INSTANT HOT WATER FOR LARGER HOMES:This indoor propane (LPG) tankless water heater delivers instant hot water on demand with a powerful 4.3 GPM flow rate and 102,000 BTU heating capacity, providing endless hot water for 3–4 fixtures simultaneously. Ideal for showers, kitchens, and bathrooms in larger residential homes. INTELLIGENT CONSTANT TEMPERATURE CONTROL:Equipped with advanced intelligent temperature regulation and Constant Temperature PLUS technology, this propane tankless water heater automatically adjusts the air-fuel ratio to maintain stable water temperature within ±1℉, even when multiple outlets are used at the same time, helping prevent sudden temperature fluctuations and reducing the risk of scalding. HIGH-EFFICIENCY PURE COPPER HEAT EXCHANGER:Constructed with a 100% pure copper heat exchanger, this indoor propane water heater delivers up to 95% thermal efficiency, minimizes heat loss, provides hot water within seconds, and ensures reliable, long-lasting performance. MULTIPLE SAFETY & ANTI-FREEZE PROTECTIONS FOR INDOOR USE:Designed for indoor installation, this tankless propane water heater features overheat protection, flame failure protection, anti-dry combustion, dual gas solenoid valves, leak detection, and automatic freeze protection with built-in heating modules that activate below 39°F (4°C) to ensure safe and stable winter operation. COMPACT WALL-MOUNTED DESIGN & EASY INSTALLATION:Featuring a compact, space-saving wall-mounted design (21.3″H × 13.7″W × 6.8″D), this indoor tankless propane water heater supports standard 3/4″ NPT water and gas connections, 3″ vent, and a UL-approved 120V power supply, making it suitable for apartments, condos, and residential homes with propane supply systems. This propane gas tankless water heater delivers high performance with 4.3 GPM flow rate and 102,000 BTU, supporting 3–4 water outlets simultaneously. It is ideal for households using propane (LPG) and needing higher hot water capacity. Built with a pure copper tank and intelligent constant temperature control, it ensures efficient heating and stable water temperature. The 3/4" NPT connector allows quick and secure installation. Compact yet powerful, this energy-efficient indoor tankless water heater provides reliable, on-demand hot water for modern homes using propane gas.