A family discussion at the weekend about energy savings.
Hot water tank linked to a system boiler.
Assume water runs through the boiler and is heated up and then put in the boiler and stored. Water is then drained from the tank when you turn on the hot tap.
But you can run the hot tap until you have used all the water and it runs cold so therefore the tank must backfill with cold water when the boiler isn’t on? Is that right? In which case does it always add cold water every time you run the hot tap and the boiler isn’t running?
So when you run the boiler again does it take the water from the boiler, heat it up again and put back in boiler? Or does it just add more fresh hot water into tank?
My sister says she only runs the boiler for 30 mins a day and that gives her all the hot water she needs for the day and I am trying to equate that with mine where I have a pressurised vented (or is it unvented) cylinder. I usually have my hot water on for 2 hours in morning and same in evening.
Of all the DIY stuff I have picked up over the years, I have just never got my head round boiler and heating!
Confused of Lanarkshire.
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