We sell all types and manufacturers of pool heaters.  Below are our recommendations, but we also support   Hayward, Pentair, and many other brands.
We recommend Aquacomfort heat pumps for superior reliability, longevity, and local customer support (Manufactured in Sykesville, MD).

We recommend Raypak Gas Heaters because they are recognized as a leader in product reliability and customer service and they have the best performing products on the market.  Plus, with simple design, and easy serviceability, this heater will last a long time.