How Long Does It Take To Heat A Pool Without A Heater. The process is very technical: Electric pool heaters just remember that external weather conditions can affect the heating capacity of an electric pool heater but don’t have to rely on sunlight, as solar heaters do, to heat your pool.
You will not save electricity by having a smaller heater, it will cost the same and just take longer to heat the pool. Overall, a heat pump usually requires between 24 and 72 hours to heat a swimming pool by 20°f (11°c) and between 45 and 60 minutes to heat a spa by 20°f (11°c). 10 x 1.33= 13.34 hours of heating before the pool reaches 80 degrees f.
It can take as many as three days to heat up a larger pool, if the outside temperature is much cooler than your desired pool temperature.
20,000 x 8.34= 166,800 lbs. The time it takes to warm an unheated outdoor swimming pool depends upon three factors: How long will it take before the pool water reaches 80 degrees f? 5000 gallon pool with a 200,000 btu heater.