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Hot Tub · Ofgem 1 July to 30 September 2026

2-person inflatable hot tub running cost — Party/summer weekend (4 h)

Long weekend sessions of 4 hours — typical summer party use. A 2-person inflatable hot tub (800 W heater + 800 W pump) costs approximately £4.18/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).

2-person inflatable hot tub — Party/summer weekend (4 h): Active: 6.40 kWh (4 h × 1.6 kW). Standby: 1.60 kWh (20.0 h × 0.8 kW × 10%). Total/day: 8.00 kWh = £2.09. Weekly (2 days): £4.18. Annual: £217.24. Source: Which? — How much does a hot tub cost to run (electricity consumption data) + Ofgem (OGL v3.0).

Per day (used)
£2.09
Per week (2 days)
£4.18
Per month
£18.10
Per year
£217.24

Tub specification

Seats
2 adults
Heater
800 W
Pump
800 W
Active use
4 h/day
Standby load
10% of heater
Days used/week
2

Lay-Z-Spa Miami / Coleman SaluSpa published specs (2024): 800 W heater + 800 W blower motor

How the cost is worked out

  1. Active use: (800 W + 800 W) ÷ 1000 × 4 h = 6.40 kWh.
  2. Standby: 800 W ÷ 1000 × 20.0 h × 10% = 1.60 kWh.
  3. Daily total: 6.40 + 1.60 = 8.00 kWh × 26.11p = £2.09.
  4. Weekly: £2.09 × 2 days = £4.18.
  5. Annual: £4.18 × 52 = £217.24.

Same scenario — other tub sizes

4-person inflatable hot tub: £7.83/wk4-person hard-shell hot tub: £12.53/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.