I would recommend 1 HP
If you are asking about a 27' circumference pool, then the answer is 27'
Either a 50 OR A 75 would do it.
A 27-foot wide by 52-inch-deep round pool holds a maximum of about 18,551.7 gallons of water.
12'
21 inches of water in a round pool that is 27 feet 3 inches across is about 7,667 gallons.
It nearly cost above hundred dollars to replace liner in 27 foot round 48in deep beaded pool
a 27 foot round by 52 inch deep pool holds 18,550 gallons of water
This pool holds a maximum of 18,560 gallons of water.
400,000 btu's minimum ...pat What Pat is not considering is the size of your gas meter or the gas line to the equipment pad if there is one. If you are starting from scratch you still need to know the gas meter size and the length and diameter of the gas run. Absolutely critical to heater installations. Because of the existing gas line and meter you may be limited as to the size or BTU of the heater. k
About 17,204 gallons.
17,204 gallons.