Increased power and affordable purchase, Stratos is versatile and suitable for many sizes of above-ground and in-ground pools. Robust and quiet, it has an excellent warranty. The Stratos will work with any type of circulating pump and any type of water sanitation system. Designed and manufactured in Quebec, Canada. It is 75% less expensive than natural gas to run! This makes a heat pump the most economical, safe and trouble-free way to heat your pool.