unvented cylinder and economy 7

[OvertonPlumber]

hi all my rare visit into here.

I have a tenented premises that has an old style meter black thing with dials with a newish consumer board. the landlord has asked me to fit a direct unvented cylinder. Obviously it would be best to get the electricity supplier to change the meter for a dualrate meter/economy7. Any idea how much this would cost.
I assume we would also need an additional board for the economy 7.
any electrical work will be carried out by nic sparkies not me.

 

[Steve]

Having a cylinder doesn't nessecarily mean you need eco7. Are there storage heaters?

 

[Zambezi]

AFAIK a supplier will change your meter for free if you go onto (or off) E7.
E7 is not any cheaper unless you use 40% or more of your total power off peak. So as Steve said, are the night storage heaters in the property?

 

[Stoday]

E7 is not any cheaper unless you use 40% or more of your total power off peak.

I don't know of any suppliers where that's the case. It's normally around 15% because a typical domestic user would use 15% of his total kWh during the E7 low rate periods. Then plus an extra standing charge to cover the cost of a time or radio tele switch.

Sometimes the extra standing charge is buried in the day kWh or a primary block of kWh.