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Hot Tub · Ofgem 1 July to 30 September 2026

4-person hard-shell hot tub running cost — Party/summer weekend (4 h)

Long weekend sessions of 4 hours — typical summer party use. A 4-person hard-shell hot tub (3,000 W heater + 1,500 W pump) costs approximately £12.53/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).

4-person hard-shell hot tub — Party/summer weekend (4 h): Active: 18.00 kWh (4 h × 4.5 kW). Standby: 6.00 kWh (20.0 h × 3.0 kW × 10%). Total/day: 24.00 kWh = £6.27. Weekly (2 days): £12.53. Annual: £651.71. Source: Which? — How much does a hot tub cost to run (electricity consumption data) + Ofgem (OGL v3.0).

Per day (used)
£6.27
Per week (2 days)
£12.53
Per month
£54.31
Per year
£651.71

Tub specification

Seats
4 adults
Heater
3,000 W
Pump
1,500 W
Active use
4 h/day
Standby load
10% of heater
Days used/week
2

Hydropool / Caldera typical 4-person hard-shell: 3 kW heater + 1.5 kW pump (Which? 2024)

How the cost is worked out

  1. Active use: (3,000 W + 1,500 W) ÷ 1000 × 4 h = 18.00 kWh.
  2. Standby: 3,000 W ÷ 1000 × 20.0 h × 10% = 6.00 kWh.
  3. Daily total: 18.00 + 6.00 = 24.00 kWh × 26.11p = £6.27.
  4. Weekly: £6.27 × 2 days = £12.53.
  5. Annual: £12.53 × 52 = £651.71.

Same scenario — other tub sizes

2-person inflatable hot tub: £4.18/wk4-person inflatable hot tub: £7.83/wk6-person hard-shell hot tub: £22.98/wk

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.