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Pool-Pump Electricity Cost per Cubic Metre Calculation

Quick Engineering Answer:

To calculate the electricity cost per cubic metre circulated: Cost = (Input Watts / 1000) * (Tariff in R/kWh) / (Flow rate in m³/h). A Tradeflo 0.75 kW pump drawing 0.98 kW and delivering 18 m³/h on a typical R3.50/kWh municipal tariff costs just R0.19 per cubic metre circulated, compared to R0.32/m³ on older inefficient pumps.

Technical Overview & Sizing Principles

Mathematical formula for calculating water circulation efficiency and monthly Eskom / municipal electricity expenses. In Southern Africa's demanding climate, water circulation systems must account for elevated water temperatures, high summer ambient heat inside enclosed pump housings, pipework friction losses, and seasonal lightning surges.

Engineering Comparison Table

Pump ModelInput Power (kW)Average Flow (m³/h)Energy Consumed per 100m³Cost per 100m³ (@ R3.50/kWh)
Legacy Non-IE2 0.75kW1.25 kW14 m³/h8.93 kWhR 31.25
Tradeflo 0.56 kW (ADR-007)0.75 kW13 m³/h5.77 kWhR 20.19 (35% Savings)
Tradeflo 0.75 kW (ADR-008)0.98 kW18 m³/h5.44 kWhR 19.04 (39% Savings)

Best Practice Installer Recommendations

  • Plumbing Diameter: Always utilize 63mm suction plumbing where pipe runs exceed 10 metres to keep fluid velocity under 1.8 m/s.
  • Ventilation: Ensure fibreglass pool boxes provide at least 150mm clearance around the motor cooling cowl for airflow.
  • Filter Matching: Never exceed the maximum recommended flow velocity of the silica sand bed (D500: max 12 m³/h; D600: max 18 m³/h).
Published by: UPP Pumps Engineering Desk (KZN) Review Date: August 2026 • Rev 2.1
Note: Calculations are based on clean plumbing at sea level. High-altitude installations require standard derating.
Relevant Products
Tradeflo Pool Pumps (0.56 – 1.12kW) Agriflo Saltwater Pumps Tradeflo D500 & D600 Filters Drop-in-Drive Direct Retrofits
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