Economy 7 Quartz Help Required

[Stok999]

Hello I have been using my E7 for just under a year and decided to move the water timer from 12 till 6 which including my heating uses roughly 18 units. I have moved it to 3 while 7 and the units used has jumped up to 55 units. The timer is right so have no idea why this is.. Does anyone have any ideas

 

[JohnD]

Do you mean 55kWh? For the water heater?

That is about ten bathfuls of hot water. Does this include room heaters? Or just the hot water?

Have you got a hot water cylinder?

What colour?

Perhaps you have a hot water leak or a faulty thermostat.

Is your tap water scalding hot?

 

[Stok999]

Hi John
Yes it's 55 kwh usually 18 and yes this does include my heating but on 3 of them. I'm unsure why just adjusting the blue and red markers for timing has caused such a big difference. The water cylinder limey green colour pic attached. Yes the hot water is scalding but its always been like that why its changed so much overnight.
Many thanks for your help with this
M

 

[JohnD]

Yes the hot water is scalding but its always been like that

I think you have a faulty thermostat on your immersion heater. This can be extremely dangerous and has been the cause of some horrible and fatal accidents. The reports are very distressing and I prefer not to add them. You will not want to read them if you are a parent. Please turn it off and do not run it for periods exceeding 90 minutes.

Unless you are handy, please call a competent and established plumber.

It may also be possible for you to repair it yourself. Start by turning off the power at the main switch, and unscrewing the screw on the plastic cap of the immersion heater, then photograph the contents. It would be best if you obtain a multimeter first.

 

[ericmark]

In the main electric domestic hot water has four devices.
An element
A thermostat
A cut out
A timer
If the thermostat fails the cut out should operate, some can be reset, some need renewing, and some times they are missing, one hope's that is rare.

In the main the timer is so you heat the water using off peak rate, but the Willis system mainly found in Ulster is an odd one out, heating the tank from the top down, and the longer it runs for the more hot water you get.

As @JohnD says it rings alarm bells, if the lower tank over heats it can heat up the upper tank as well, if the upper tank is made from steel or thermal setting plastic it will normally push water out of the over flow, but thermal plastic tanks have been known to split, and 40 gallons of nearly boiling water through ceiling is not good.

Easy enough to go in the loft and check if cold water tank is getting hot.