Raypak pool heaters are one of the leading brands, pretty much a household name in the US. This is a company that has been around for a good long while (over half a century) and is American born and bred.
Raypak is one of those garage workshop turned big industrial manufacturer stories. The man who started up the firm did so from his garage in 1947; now the company HQ in Oxnard boasts 235 thousand square feet.
Like most companies these days, Raypak lays claim to innovation and quality. They do put their money where their month is however, and back in 96 became the first company of their kind to be awarded the International Standards Organization ISO 9001 for quality.
When it comes to pool heating they offer pretty much the works. They do not do solar pool heaters - this is, after all a boiler manufacturer!
But if you want pool heat pumps or standard but efficient electric pool heaters (SpaPak Electric Heaters), then Raypak will be able to fit you out.
They also have plenty of expertise in propane pool heaters (Versa Gas Heaters, Digital and Millivolt Gas Heaters). So whatever your need, Raypak are a quality-backed US company worth looking into.