it sped round! Had a worry it was the old fridge and freezer we had, but its obviously not!
Originally posted by sassybabee33
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Most Immersions are 3kW. So if you have it on for 20 minutes it will use 1kWh. If you have it on longer it will switch itself off /on as it is thermostatically controlled.
You have a strange CH system that won't allow you to have hot water only.
Even so if you are using the CH for radiators you should still have it for both HW and heating as it is much cheaper to heat water. That applies even if that means the HW is on for hours, once the tank is full of HW it will not use any more gas.
In summer shut off the Heating by using the valves and still use gas - or get a timer and have your immersion heater on at night using the cheap economy 7.
If your tank is lagged it will stay hot.