4-person inflatable hot tub running cost — Summer daily use (1.5 h, warm ambient)
Summer daily use: lower maintenance fraction (5%) because warmer ambient temperature reduces heat loss. A 4-person inflatable hot tub (1,500 W heater + 1,500 W pump) costs approximately £11.31/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
4-person inflatable hot tub — Summer daily use (1.5 h, warm ambient): Active: 4.50 kWh (1.5 h × 3.0 kW). Standby: 1.69 kWh (22.5 h × 1.5 kW × 5%). Total/day: 6.19 kWh = £1.62. Weekly (7 days): £11.31. Annual: £588.06. Source: Which? — How much does a hot tub cost to run (electricity consumption data) + Ofgem (OGL v3.0).
- Per day (used)
- £1.62
- Per week (7 days)
- £11.31
- Per month
- £49.01
- Per year
- £588.06
Tub specification
- Seats
- 4 adults
- Heater
- 1,500 W
- Pump
- 1,500 W
- Active use
- 1.5 h/day
- Standby load
- 5% of heater
- Days used/week
- 7
Lay-Z-Spa Paris / Bestway 4-person published specs (2024): 1,500 W heater + 1,500 W blower
How the cost is worked out
- Active use: (1,500 W + 1,500 W) ÷ 1000 × 1.5 h = 4.50 kWh.
- Standby: 1,500 W ÷ 1000 × 22.5 h × 5% = 1.69 kWh.
- Daily total: 4.50 + 1.69 = 6.19 kWh × 26.11p = £1.62.
- Weekly: £1.62 × 7 days = £11.31.
- Annual: £11.31 × 52 = £588.06.
Same scenario — other tub sizes
Track hot tub running costs
Updated each time the Ofgem cap changes.
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Heater and pump specs from Which? — How much does a hot tub cost to run (electricity consumption data). Unit rate 26.11p/kWh from Ofgem — Energy price cap unit rates and standing charges (1 July to 30 September 2026), OGL v3.0.