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Dual-flush toilets ‘wasting more water than they save’


Thames Water says produce is more more seemingly to leak as Waterwise warns 400m litres are being lost from UK toilets a day

Dual-flush buttons.

Thames Water says the topic is rising as more of us refurbish or retrofit older toilets with a dual-flush characteristic.
Photograph: Realimage/Alamy

Toilets specifically designed to set up water are wasting higher than they preserve, the UK’s greatest water firm has warned.

Campaigners maintain warned for years that dual-flush toilets, launched as more ambiance excellent decisions that had been anticipated to make utilize of now not as a lot as half the volume of water per flush, are more inclined to leaks.

The realm is expounded to be so wide that the costs are outweighing the benefits.

“Attributable to there’s so many loos that continuously plod at the side of the high-tail all the diagram by means of the day and evening, collectively that water loss is now exceeding the volume of water the twin-flush produce ought to be saving,” said Andrew Tucker, water efficiency manager at Thames Water.

“The volume of water loss is getting bigger each day as more of us refurbish and retrofit older toilets and as more properties are built, so it’s a rising area.”

The selling campaign neighborhood Waterwise has estimated that about 400m litres of water leak from UK toilets each day. It says that might be adequate to originate 2.8 million of us; comparable to the blended populations of Edinburgh, Cardiff, Belfast, Manchester, Sheffield, Liverpool and Bristol.

The neighborhood has said that a single leaking lavatory wastes a median of between between 215 and 400 litres of water per day and that between 5% and 8% of all toilets are leaky. And the massive majority of those utilize the more moderen dual-flush mechanism.

Thames Water said miserable produce and materials cause water to transfer with the high-tail continuously into the bowl. And, in step with the BBC, the Lavatory Manufacturers Association has acknowledged that the produce of many dual-flush toilets is inherently more inclined to leakage.

The bulk of them utilize the fall valve machine, which sits at the backside of the cistern and opens to enable the water to transfer with the high-tail out when the flush is pressed. Particles and varied points can cause the mechanism to fail to shut, that diagram water frequently flows from the cistern and into the bowl.

Older cisterns tend to make utilize of a siphon machine, which works by pushing water upwards till it reaches a degree at which it might per chance most likely plod at the side of the high-tail into the bowl. Attributable to that point is above the waterline when the lavatory is now not being flushed, the machine is less more seemingly to own the identical originate of leak.

“A siphon is now not going to leak whereas an outlet valve – if we watch at the figures we’ve received – they might per chance also leak within per week of installation. It’ll be two years but they will leak,” said Jason Parker, the managing director of Thomas Dudley Ltd, one of many UK’s greatest plumbing manufacturers.

He instructed the BBC: “If we’re brooding about wasting water and we would like to end it, the suitable methodology to manufacture that is put a siphon assist in.”

Twin-flush toilets maintain two buttons that enable varied portions of water to transfer with the high-tail. They veritably put out four or six litres, with the smaller quantity meant for clearing urine.

Waterwise has said that fixing leaky toilets might per chance also “make a contribution round 10% of the extra water skill wished to manage with an excessive drought in England by 2050”.

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