Immersion heater switch that switches itstelf off after 1 hour?

[AL_n]

I'd like to find a wall switch for my immersion heater - one that automatically switches off, about one hour after it was switched on. Has anyone sean such an item for sale anywhere?

Thanks,

Al

[ARWadsworth]

Are these suitable?

[Peter Andrews]

[Roger Mills]

There was a thread abut this only a week or so ago. I think someone was looking for a time switch for an air-con system, and someone came up with this immersion heater timer as a suggestion:

might just do what you want.

[The Wanderer]

Depends what you *actually* want it for and how much you're prepared to pay. Several others have given urls for 'one shot' timers. If you're on E7 then you should look for an E7 timer.

These give you an automatic setting for the cheap rate with a one or two hour auto or manual boost.

[John]

Check that the thermostat is set sensibly. Often people try to control the temp with time - when it is often a symptom that the thermostat needs turning down.

[george [dicegeorge]]

How can one tell when the water is at full heat temperature?

I just had a bath after having it on for about 40 minutes but it wasn't hot enough, after a while the hot tap became cold...

[g]

[Roger Mills]

Feel the cylinder - it should be hot all the way down. Hot water rises to the top, so if only the top part of the cylinder is hot, the bath water will run cold as soon as that is used up. [Of course, if the cylinder isn't large enough the water will run cold when it's all used up even if it *is* hot all the way down!]

[AL_n]

"ARWadsworth" wrote in news:1qnxo.8$ [e-mail]:

Yes - thank you. SM TGBT4 looks like it does what I need it to. I'd like to find something cheaper if poss. Sorry to be such a skinflint. It juat needs to keep the heater on for one hour.

Al

[AL_n]

The Wanderer wrote in news:9ry0f8tryicc$.1sr548tkemj9w$. [e-mail]:

Thanks - that's interesting, however I'm not on Economy 7. I need the thing to work at any hour of the day or night.

Al

[AL_n]

"John" wrote in news:tOwxo.14969$ [e-mail]:

Already done, thanks. It is set optimally.

Al

[AL_n]

"george [dicegeorge]" wrote in news:ia6sf6$1m1d$1 @news.enta.net:

Well, all systems are going to differ. I know from trial and error that my immersion heater gets the water to full temp in one hour (approx). Sounds like your system needs more than 40 minutes too. Try one hour.

Al

[ARWadsworth]

Unless you own a cotton plantation with a couple of spare black slaves then the electronic timer is the cheapest way to do the one hour timer.

Adam

[AL_n]

"ARWadsworth" wrote in news:J%Hxo.229$ [e-mail]:

I came up with a cheaper way!! I bought one of those 1-hour clockwork kitchen timers for £3. Now, I switch the immersion heater and set the timer simultaneously. In 1 hour, the timer starts ringing. I immediately go and switch the heater off and take my shower. I anticipate that this routine should be even better than the electrinic timer, because of the addition of the ringing bell, advising me that the water has been heated. We'll see how it works in practice.....

Al

[Mathew Newton]

...Although the effectiveness of this technique does depend on the cylinder. Our sealed cylinder is so well insulated that there is no discernible difference between top and bottom; certainly not enough to work out the relative proportion of hot to cold.

Mathew