Energy check · Free · 30 seconds

Less energy.
More swimming.

Calculate live how much heating energy a custom-made ROLLO SOLAR pool cover saves for your pool — based on the calculation model of the Fraunhofer Institute for Building Physics.

Over 40 years of experience 30,000+ projects Made in Germany

1 — How big is your pool?

50 m² of water surface
Width5 m
Length10 m

2 — Desired water temperature

28°C · Komfortabel
20° cold26° pleasant32° hot

3 — When do you use the pool?

JanFebMarAprMayJunJulAugSepOctNovDec

4 — How do you heat your pool?

5 — Daily swimming time (pool open)

4 hours open

Outside swimming hours the cover stays closed. The animation next to it shows your setting.

Your pool 5 × 10 m · top view
Cover open approx. 4 h per day
Your annual energy savings
35.992 kWh
per season · up to this in 10 years: 359.916 kWh
71 %less heating energy
14,4 tCO₂ avoided
61.720 Lless evaporation
14.786 kWhremaining demand with cover
Without cover50.777 kWh
With ROLLO SOLAR pool cover14.786 kWh
Configure your cover now Or book a consultation
Energy balance

Where do the savings come from?

Up to 70 % of a pool's heat losses are caused by evaporation. A closed cover stops this effect almost completely — with transparent profiles, part of the solar gains is preserved.

Without coverWith ROLLO SOLAR
Evaporation lossesbiggest factor
49.993 kWh
8.332 kWh
Radiation lossesheat radiation upwards
16.423 kWh
8.320 kWh
Convection losseswind across the surface
15.116 kWh
7.501 kWh
Ground lossesindependent of the cover
2.386 kWh
2.386 kWh
Fresh water supplyrefill at 15 °C
1.116 kWh
186 kWh
Solar gainsenergy gain
− 34.257 kWh
− 11.940 kWh
Heating demand without cover: 50.777 kWh with cover: 14.786 kWh Savings: 35.992 kWh
About this calculation

Calculation basis: the energy balance is based on the scientific calculation model of the Fraunhofer Institute for Building Physics (EDA-F 2.02, licensed to ROLLO-SOLAR Melichar GmbH). The calculation considers all relevant energy flows: evaporation, radiation, convection, ground losses, fresh water supply and solar gains.

Climate data: test reference year (TRY) Würzburg with monthly averages for global radiation, air temperature and dew point. Actual values may vary depending on location and weather.

Fixed assumptions in the calculator:
  • Wind speed: 0.5 m/s (sheltered location)
  • Fresh water temperature: 15°C
  • Pool depth: 1.50 m
  • Ground temperature: 10°C
  • Coverage: 99.4% of the water surface (3 cm edge distance)
Energy prices (2024/2025, averages):
  • Electricity: 0.30 €/kWh
  • Natural gas: 0.12 €/kWh (gas boiler efficiency: 90%)
  • Heating oil: 1.00 €/litre ≈ 0.10 €/kWh (oil boiler efficiency: 85%)
  • Heat pump: 0.30 €/kWh electricity at COP 4 ≈ 0.075 €/kWh heat

Important note: the values shown are rough guide values for orientation. Actual savings depend on many individual factors such as location, weather, usage patterns, actual energy prices and system efficiency. The calculation does not replace individual consultation. Energy prices fluctuate strongly – please check current prices with your supplier.

Design. Pool. Cover.
Your savings potential is calculated — have your cover custom-made now.
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