How Long Does It Take for a Solar Heated Pool to Warm up?

DIY Pool Heaters take 5 hours to heat up the water up to 5 Degrees Celsius 

Branded solar pool heaters take 4 hours to heat the water up to 10 Degree Celsius 

These are average results. It depends on temperature, quality of pool heater, size of pool 

There are many non-solar methods of warming water in winter 

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