If you heated your swimming pool during the winter you would need a 2500 gal propane tank. 400,000 BTU runs about 4 gallons of propane an hour. Figure over 50 gallons a day. Propane tanks can’t be fully filled. it would last one month in the winter just for the pool. They should get two.
“ 400,000 BTU runs about 4 gallons of propane an hour. ”
What are you doing with THAT pool? Making soup? Lol