While hot tubs hold more water than a typical bath, the cost and environmental impact of filling them are often lower than people expect. Understanding volume and water management can save you money and reduce waste.
Water volume and cost
- Volume: Many domestic hot tubs hold around 1,500–1,700 litres. For comparison, a standard household bath holds about 80–100 litres.
- Cost: In the UK, metered water costs about 88p per 1,000 litres. Filling a 1,500‑litre tub therefore costs roughly £1.50.
- Refill frequency: Basic tubs without independent filtration need water changes every 2–3 months to maintain water quality. Advanced eco‑smart filtration systems allow you to change water every 6–9 months, saving thousands of litres each year.
Conservation and reuse
- Greywater use: Some owners repurpose drained hot‑tub water to irrigate gardens or flush toilets (check local regulations). Tubs hold enough water to irrigate a small garden for several days, reducing overall household water use.
- Good covers save water: A well‑fitted cover reduces evaporation, meaning you won’t need to top up as often.
- Choose eco‑smart filtration: Tubs with independent programmable filters and low‑chlorine treatments allow for water changes only twice a year, saving thousands of litres.
Summary
A hot tub’s water cost is minor compared with other running expenses. By using a good cover, maintaining water chemistry and investing in efficient filtration, you can keep refills to a minimum and conserve water.
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