How to choose btu for pool heat pump

What is a comfortable pool temperature?

78 to 86 degrees Fahrenheit
According to the World Health Organization, water temperatures ranging from 78 to 86 degrees Fahrenheit are generally comfortable and safe for those engaging in moderate physical activity in a pool.

What water temperature is too hot for swimming?

Swimming in water that is too warm — over 90 degrees Fahrenheit — can lead to overheating and exhaustion — particularly when you are exerting yourself by swimming several laps or a marathon. Warm water increases your body temperature, which also raises your sweat rate and quickens dehydration.

What does BTU mean for pool heaters?

British thermal units
Before we start, it is important to understand that it does not matter what kind of heater you are talking about — all pool heaters are measured in Btu (British thermal units), which measures the amount of heat (energy) required to raise the temperature of one pound of water by one degree Fahrenheit.

How many BTUs do I need to heat my pool?

To maintain the temperature, you need about 10 BTUs per hour, per square foot of surface, per degree above the air temperature. That means keeping a pool with a surface area of 300 square feet at 80 F (27 C) degrees in 60 F (15 C) degree weather would require 60,000 BTU per hour.

140,000 (140k) BTU pool heat pump will heat a pool of 20 x 40 from 60°F to 80°F in 21 hours and maintain the temperature.
120,000 (120k) BTU for a pool of 25,000 gals.
110,000 (110k) BTU for a pool of 21,000 gals.
85,000 (85k) BTU for a pool of 17,000 gals.
50,000 BTU, will heat a 10,000 gal. pool from 60°F to 80°F in 30 hours.

Heat Pump Sizing Chart – Above Ground Pools

Pool Size (Feet) Summer
4 BTU’s
Spring & Fall
5 BTU’s
6 BTU’s
Up To 10,000 Gallons
Up To 21′ Round or 15′ x 26′ Oval
50,000 BTU 50,000 BTU 65,000 BTU
Up To 13,000 Gallons
Up To 24′ Round or 15′ x 30′ Oval
50,000 BTU 65,000 BTU 85,000 BTU
Up To 17,000 Gallons
Up To 27′ Round or 18′ x 33′ Oval
65,000 BTU 85,000 BTU 110,000 BTU
Up To 21,000 Gallons
Up To 30′ Round or 18′ x 40′ Oval
85,000 BTU 110,000 BTU 125,000 BTU

Heat Pump Sizing Chart – Inground Pools

Pool Size (Feet) Summer
4 BTU’s
Spring & Fall
5 BTU’s
6 BTU’s
Up To 10,000 Gallons
12′ x 24′
50,000 BTU 50,000 BTU 85,000 BTU
Up To 15,000 Gallons
14′ x 28′
85,000 BTU 85,000 BTU 110,000 BTU
Up To 20,000 Gallons
16′ x 32′
85,000 BTU 110,000 BTU 125,000 BTU
Up To 25,000 Gallons
18′ x 36′
110,000 BTU 125,000 BTU 150,000 BTU
Up To 30,000 Gallons
20′ x 40′
125,000 BTU 150,000 BTU  

What is the largest BTU pool heat pump?

145,000 BTU

How long does it take to heat a pool 5 degrees?

Your pool = 6,423 gallons x 8.34 lbs/gallon =~53,500 lbs of water. I assume the 210 model is 210,000 btu’s. That means the heater will add ~210K btus per hour. And you will 53,500/210,000 = 3.9 degrees per hour or ~1.3 hours for 5 degrees.

Can a heat pump heat a pool to 90 degrees?

We have seen most pools at a temperature of 86°-88° degrees Fahrenheit (30°-31° Celsius), but have known some to get in the upper 90°s (32° Celsius). Most spas are heated higher than that, some even to the limit of 104° degrees Fahrenheit (40° Celsius) All heat pumps have a limit of 104° (40° ) for safety reasons.

Is a higher BTU pool heater better?

It is true that larger heaters heat your pool faster than smaller ones. A 400k BTU heater will heat a pool twice as fast as a 200k BTU heater and burn gas twice as fast. Heating up a pool versus a pool/spa combination requires less BTU power.

Why is pool water cold on a hot day?

Water temperatures are slow to heat up, and just as slow to cool down. Water is very “stubborn” to change temperature. It takes 4 times the energy to heat up water than to heat air. Water also “feels” colder because water is a more efficent medium than air to cool our body down.

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