Most people know, somewhere in the back of their mind, that toilet paper isn't free. They buy it every week or two, it vanishes, and they buy it again. It's one of those expenses that feels negligible because each individual purchase is small - a few pounds here, a multipack there. What's much harder to see clearly is what those purchases add up to over a year, a decade or a lifetime.
Once you run the numbers properly, the picture looks quite different. And when you set those numbers against the running cost of a smart toilet, the financial case for making the switch becomes considerably more compelling than most people expect.
If you're new to the idea of Japanese-style smart toilets and want to understand what they are before diving into the economics, Washloo's Japanese Toilet Guide is a good place to start; it covers features, formats and what to expect from the experience.
What the UK Actually Spends on Toilet Paper
A 2025 analysis by Victorian Plumbing found that the UK's most popular toilet paper brand costs the average household £428 per year; that’s £35.16 per month, or just over £107 per person annually. Over an 80-year lifetime, that works out at more than £8,500 per person, just on toilet paper.
That's the brand most people buy. The UK average across all purchasing patterns, including those who opt for cheaper supermarket own-brand, sits somewhat lower. Either way, the annual cost of toilet paper in a British household is measured in hundreds of pounds, not tens.
To put that in perspective: the UK as a whole spends close to £3 billion on toilet paper every year. We use almost two and a half times the European average. We're fussy about the quality. We have strong opinions about something we use for a few seconds and flush away.
What a Smart Toilet Costs to Run
The water used by a bidet toilet seat wash cycle is minimal.
The wash cycle uses a small, controlled burst of warm water. The volume per use is a fraction of what a toilet flush uses, and significantly less than the water required to produce the toilet paper being replaced. Running the dryer cycle adds a small amount to the electricity bill, which is negligible at scale.
The smart toilet itself does use electricity for the heated seat, the controls and the electronics. Washloo's seats feature an energy-saving standby mode that reduces power consumption when the toilet isn't in use, lowering electricity costs to a modest ongoing figure.
The result is that the ongoing running cost of a smart toilet is a small fraction of what a household currently spends on toilet paper. For most households, the product pays for itself over time by eliminating that recurring spend.
The Break-Even Calculation
The Washloo Classic, as an entry-level smart toilet seat, represents the most accessible price point in the range. Against an annual toilet paper saving of, conservatively, £200 to £270 per year for a typical household making a full switch, the maths for recovering the initial cost is straightforward.
It's worth being honest about one nuance here: most households don't go entirely paper-free immediately. Some people keep a small amount of toilet paper for guests, for children still developing habits, or for their own initial adjustment period. The full savings take time to materialise in practice but even a partial switch (where toilet paper use drops by 70 or 80%) produces meaningful annual savings.
At the premium end of the range — the Washloo Finesse, Prestige, or an all-in-one smart toilet — the payback period is naturally longer. But the calculation for these products isn't purely financial. People buying at this level are typically weighing a broader set of benefits: hygiene, health, independence and the quality of their daily routine. The financial case is a supporting argument, not the whole one.
The Environmental Numbers Are Even More Striking
The financial case is interesting. The environmental one is harder to ignore.
Producing a single roll of toilet paper requires approximately 37 gallons of water. That's 168 litres for a product used once. The average adult gets through roughly 100 rolls a year, which means their personal toilet paper habit accounts for around 16,800 litres of water in production alone, every year, before a single drop has gone through the tap.
Over a lifetime, the average person in the UK will use the equivalent of 384 trees' worth of toilet roll. Globally, around 10 million trees are felled each year specifically for toilet paper production. Much of this comes from virgin pulp (freshly logged timber, not recycled fibre), and a significant proportion comes from boreal forests in Canada and Russia, ecosystems that are among the most carbon-dense on the planet. Toilet paper made from virgin fibre releases three times as much carbon as paper made from recycled materials, according to environmental analysis from the Environmental Paper Network.
The production process itself is energy-intensive: bleaching, processing, rolling, packaging, and transporting a product that weighs almost nothing but is bought in enormous volumes. One estimate puts the electricity required to produce the world's toilet paper at 17.3 terawatts annually — enough to power millions of homes.
By contrast, a bidet toilet seat uses water that is already in your supply system, heated briefly within the unit, and delivered in a small, controlled amount. There are no trees. No industrial processing. No packaging. No transport chain from forest to mill to warehouse to supermarket to your bathroom. Just water from the tap, used efficiently, and warm air from a hand dryer-sized dryer.
The environmental difference between the two approaches is not marginal. It is substantial.
What the UK's Own Values Say About This
The 2015 survey cited in Washloo's Japanese Toilet Guide found that 81% of British toilet paper buyers said they would consider switching to recycled tissue if the quality were comparable. That's a significant majority of people signalling environmental concern, but still reaching for a product that requires trees, water, energy and packaging to produce.
The gap between stated environmental values and actual purchasing behaviour is one of the more studied phenomena in consumer psychology. It's sometimes called the "green gap" — the distance between caring about sustainability and actually changing habits. In the case of toilet paper, the habit is deeply ingrained, the switch requires a bit of adjustment, and the alternative hasn't always been visible or accessible enough to make the decision easy.
What's changed is that the alternative is now both visible and accessible. A Washloo smart toilet seat fits onto an existing toilet, requires no plumbing work, and can be ordered and installed in a single afternoon. The barrier to making the switch has come down considerably, which is why adoption is accelerating.
Frequently Asked Questions
Does switching to a smart toilet mean giving up toilet paper entirely? Not necessarily, and certainly not immediately. Most people reduce their toilet paper use significantly rather than eliminating it entirely in the first instance. Over time, many households find they use toilet paper only occasionally or not at all.
Is the water used by a smart toilet wasteful? No. The water used per wash cycle is small and controlled, and it is far less than the water required to produce the toilet paper it replaces. Each roll of toilet paper requires approximately 37 gallons of water to manufacture; the wash cycle on a bidet seat uses a small fraction of that per use.
How long before a smart toilet seat pays for itself? That depends on the product price and the household's current toilet paper spend. At a mid-range price point and a conservative annual toilet paper saving of £200, the product pays for itself within a few years, with savings continuing beyond that indefinitely.
Is the environmental benefit of a smart toilet significant enough to matter? Yes. Eliminating virgin pulp toilet paper from a household removes a meaningful source of ongoing resource consumption (trees, water, energy and packaging) from that household's footprint. At scale, across millions of households, the impact is substantial.