What is heating my water?

[dunin]

Hello

I'm experiencing a strange issue here.
I live in a flat which has water tank with immersion heater + electric shower in the bathroom. I only turn ON immersion heater when I want to have a bath so 99,99% of the time the water from the taps (kitchen + bathroom) is cold.
Today I have noticed that it's hot and the water tank is hot as well! However the immersion heater is definitely OFF and I know it because whenever I turn it on, there is a characteristic sound inside the tank.
My electric shower has recently been replaced, but it might just be coincidence.

Any ideas what is heating my water??


Many thanks

 

[Howsie]

Hi,

What heats your property?

 

[dunin]

Hi

Nothing,there is no central heating

 

[rocketmanbkk]

Elec heaters?

Have you 2 switches in your airing cupboard where the hot water cylinder is?

If so, ones sure to be heating water on cheap rate electric at night & there's your hot water.

Ta daaa

 

[joni os]

Never trust a switch to be off until its disconnected. I suspect you still have some joules creeping round immersion heater.

 

[dunin]

I have only 1 switch and it's off, even the light comes off.

 

[rocketmanbkk]

Very strange indeed then

How old the flat?

 

[dunin]

Well I can't really tell to be honest , but my windows are still single glazed ! So must be "older" what if I shut the mains ,wait an hour and see if the tank cools down, if yes then it must be the immersion heater

 

[rocketmanbkk]

If it is only heated by the immersion then there's nothing else that's going to hear it.

Unless it's magic!!

 

[joni os]

Rocketman making sense. It could be isolator for low tariff near consumer unit and electrician switched it back on after shower install.

 

[dunin]

Any ideas where that low tariff switch might be if not in the airing cupboard ?

 

[dunin]

Because I don't really believe that my immersion heater has low tariff option

 

[ShaunCorbs]

Because I don't really believe that my immersion heater has low tariff option

bit of a long shot but could you post a pic up of your cylinder and immersion

 

[dunin]

bit of a long shot but could you post a pic up of your cylinder and immersion

 

[Masood]

Can we see the other end of that cable, and the distribution board / fuse board area?

 

[Masood]

Rocketman making sense. It could be isolator for low tariff near consumer unit and electrician switched it back on after shower install.

Most likely scenario I reckon.

 

[dunin]

Hi,

Just a switch with a light to indicate that its on, nothing else

 

[Radioman]

Can you post a picture of the electric shower in the bathroom and shower isolator switches, and the consumer unit ( fuse board) and the fuse for the shower inside the board. My guess is that the shower wiring is the problem. Out of interest was the shower replaced by a qualified man? Are you a tenant or an owner?

When you say the water is hot do you mean over 60 deg or just warm?