Tankless Water Heater Market Size, Share & Industry Analysis, By Energy Source (Gas [Condensing and Non-condensing], [Below 8 Liters/Min, 8-15 Liters/Min, and Above 15 Liters/Min] and Electric [Below 6 KW, 6-12 KW, and Above 12 KW]), By Project Type (New Installation and Replacement/Retrofit), By Smart/Connectivity Feature (Connected/Smart-enabled and Non-connected), By End-User (Residential Settings, Hospitality Settings, Healthcare Facilities, & Educational Institutions), By Distribution Channel (Specialty Stores, Hypermarkets & Supermarkets, & Others), and Regional Forecast, 2026-2034