Millions of TVs and videos will be dumped following the switch-over to digital television, a survey suggests.
The whole of the UK will be fully digital by 2012
Eight million machines - enough to fill 100 Olympic swimming pools - will be ditched, it estimated, based on a poll of 2,500 UK adults.
Almost half of households do not know video players will not work in the same way when the analogue signal stops.
One in five video recorders will be abandoned, possibly causing environmental damage, says uSwitch.com.
When the signal changes viewers will no longer be able to watch one channel while recording another, the independent switching service explains.
The company estimates that the cost of replacing these VCRs with digital recorders will exceed £1.1bn.
Of the 25 million TV sets yet to "go digital", nearly five million are incapable of receiving a digital signal.
The national bill to make TVs work will exceed £2.2bn.
Fifteen per cent of households plan to throw their old sets away, the poll of 2,599 UK adults shows.
Steve Weller, head of communication services at uSwitch.com, says: "Not only is the switch-over costing the nation significantly more than the low cost of a Freeview box, but the potential environmental impact of the discarded VCRs and TVs is shattering."
Authorities need to educate people about the change plus set up collection and recycling schemes, he adds.
Whitehaven in Cumbria will be the first place in the UK to switch to digital in October.