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Hot Tub · Ofgem 1 July to 30 September 2026

6-person hard-shell 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 6-person hard-shell hot tub (6,000 W heater + 2,000 W pump) costs approximately £34.27/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).

6-person hard-shell hot tub — Summer daily use (1.5 h, warm ambient): Active: 12.00 kWh (1.5 h × 8.0 kW). Standby: 6.75 kWh (22.5 h × 6.0 kW × 5%). Total/day: 18.75 kWh = £4.90. Weekly (7 days): £34.27. Annual: £1782.01. Source: Which? — How much does a hot tub cost to run (electricity consumption data) + Ofgem (OGL v3.0).

Per day (used)
£4.90
Per week (7 days)
£34.27
Per month
£148.50
Per year
£1782.01

Tub specification

Seats
6 adults
Heater
6,000 W
Pump
2,000 W
Active use
1.5 h/day
Standby load
5% of heater
Days used/week
7

Hydropool / Jacuzzi 6-person hard-shell: 6 kW heater + 2 kW pump (Which? 2024)

How the cost is worked out

  1. Active use: (6,000 W + 2,000 W) ÷ 1000 × 1.5 h = 12.00 kWh.
  2. Standby: 6,000 W ÷ 1000 × 22.5 h × 5% = 6.75 kWh.
  3. Daily total: 12.00 + 6.75 = 18.75 kWh × 26.11p = £4.90.
  4. Weekly: £4.90 × 7 days = £34.27.
  5. Annual: £34.27 × 52 = £1782.01.

Same scenario — other tub sizes

2-person inflatable hot tub: £6.03/wk4-person inflatable hot tub: £11.31/wk4-person hard-shell hot tub: £18.51/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.