Global Swimming Pool Heaters Market Size, Share, Growth Analysis By Product Type (Electric Pool Heaters, Gas Pool Heaters, Solar Pool Heaters, Heat Pumps), By Pool Type (In-ground Pools, Above-ground Pools), By Fuel Type (Electric, Natural Gas, Solar, Propane), By Application (Residential, Commercial), By Region and Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Statistics, Trends and Forecast 2026-2035