Eon billing

Scot_39

Except day rate heating on a multi rate tariff with a high peak / off-peak price ratio - like EDFs > 2:1(*).

And the OP says son is going for a single rate meter - to drive the new heaters - so at least I hope avoiding that problem.

(*) Say one of EDFs regional prices in range c 38-40p day vs c14-16p night vs c30p single rate.

If going to use non storage heating only (because that is what son is having fitted) say - M-F in evenings it's better to pay the 30p - than pay the c40p style peak day rate.

And if son out 8-10 hours a day at work most days - sleeps say another 8 - that well might be something that can at least mitigate the potential average unit rate cost increase.

By dropping overall energy consumption on heating.

But only essentially really by running lower average temperatures in unoccupied rooms (so I hope the new ones have flexible control) - than his NSH were allowing him to.

Yes modern HHRs may be able to achieve that too - and on a cheaper input off peak unit rate - but at significantly greater purchase costs (1 Quantum RF 150 and 2 70s would be c£2500 - not £800).  And with threats of £1000s in EOn bills hanging over son's head - a difficult thing to justify right now.