Dual tariff Immersion on economy 7

[ΩΩΩ]

Hello.
What is the best way to control an immersion that has two elements with an economy 7 tarriff
The bottom element is on the off peak supply
The top element is on the peak supply.

Both are controlled by a simple switch.
Is it just best to leave the off peak switched on all the time, and let that heat the water, until the thermostat stops calling?

Would it be a good idea to add a timer function on the peak supply.
Should the off peak also be timed?
If so, what would people recommend for a timer to control both supplies

Thanks.

 

[Harry Bloomfield]

Is it just best to leave the off peak switched on all the time, and let that heat the water, until the thermostat stops calling?

Yep, have it set to take a full charge, every E7 period, you are in the house.

Would it be a good idea to add a timer function on the peak supply.
Should the off peak also be timed?

The usual method is to have a 'one shot' button - you press the button and it brings the top section of the cylinder up to temperature and shuts down. You can buy special controls for this, someone will provide a link.

 

[flameport]

If the off peak supply is only energised during those hours, just leave it on all the time.

The peak supply should rarely be required, and if you are concerned about someone leaving it on, install one of these or similar: https://www.tlc-direct.co.uk/Products/SGPSB2.html