How you "shut up" hot water tank.

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13 Feb 2010
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Glasgow
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I know very little about central heating.

When I had the radiators on for testing today, there was noise from the hot water tank in the first floor. When I switched the heating off, if didn't appear to stop. So I checked the "lifestyle" control and ensure both water heating and radiator heating was off. I could "hear" that the boiler was off. The hot water tank was still making a noise like an electric immerser heater. There was a switch in the cupboard with the hot water tank with a wire connecting to top of tank, I learned from previous post that this is a "back up" should water cool down too much, so I switched that off. No difference, so I went to fuse box and switched off the fuse that said "immerse". That made no difference. I then noticed there was another device attached to the hot water tank, it looks like a thermostat of some sort, says "drayon" on it is white, with the scale 50 to 90 degress (I think if I remember correctly), so I turned this to the lowest it could go and the noise kept going on. There was a small gap around this thermostat so i could see a tiny bit inside the tank, the bit I saw was glowing bright orange.

I looked in the fuse box again, there is a switch which reads "heating"- i was tempted to throw that off, but thought i should ask here first.

Central heating engineer out earlier and said there was nothing at all wrong with water heating.

I am used to electricity water heating where you simply switch on and off as desired. What happened today irritated me, in that I felt I had no control over the water heating.

Someone explain....help....please :?
 
Probably just a 'pump overrun' ... where the boiler will run the pump for 5/10minute after you've turned off the hot water/heating, to remove the sitting heat from inside the boiler.
 

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