Scottish Renewables found 921 million litres of waste water and sewage were flushed down toilets and plugholes in Scotland every day.
It said water in UK sewers can be as warm as 21C (69.8F).
The group claimed heat pumps and waste water recovery systems could harness that energy potential.
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See how similar technology can warm your home using the latent heat in the air – even in winter! Read more…